S-3ASR

S-3ASR 1 d119199ds3asr.htm S-3ASR S-3ASR

As filed with the Securities and Exchange Commission on July 27, 2026

Registration No. 333-

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-3

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

DBV TECHNOLOGIES S.A.

(Exact name of registrant as specified in its charter)

France

Not applicable

(State or other jurisdiction of

incorporation or organization)

(I.R.S. Employer

Identification Number)

107 avenue de la République

92320 Châtillon France

+33 1 55 42 78 78

(Address, including zip code, and telephone number, including area code of registrant’s principal executive offices)

Michele Robertson

DBV Technologies Inc.

10 Independence Boulevard

Suite 302

Warren, New Jersey 07059

+1 908-679-5200

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

Richard Segal

Darah Protas

Cooley LLP

55 Hudson Yards

New York, New York 10001

+1 212 479 6000

Arnaud Duhamel

Gide Loyrette Nouel A.A.R.P.I.

15 rue de Laborde

75008 Paris France

+33 1 40 75 00 00

From time to time after the effective date of this Registration Statement

(Approximate date of commencement of proposed sale to the public)

APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: From time to time after the effective date of this registration statement.

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. ☐

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. ☒

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box. ☒

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box. ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.


Large accelerated filer	☐	Accelerated filer	☐
Non-accelerated filer	☒	Smaller reporting company	☒
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

The registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment that specifically states that this registration statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act or until the registration statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to said Section 8(a), may determine.

EXPLANATORY NOTE

This registration statement contains:

•

a base prospectus, which covers the offering, issuance and sale by us and/or selling securityholders of the securities identified therein from time to time in one or more offerings; and

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a sales agreement prospectus supplement, which covers the offering, issuance and sale by us of up to a maximum aggregate offering price of $150,000,000 of our American Depositary Shares, or ADSs, each ADS representing five ordinary shares of nominal value €0.10 each, that may be issued and sold under the Sales Agreement, dated September 5, 2025, between us and Citizens JMP Securities, LLC, $85,154,964 of which ADSs were previously registered pursuant to a prospectus supplement, filed with the Securities and Exchange Commission, or SEC, on September 5, 2025, to the Registration Statement on Form S-3 (File No. 333-271166) that was filed with the SEC on April 6, 2023 and expired on April 17, 2026, or Prior Registration Statement, but have not been sold, and which are hereby registered under this registration statement.

The base prospectus immediately follows this explanatory note. The specific terms of any securities to be offered pursuant to the base prospectus will be specified in one or more prospectus supplements to the base prospectus. The sales agreement prospectus supplement immediately follows the base prospectus.

PROSPECTUS

LOGO

Ordinary Shares

American Depositary Shares representing Ordinary Shares

Warrants

From time to time, we or any selling securityholders may offer and sell any combination of the securities described in this prospectus and any prospectus supplement, either individually or in combination with other securities. We or any selling securityholder may also offer ordinary shares or American Depositary Shares representing ordinary shares, or ADSs, upon the exercise of the warrants.

We or any selling securityholder may offer and sell these securities directly to investors, through agents designated from time to time or to or through underwriters or dealers, on a continuous or delayed basis. For additional information on the methods of sale, you should refer to the section titled “Plan of Distribution” in this prospectus and in the applicable prospectus supplement. If any underwriters or agents are involved in the sale of our securities with respect to which this prospectus is being delivered, the names of such underwriters or agents and any applicable fees, commissions or discounts and over-allotment options will be set forth in a prospectus supplement. The price to the public of such securities and the net proceeds that we expect to receive from such sale will also be set forth in a prospectus supplement. Unless otherwise set forth in a prospectus supplement, we will not receive any proceeds from the sale of securities by selling securityholders.

Our ADSs representing our ordinary shares are listed on the Nasdaq Capital Market, or Nasdaq, under the symbol “DBVT.” On July 23, 2026, the last reported sale price of our ADSs on Nasdaq was $13.86 per ADS. Our ordinary shares are traded on Euronext Paris under the symbol “DBV.” On July 23, 2026, the last reported sale price of the ordinary shares on Euronext Paris was €2.374 per share. There is currently no market through which warrants may be sold and purchasers may not be able to resell warrants purchased under this prospectus. This may affect the pricing of any warrants in the secondary market, the transparency and availability of trading prices, the liquidity of the warrants and the extent of issuer regulation. Prospective purchasers of our securities are urged to obtain current information as to the market prices of our securities, where applicable.

This prospectus describes the general terms of these securities and the general manner in which these securities will be offered. We will provide you with the specific terms of any offering in one or more supplements to this prospectus. The prospectus supplements will also describe the specific manner in which these securities will be offered and may also supplement, update or amend information contained in this document. You should read this prospectus and any prospectus supplement, as well as any documents incorporated by reference into this prospectus or any prospectus supplement, carefully before you invest.

Investing in our securities involves a high degree of risk. You should review carefully the risks and uncertainties described under the heading “Risk Factors” on page 6 of this prospectus and any similar section contained in the applicable prospectus supplement and any related free writing prospectus we have authorized for use in connection with a specific offering, and under similar headings in the other documents that are incorporated by reference into this prospectus.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.

The date of this prospectus is July 27, 2026.

TABLE OF CONTENTS


	Page
ABOUT THIS PROSPECTUS		1
PROSPECTUS SUMMARY		3
RISK FACTORS		6
SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS		7
USE OF PROCEEDS		9
SELLING SECURITYHOLDERS		10
PLAN OF DISTRIBUTION		11
DESCRIPTION OF SHARE CAPITAL AND BY-LAWS		13
DESCRIPTION OF AMERICAN DEPOSITARY SHARES		34
DESCRIPTION OF WARRANTS		45
LIMITATIONS AFFECTING SHAREHOLDERS OF A FRENCH COMPANY		46
ENFORCEMENT OF CIVIL LIABILITIES		48
TAXATION		49
LEGAL MATTERS		49
EXPERTS		49
WHERE YOU CAN FIND MORE INFORMATION		50
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE		51

ABOUT THIS PROSPECTUS

This prospectus is part of an automatic shelf registration statement on Form S-3 that we filed with the U.S. Securities and Exchange Commission, or the SEC, as a “well-known seasoned issuer” as defined in Rule 405 under the Securities Act of 1933, as amended, or the Securities Act. Under this shelf registration statement, we or selling securityholders may, from time to time, offer and sell, either individually or in combination, in one or more offerings, any combination of the securities described in this prospectus. There is no limit on the aggregate amount of the securities that we or selling securityholders may offer pursuant to the registration statement of which this prospectus is a part.

This prospectus provides you with a general description of the securities we or selling securityholders may offer. Each time we or selling securityholders offer securities under this prospectus, we will provide a prospectus supplement that will contain more specific information about the terms of that offering, including the specific amounts, prices and terms of the securities offered. The prospectus supplement may also add to, update or change information contained in this prospectus. We may also authorize one or more free writing prospectuses to be provided to you that may contain material information relating to these offerings. The prospectus supplement and any related free writing prospectus that we may authorize to be provided to you may also add, update or change any of the information contained in this prospectus or in the documents that we have incorporated by reference into this prospectus. Accordingly, to the extent inconsistent, information contained in this prospectus is superseded by the information in any prospectus supplement. You should carefully read this prospectus, any applicable prospectus supplement and any related free writing prospectus we have authorized for use in connection with a specific offering, together with the information incorporated herein by reference as described under the heading “Incorporation of Certain Information by Reference,” before investing in any of the securities being offered.

THIS PROSPECTUS MAY NOT BE USED TO CONSUMMATE A SALE OF SECURITIES UNLESS IT IS ACCOMPANIED BY A PROSPECTUS SUPPLEMENT.

Neither we nor any agent, underwriter or dealer has authorized any other person to provide you with any information or to make any representations other than those contained in, or incorporated by reference into, this prospectus, any related prospectus supplement and any free writing prospectuses prepared by or on behalf of us or to which we have referred you. We take no responsibility for, and can provide no assurance as to the reliability of, any other information that others may give you. You should assume that the information appearing in this prospectus, any related prospectus supplement and the documents incorporated by reference into this prospectus, any related prospectus supplement and in any free writing prospectuses that we may authorize for use in connection with this offering, is accurate only as of the date of those respective documents. Our business, financial condition, results of operations and prospects may have changed since those dates. You should read this prospectus, any related prospectus supplement, the documents incorporated by reference into this prospectus, and any free writing prospectuses that we may authorize for use in connection with this offering, in their entirety before making an investment decision. You should also read and consider the information in the documents to which we have referred you in the sections of this prospectus captioned “Where You Can Find More Information” and “Incorporation of Certain Information by Reference.”

We are not making an offer to sell or soliciting an offer to buy our securities in any jurisdiction in which an offer or solicitation is not authorized or in which the person making that offer or solicitation is not qualified to do so or to anyone to whom it is unlawful to make an offer or solicitation. We are offering to sell, and seeking offers to buy, our securities only in jurisdictions where offers and sales are permitted. The distribution of this prospectus and any related prospectus supplement or free writing prospectuses and the offering of our securities in certain jurisdictions may be restricted by law. Persons outside the United States who come into possession of this prospectus and any related prospectus supplement or free writing prospectuses must inform themselves about, and observe any restrictions relating to, the offering of our securities and the distribution of this prospectus and any related prospectus supplement outside the United States. This prospectus and any related prospectus

supplement or free writing prospectuses does not constitute, and may not be used in connection with, an offer to sell, or a solicitation of an offer to buy, any securities offered by this prospectus and any related prospectus supplement by any person in any jurisdiction in which it is unlawful for such person to make such an offer or solicitation.

We obtained the industry and market data in this prospectus, including the information incorporated by reference herein, from our own research as well as from industry and general publications, surveys and studies conducted by third parties. These data involve a number of assumptions and limitations, and you are cautioned not to give undue weight to such estimates. In addition, projections, assumptions and estimates of our future performance and the future performance of the industry in which we operate is necessarily subject to a high degree of uncertainty and risk due to a variety of factors, including those described in “Risk Factors” and elsewhere in this prospectus, any related prospectus supplement, documents incorporated by reference into this prospectus and any related or free writing prospectuses. These and other factors could cause results to differ materially from those expressed in the estimates made by the independent parties and by us.

This prospectus, any related prospectus supplement or any related free writing prospectuses, including the information incorporated by reference into this prospectus, any related prospectus supplement or any related free writing prospectuses, include trademarks, service marks and trade names owned by us or others. All trademarks, service marks and trade names included or incorporated by reference in this prospectus, any related prospectus supplement or any related free writing prospectuses are the property of their respective owners.

Unless otherwise indicated or the context otherwise requires, references in this prospectus to “DBV,” “the company,” “our company,” “we,” “us” and “our” refer to DBV Technologies S.A. and our consolidated subsidiaries. All references in this prospectus to “$,” “US$,” “U.S.$,” “U.S. dollars,” “dollars” and “USD” mean U.S. dollars and all references to “€” and “euros,” mean euros, unless otherwise noted. Throughout this prospectus, references to ADSs mean ADSs or ordinary shares represented by ADSs, as the case may be.

For investors outside the United States: We have not done anything that would permit the offering or possession or distribution of this prospectus in any jurisdiction where action for that purpose is required, other than in the United States. Persons outside the United States who come into possession of this prospectus must inform themselves about, and observe any restrictions relating to, the offering of the securities described herein and the distribution of this prospectus outside the United States.

PROSPECTUS SUMMARY

The following summary highlights selected information from this prospectus and does not contain all of the information that you need to consider in making your investment decision. You should carefully read the entire prospectus, the applicable prospectus supplement and any related free writing prospectus, including the risks of investing in our securities discussed under the heading “Risk Factors” contained in the applicable prospectus supplement and any related free writing prospectus, and under similar headings in the other documents that are incorporated by reference into this prospectus. You should also carefully read the information incorporated by reference into this prospectus, including our financial statements, and the exhibits to the registration statement of which this prospectus is a part.

Overview

We are a late stage specialty biopharmaceutical company focused on changing the field of immunotherapy by developing a novel technology platform called Viaskin. Our therapeutic approach is based on epicutaneous immunotherapy, our proprietary method of delivering biologically active compounds to the immune system through intact skin using Viaskin, an epicutaneous patch (i.e., a skin patch). We have generated significant data demonstrating that Viaskin’s mechanism of action is novel and differentiated,. Viaskin targets specialized antigen-presenting immune cells in the skin, called Langerhans cells, that capture the antigen that accumulates in the outer layer of the skin, and then migrate to the skin-draining lymph nodes in order to activate the immune system without passage of the antigen into the bloodstream, minimizing systemic exposure in the body. We are advancing this unique technology to treat children suffering from food allergies, for whom safety is paramount, since the introduction of the offending allergen into their bloodstream can cause severe or life-threatening allergic reactions, such as anaphylactic shock. We believe Viaskin may offer convenient, self-administered, non-invasive immunotherapy to patients, if approved.

Our most advanced product candidate is the Viaskin Peanut patch, evaluated as a potential immunotherapy for children with peanut allergy in twelve clinical trials, including four Phase 2 trials and five completed Phase 3 trials. We are advancing two separate Viaskin Peanut product candidates in parallel to support two potential BLAs in two distinct age groups: one in toddlers ages one through three with the original, or square, patch, and one in children ages four through seven with the modified, or circular, patch.

Corporate Information

Our legal and commercial name is DBV Technologies S.A. We were incorporated as a société par actions simplifiée under the laws of the French Republic on March 29, 2002 for a period of 99 years and subsequently converted on March 13, 2003 into a société anonyme, or S.A. We are registered at the Nanterre Commerce and Companies Register under the number 441 772 522. Our principal executive offices are located at 107 avenue de la République, 92320 Châtillon, France and our telephone number is +33 1 55 42 78 78. Our agent for service of process in the United States is DBV Technologies Inc. We maintain a corporate website at www.dbv-technologies.com. Information contained on, or that can be accessed through, our website does not constitute a part of this prospectus. We have included our website address in this prospectus solely as an inactive textual reference.

been trading on Euronext Paris under the symbol “DBV” since March 28, 2012. There is currently no market through which our warrants may be sold and purchasers may not be able to resell the warrants. This may affect the pricing of any warrants in the secondary market, the transparency and availability of trading prices, the liquidity of the warrants and the extent of issuer regulation. Prospective purchasers of our securities are urged to obtain current information as to the market prices of our securities, where applicable.

Implications of Being a Smaller Reporting Company

We are a “smaller reporting company” as defined in the Securities Exchange Act of 1934, as amended, or the Exchange Act. We may take advantage of certain scaled disclosures available to smaller reporting companies and will be able to take advantage of these scaled down disclosures for so long as (i) our voting and non-voting ordinary shares held by non-affiliates are less than $250.0 million measured as of June 30th of such fiscal year or (ii) our annual revenue is less than $100.0 million during the most recently completed fiscal year and our voting and non-voting ordinary shares held by non-affiliates is less than $700.0 million measured as of June 30th of such fiscal year. Based on the aggregate worldwide market value of our voting and non-voting common equity held by our non-affiliates as of June 30, 2026, we will be deemed a “large accelerated filer” as of the end of our fiscal year 2026. We will therefore cease being a smaller reporting company on December 31, 2026.

The Securities We May Offer

We or selling securityholders may offer ordinary shares, ADSs representing our ordinary shares, or various series of warrants from time to time in one or more offerings under this prospectus, together with any applicable prospectus supplement and any related free writing prospectus, at prices and on terms to be determined by market conditions at the time of the relevant offering. This prospectus provides you with a general description of the securities we or selling securityholders may offer. Each time we or selling securityholders offer a type or series of securities under this prospectus, we will provide a prospectus supplement that will describe the specific amounts, prices and other important terms of the securities, including, to the extent applicable:

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designation or classification;

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aggregate principal amount or aggregate offering price;

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maturity, if applicable;

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rates and times of payment of interest or dividends, if any;

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redemption, conversion or sinking fund terms, if any;

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voting or other rights, if any; and

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conversion or exercise prices, if any.

The prospectus supplement and any related free writing prospectus that we may authorize to be provided to you may also add, update or change information contained in this prospectus or in documents we have incorporated by reference into this prospectus. However, no prospectus supplement or free writing prospectus will offer a security that is not registered and described in this prospectus at the time of the effectiveness of the registration statement of which this prospectus is a part.

We or selling securityholders may sell the securities directly to investors or through underwriters, dealers or agents. We or selling securityholders, and our or their underwriters or agents, reserve the right to accept or reject all or part of any proposed purchase of securities. If we or selling securityholders do offer securities through underwriters or agents, we will include in the applicable prospectus supplement:

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the names of those underwriters or agents;

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applicable fees and commissions to be paid to them;

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details regarding over-allotment options, if any; and

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the estimated net proceeds to us.

This prospectus may not be used to consummate a sale of securities unless it is accompanied by a prospectus supplement.

RISK FACTORS

Investing in our securities involves a high degree of risk. You should carefully review the risks and uncertainties described under the heading “Risk Factors” contained in the applicable prospectus supplement and any related free writing prospectus, and under similar headings in our most recently filed Annual Report on Form 10-K and in our most recent Quarterly Report on Form 10-Q, as well as any amendments thereto reflected in our subsequent filings with the SEC, which are incorporated by reference into this prospectus, before deciding whether to purchase any of the securities being registered pursuant to the registration statement of which this prospectus is a part. Each of the risk factors could adversely affect our business, operating results, financial condition and cash flows, as well as adversely affect the value of an investment in our securities, and the occurrence of any of these risks might cause you to lose all or part of your investment. Additional risks not presently known to us or that we currently believe are immaterial may also significantly impair our business operations.

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This prospectus and the documents incorporated by reference herein contain forward-looking statements. These are based on our management’s current beliefs, expectations and assumptions about future events, conditions and results and on information currently available to us. Discussions containing these forward-looking statements may be found, among other places, in the sections entitled “Business,” “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained in the documents incorporated by reference herein.

Any statements in this prospectus, or incorporated herein, about our expectations, beliefs, plans, objectives, assumptions or future events or performance are not historical facts and are forward-looking statements. Within the meaning of Section 27A of the Securities Act of 1933, as amended, or the Securities Act, and Section 21E of the Exchange Act, these forward-looking statements include statements regarding:

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our expectations regarding the timing or likelihood of regulatory filings and approvals, including with respect to our anticipated re-submission of a Biologics License Application, or BLA, for Viaskin Peanut patch to the U.S. Food and Drug Administration, or FDA;

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our expectations with respect to an actionable regulatory pathway, including an Accelerated Approval pathway, for toddlers ages 1-3 years-old for the Viaskin Peanut patch;

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our expectations regarding initiation of the confirmatory effectiveness study for Viaskin Peanut patch in 1 – 3 years-old;

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anticipated support for the BLA re-submission for the Viaskin Peanut patch to FDA;

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the timing and anticipated results of interactions with regulatory agencies;

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the design, initiation, timing, progress and results of our pre-clinical studies and clinical trials, and our research and development programs;

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the sufficiency of existing capital resources;

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our business model and our other strategic plans for our business, product candidates and technology;

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our ability to manufacture clinical and commercial supplies of the Viaskin Peanut patch and/or our other product candidates, if approved, and comply with regulatory requirements related to the manufacturing of our product candidates;

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the ability of our sole contract manufacturer for Viaskin Peanut patches to successfully remediate Good Manufacturing Practice deficiencies in response to FDA warning letters;

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our ability to build our own sales and marketing capabilities, or seek collaborative partners, to commercialize the Viaskin Peanut patch and/or our other product candidates, if approved;

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the commercialization of our product candidates, if approved;

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our expectations regarding the potential market size and the size of the patient populations for the Viaskin Peanut patch and/or our other product candidates, if approved, and our ability to serve such markets;

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the pricing and reimbursement of our product candidates, if approved;

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the rate and degree of market acceptance of the Viaskin Peanut patch and/or our other product candidates, if approved, by physicians, patients, third-party payors and others in the medical community;

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our ability to advance product candidates into, and successfully complete, clinical trials;

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the scope of protection we are able to establish and maintain for intellectual property rights covering our product candidates and technology;

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estimates of our expenses, future revenues, capital requirements and our needs for additional financing;

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the potential benefits of strategic collaboration agreements and our ability to enter into strategic arrangements;

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our ability to maintain and establish collaborations or obtain additional funding;

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our future financial performance;

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developments relating to our competitors and our industry, including competing therapies;

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plans and expectations with respect to use of proceeds from any offerings made pursuant to this prospectus combined with our current operating capital, to fund operations; and

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other risks and uncertainties, including those listed under the caption “Risk Factors” in this prospectus and the documents incorporated by reference herein.

In some cases, you can identify forward-looking statements by the words “may,” “might,” “can,” “will,” “to be,” “could,” “would,” “should,” “expect,” “intend,” “plan,” “objective,” “anticipate,” “believe,” “estimate,” “predict,” “project,” “potential,” “likely,” “continue” and “ongoing,” or the negative of these terms, or other comparable terminology intended to identify statements about the future, although not all forward-looking statements contain these words. These statements involve known and unknown risks, uncertainties and other factors that may cause our actual results, levels of activity, performance or achievements to be materially different from the information expressed or implied by these forward-looking statements.

You should refer to the “Risk Factors” section contained in this prospectus, any applicable prospectus supplement and any related free writing prospectus, in our Annual Report on Form 10-K for the year ended December 31, 2025, as amended and supplemented, or Annual Report, as such risk factors may be amended, supplemented or superseded from time to time by other reports we file with the SEC, including subsequent Annual Reports on Form 10-K and quarterly reports on Form 10-Q, and any similarly captioned section in any other document that is incorporated by reference into this prospectus for a discussion of important factors that may cause our actual results to differ materially from those expressed or implied by our forward-looking statements. As a result of these factors, we cannot assure you that the forward-looking statements contained or incorporated by reference in this prospectus, any applicable prospectus supplement and any related free writing prospectus will prove to be accurate, and you should not place undue reliance on these forward-looking statements. Furthermore, if our forward-looking statements prove to be inaccurate, the inaccuracy may be material. In light of the significant uncertainties in these forward-looking statements, you should not regard these statements as a representation or warranty by us or any other person that we will achieve our objectives and plans in any specified time frame, or at all. We undertake no obligation to publicly update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

In addition, statements that “we believe” and similar statements reflect our beliefs and opinions on the relevant subject. These statements are based upon information available to us as of the date of this prospectus, and while we believe such information forms a reasonable basis for such statements, such information may be limited or incomplete. Our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of, all potentially available relevant information. These statements are inherently uncertain and investors are cautioned not to unduly rely upon these statements

You should read this prospectus, any applicable prospectus supplement, any free writing prospectuses that we may authorize for use in connection with an offering and the documents that we reference in this prospectus and have filed as exhibits to the registration statement of which this prospectus is a part completely and with the understanding that our actual future results may be materially different from what we expect. We qualify all of our forward-looking statements by these cautionary statements.

USE OF PROCEEDS

Unless otherwise set forth in a prospectus supplement, we currently intend to use the net proceeds of any offering of securities for working capital and other general corporate purposes. Accordingly, we will have significant discretion in the use of any net proceeds. We may provide additional information on the use of the net proceeds from the sale of the offered securities in an applicable prospectus supplement relating to the offered securities.

Unless the applicable prospectus supplement provides otherwise, we will not receive any of the proceeds from the sale of securities by selling securityholders.

SELLING SECURITYHOLDERS

Selling securityholders are persons or entities that, directly or indirectly, have acquired or will from time to time acquire from us, our securities. Such selling securityholders may be parties to registration rights agreements with us, or we otherwise may have agreed or will agree to register their securities for resale. The initial purchasers of our securities, as well as their transferees, pledges, donees or successors, all of whom we refer to as “selling securityholders,” may from time to time offer and sell our securities pursuant to this prospectus and any applicable prospectus supplement.

The applicable prospectus supplement will set forth the name of each of the selling securityholders and the number of securities beneficially owned by such selling securityholder that are covered by such prospectus supplement. The applicable prospectus supplement will also disclose whether any of the selling securityholders has held any position or office with, has been employed by or otherwise has had a material relationship with us during the three years prior to the date of the applicable prospectus supplement.

PLAN OF DISTRIBUTION

We or selling securityholders may sell or otherwise offer our securities described herein:

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through underwriters or dealers;

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through agents;

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directly to purchasers; or

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through a combination of any of these methods of sale.

The distribution of securities may be carried out, from time to time, in one or more transactions, including:

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block transactions and transactions on Nasdaq or any other organized market where the securities may be traded;

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purchases by a broker-dealer as principal and resale by the broker-dealer for its own account pursuant to a prospectus supplement;

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ordinary brokerage transactions and transactions in which a broker-dealer solicits purchasers;

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sales “at the market” to or through a market maker or into an existing trading market, on an exchange or otherwise; or

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sales in other ways not involving market makers or established trading markets, including direct sales to purchasers.

A prospectus supplement or supplements (and any related free writing prospectus that we may authorize to be provided to you) will describe the terms of the offering of the securities, including, to the extent applicable:

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the name or names of any underwriters, dealers or agents;

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the method of distribution;

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the public offering price or purchase price and the proceeds to us from that sale;

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the expenses of the offering;

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any commissions to be allowed or paid to the underwriters, dealers or agents;

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all other items constituting underwriting compensation and the commissions to be allowed or paid to dealers, if any; and

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any other information regarding the distribution of the securities that we believe to be material.

Underwriters may offer and sell the securities at a fixed price or prices, which may be changed, or from time to time at market prices prevailing at the time of sale, at prices related to prevailing market prices or at negotiated prices. We or selling securityholders may, from time to time, authorize agents acting on a best or reasonable efforts basis as our agents to solicit or receive offers to purchase the securities upon the terms and conditions as are set forth in the applicable prospectus supplement. In connection with the sale of securities, underwriters or agents may be deemed to have received compensation from us or selling securityholders in the form of underwriting commissions and may also receive commissions from purchasers of securities for whom they may act as agent. Underwriters may sell securities to or through dealers, and dealers may receive compensation in the form of commissions from the underwriters and/or commissions from the purchasers for whom they may act as agent.

Underwriters, dealers and agents who participate in the distribution of securities and their controlling persons may be entitled, under agreements that may be entered into with us to indemnification by us against certain liabilities, including liabilities under the Securities Act, or to contribution with respect to payments that

the underwriters, dealers or agents and their controlling persons may be required to make in respect of those liabilities.

We may also make direct sales through subscription rights distributed to our existing shareholders on a pro rata basis, which may or may not be transferable. In any distribution of subscription rights to our shareholders, if all of the underlying securities are not subscribed for, we may then sell the unsubscribed securities directly to third parties or may engage the services of one or more underwriters, dealers or agents, including standby underwriters, to sell the unsubscribed securities to third parties.

Certain persons participating in an offering may engage in over-allotment, stabilizing transactions, short-covering transactions and penalty bids in accordance with Regulation M under the Exchange Act that stabilize, maintain or otherwise affect the price of the offered securities. If any such activities will occur, they will be described in the applicable prospectus supplement.

DESCRIPTION OF SHARE CAPITAL AND BY-LAWS

The following description of our share capital summarizes certain provisions of our by-laws and relevant provisions of French law. Such summaries do not purport to be complete and are subject to, and are qualified in their entirety by reference to, our by-laws, a copy of which has been filed with the SEC, and to the applicable provisions of French law. We encourage you to read our by-laws and the applicable provisions of French law for additional information.

Holders of ADSs will be able to exercise their rights with respect to the ordinary shares underlying the ADSs only in accordance with the terms of the deposit agreement. See the description under the caption “American Depositary Shares.”

General

As of July 23, 2026, our outstanding share capital, including treasury shares, consisted of a total of 296,085,697 issued ordinary shares, fully paid and with a nominal value €0.10 per share. We have no preferred shares outstanding.

Under French law, our by-laws set forth only our issued and outstanding share capital as of the date of the by-laws. Our fully diluted share capital represents all issued and outstanding shares, as well as all potential shares which may be issued upon exercise of outstanding employee warrants, employee share options and non-employee warrants, as approved by our shareholders and granted by our board of directors.

Key Provisions of Our By-laws and French Law Affecting Our Ordinary Shares

The description below reflects the terms of our by-laws, and summarizes the material rights of holders of our ordinary shares under French law. Please note that this is only a summary and is not intended to be exhaustive. For further information, please refer to the full version of our by-laws.

Corporate Purpose (Article 4 of the by-laws)

Our corporate purpose in France and abroad includes:

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the development of any innovative medical product, and in particular any drugs or diagnostic, or treatment products;

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the study, research, development, industrial manufacture, and marketing of said products; and

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the use and the development of any patents or any licenses relating to these products, and generally speaking any commercial, investment or real estate, financial or other transactions that are directly or indirectly related to the corporate purpose, in whole or in part, or any other similar or related purpose, and that may promote our operation and commercial development.

Directors

Directors’ Designation (article 10 of the by-laws). Directors are designated at a shareholders’ ordinary general meeting, by a simple majority vote of the shareholders present and voting at the meeting in person or by proxy, for a period of three years that expires at the end of the shareholders’ general meeting convened to approve the financial statements for the past fiscal year and held in the year during which the respective director’s term expires.

Vacancies on the Board of Directors. Under French law, vacancies on the board of directors resulting from death or a resignation, provided that at least three directors remain in office, may be filled by a majority of the remaining directors pending ratification by the shareholders at the next shareholders’ meeting.

Quorum and Voting (Article 11 of the by-laws). The board of directors can only deliberate if at least half of the directors attend the meeting in the manners provided for in our by-laws. French law and the rules of procedure of the board allow directors to attend meetings of the board of directors in person or, to the extent permitted by applicable law, by videoconference or other telecommunications arrangements. Decisions of the board of directors are taken by the majority of the voting rights held by the directors present or represented.

Written consultations (article 11 of the by-laws). The board of directors may also make certain decisions within its remit by virtue of a written consultation, in accordance with the laws and regulations. In the event of a written consultation, the Chairman of the board of directors must send, by any means, including electronically, to each director the text of the proposed decisions as well as any documents required for information purposes. Any director may object to the use of written consultation for the adoption of a decision, by informing the Chairman by e-mail within two working days of the date of dispatch of the draft decisions. Directors have a period of five calendar days from the date on which the draft decisions are sent to cast their vote in writing, responses are sent by e-mail to the attention of the Chairman of the board of directors. The board of directors may only validly deliberate on a written consultation if at least half of its members have replied within the time limit indicated above and the decisions are taken by a majority of the votes. Minutes of written consultations shall be drawn up and signed by the Chairman; they must then be sent along with each director’s response to us and retained in the same way as the minutes of board meetings.

Directors’ Voting Powers on Proposal, Arrangement or Contract in which any Director Is Materially Interested. Under French law, any agreement entered into (directly or through an intermediary) between us and any director that is not entered into (1) in the ordinary course of our business and (2) upon standard market terms is subject to the prior authorization of the board of directors (it being specified that the interested director cannot vote on such decision). The same provision applies to agreements between us and another company if one of our directors is the owner or a general partner, manager, director, general manager or member of the executive or supervisory board of the other company, as well as to agreements in which one of our directors has an indirect interest.

Directors’ Compensation. The aggregate amount of the compensation (rémunération de l’activité) of the board of directors is determined at the shareholders’ annual ordinary general meeting, on the basis of a submission of the board of directors of proposed compensation for the board of directors, following the recommendation of the compensation committee (comité des rémunérations) which is comprised of four directors, of which at least two are independent, to the board of directors. The board of directors then divides this aggregate amount among some or all of its members by a simple majority vote, on the basis of a proposal of the compensation committee.

In addition, the board of directors may grant exceptional compensation (rémunérations exceptionnelles) to individual directors on a case-by-case basis for special and temporary assignments. The board of directors may also authorize the reimbursement of reasonable travel and accommodation expenses, as well as other expenses incurred by directors in the corporate interest.

Board of Directors’ Borrowing Powers (article 12 of the by-laws). There are currently no limits imposed on the amounts of loans or borrowings that the board of directors may approve.

Directors’ Age Limits (Article 10 of the by-laws). The number of directors who are more than 80 years old may not exceed one-third of the directors in office.

Rights, Preferences and Restrictions Attaching to Ordinary Shares

Dividends (Article 37 of the by-laws). We may only distribute dividends out of our “distributable profits,” plus any amounts held in our reserves that the shareholders decide to make available for distribution, other than those reserves that are specifically required by law.

“Distributable Profits” consist of our unconsolidated net profit in each fiscal year, as increased or reduced by any profit or loss carried forward from prior years, less any contributions to the reserve accounts pursuant to French law (see below).

Legal Reserve. Pursuant to French law, we must allocate at least 5% of our unconsolidated net profit for each year to our legal reserve fund before dividends may be paid with respect to that year. Funds must be allocated until the amount in the legal reserve is equal to 10% of the aggregate par value of our issued and outstanding share capital. This restriction on the payment of dividends also applies to our French subsidiary on an unconsolidated basis.

Approval of Dividends. Pursuant to French law, our board of directors may propose a dividend for approval by the shareholders at the annual ordinary general meeting.

Upon recommendation of our board of directors, our shareholders may decide to allocate all or part of any distributable profits to special or general reserves, to carry them forward to the next fiscal year as retained earnings or to allocate them to the shareholders as dividends. However, dividends may not be distributed when our net assets are or would become as a result of such distribution lower than the amount of the share capital plus the amount of the legal reserves which, under French law, may not be distributed to shareholders.

Our board of directors may distribute interim dividends after the end of the fiscal year but before the approval of the financial statements for the relevant fiscal year when the interim balance sheet, established during such year and certified by an auditor, reflects that we have earned distributable profits since the close of the last financial year, after recognizing the necessary depreciation and provisions and after deducting prior losses, if any, and the sums to be allocated to reserves, as required by law or the by-laws, and including any retained earnings. The amount of such interim dividends may not exceed the amount of the profit so defined.

Distribution of Dividends. Dividends are distributed to shareholders pro rata according to their respective holdings of shares. In the case of interim dividends, distributions are made to shareholders on the date set by our board of directors during the meeting in which the distribution of interim dividends is approved. The actual dividend payment date is decided by the shareholders at an ordinary general shareholders’ meeting or by our board of directors in the absence of such a decision by the shareholders. Shareholders that own shares on the actual payment date are entitled to the dividend.

Dividends may be paid in cash or, if the shareholders’ meeting so decides, in kind, provided that all shareholders receive a whole number of assets of the same nature paid in lieu of cash.

Timing of Payment. Pursuant to French law, dividends must be paid within a maximum of nine months after the close of the relevant fiscal year, unless extended by court order. Dividends not claimed within five years after the payment date shall be deemed to expire and revert to the French State.

Voting Rights (Article 23 of the by-laws). Each share shall entitle its holder to vote and be represented in the shareholders’ meetings in accordance with the provisions of French law and of our by-laws. Ownership of one share implies, ipso jure, adherence to our by-laws and the decisions of the shareholders’ meeting.

In general, each shareholder is entitled to one vote per share at any general shareholders’ meeting. As of April 2016, double voting rights are automatically granted to shares registered under a shareholder’s name for at least two years, unless the by-laws are modified in order to provide otherwise. Our by-laws (Article 23 of the by-laws) prohibit the use of double voting rights following the modification of the provisions of Article L. 225-123 of the French Commercial Code. As a consequence, each shareholder is entitled to one vote per share at any general shareholders’ meeting.

Under French law, treasury shares or shares held by entities controlled by us are not entitled to voting rights and do not count for quorum purposes.

Rights to Share in Our Profit. Each ordinary share entitles its holder to a portion of the corporate profits and assets proportional to the amount of share capital represented thereby.

Rights to Share in the Surplus in the Event of Liquidation (Article 38 of the by-laws). If we are liquidated, any assets remaining after payment of the debts, liquidation expenses and all of the remaining obligations will first be used to repay in full the par value of our shares. Any surplus will be distributed among shareholders in proportion to the number of shares respectively held by them, taking into account, where applicable, the rights attached to shares of different classes.

Repurchase and Redemption of Shares. Under French law, we may acquire our own shares for the following purposes only in accordance with the safe harbor exemptions provided by Regulation (EU) 596/2014 of April 16, 2014, as amended, or MAR:

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to decrease our share capital, provided that such a decision is not driven by losses and that a purchase offer is made to all shareholders on a pro rata basis, with the approval of the shareholders at an extraordinary general meeting; in this case, the shares repurchased must be cancelled within one month from the expiry of the purchase offer;

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to meet obligations arising from debt securities that are exchangeable into equity instruments;

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to provide shares for distribution to employees or managers under a profit-sharing, free share or share option plan; in this case the shares repurchased must be distributed within 12 months from their repurchase failing which they must be cancelled; or

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under a buy-back program to be authorized by the shareholders in accordance with the provisions of Article L. 22-10-62 of the French Commercial Code and in accordance with MAR, Commission Delegated Regulation (EU) 2016/1052 of March 8, 2016, and the general regulations of, and market practices accepted by the AMF.

All other purposes, and especially share buy-backs made for external growth operations in pursuance of Article L. 22-10-62 of the French Commercial Code, while not forbidden, must be pursued in strict compliance with market manipulation and insider dealing rules.

Under MAR and in accordance with the general regulations (règlement général) of the AMF, a corporation shall report to the competent authority of the most relevant market in terms of liquidity, no later than by the end of the seventh daily market session following the date of the execution of the transaction, all the transactions relating to the buy-back program, in a detailed form and in an aggregated form. The receiving competent authority shall, upon request, forward the information to the competent authorities of the trading venue on which the shares have been admitted to trading and are traded.

No such repurchase of shares may result in us holding, directly or through a person acting on our behalf, more than 10% of our issued share capital. Shares repurchased by us continue to be deemed “issued” under French law but are not entitled to dividends or voting rights so long as we hold them directly or indirectly, and we may not exercise the preemptive rights attached to them.

Sinking Fund Provisions. Our by-laws do not provide for any sinking fund provisions.

Liability to Further Capital Calls. Shareholders are liable for corporate liabilities only up to the par value of the shares they hold; they are not liable to further capital calls.

Requirements for Holdings Exceeding Certain Percentages. None except as described under the section of this prospectus titled “—Form, Holding and Transfer of Shares—Ownership of Shares by Non-French Persons.”

Actions Necessary to Modify Shareholders’ Rights

Shareholders’ rights may be modified as allowed by French law. Only the extraordinary shareholders’ meeting is authorized to amend any and all provisions of our by-laws. It may not, however, increase shareholder commitments without the prior approval of each shareholder.

Special Voting Rights of Warrant Holders

Under French law, the holders of warrants of the same class (i.e., warrants that were issued at the same time and with the same rights), including founders’ warrants, are entitled to vote as a separate class at a general meeting of that class of warrant holders under certain circumstances, principally in connection with any proposed modification of the terms and conditions of the class of warrants or any proposed issuance of preferred shares or any modification of the rights of any outstanding class or series of preferred shares.

Rules for Admission to and Calling Annual Shareholders’ Meetings and Extraordinary Shareholders’ Meetings

Access to, Participation in and Voting Rights at Shareholders’ Meetings (Articles 20 & 21 of the by-laws). Shareholders’ meetings are composed of all shareholders. Each shareholder has the right to attend the meetings and participate in the discussions (1) personally, or (2) by granting proxy to any individual or legal entity of his choosing; or (3) by sending a proxy to the company without indication of the mandate, or (4) by voting by correspondence, or (5) by videoconference or another means of telecommunication in accordance with applicable laws that allow identification. The board of directors organizes, in accordance with legal and regulatory requirements, the participation and vote of these shareholders at the meeting, assuring, in particular, the effectiveness of the means of identification.

Participation in shareholders’ general meetings, in any form whatsoever, is subject to registration or registration of shares under the conditions and time limits provided for in applicable laws.

The final date for returning voting ballots by correspondence is set by the board of directors and disclosed in the notice of meeting published in the French Journal of Mandatory Statutory Notices (Bulletin des Annonces Légales Obligatoires, or BALO). This date cannot be earlier than three days prior to the meeting.

The shareholder having voted by correspondence will no longer be able to participate directly in the meeting or to be represented. In the case of returning the proxy form and the voting by correspondence form, the proxy form is taken into account, subject to the votes cast in the voting by correspondence form.

Any shareholder may be represented at meetings by any individual or legal entity of his choosing, by means of a proxy form which is addressed to him by us (1) at his request, addressed to us by any means. This request must be received at the registered office at least five days before the date of the meeting; or (2) at our initiative.

The proxy is only valid for a single meeting or for successive meetings convened with the same agenda. It can also be granted for two meetings, one ordinary, the other extraordinary, held on the same day or within a period of fifteen days.

Any shareholder may vote by correspondence by means of a voting form, which is sent by us (1) upon request, addressed in writing (this request must be received at the registered office at least six days before the date of the meeting); or (2) at our initiative; or (3) in appendix to a proxy voting form under the conditions provided for by current laws and requirements. In any case this voting form is available on our website at least 21 days before the date of the meeting.

The voting by correspondence form addressed by a shareholder is only valid for a single meeting or for successive meetings convened with the same agenda.

To better understand the voting rights of the ADSs, you should carefully read the section in this prospectus titled “Description of American Depositary Shares—Voting Rights.”

Notice of Annual Shareholders’ Meetings. Shareholders’ meetings are convened by our board of directors, or, failing that, by the statutory auditors, or by a court appointed agent or liquidator in certain circumstances. Meetings are held at our registered offices or at any other location indicated in the convening notice. A convening notice is published in the BALO at least 35 days prior to a meeting, as well as on our website at least 21 days prior to the meeting. In addition to the particulars related to the company, it indicates, notably, the meeting’s agenda and the draft resolutions that will be presented. The requests for recording of issues or draft resolutions on the agenda must be addressed to the company under the conditions provided for in the current legislation.

Subject to special legal provisions, the meeting notice is sent out at least fifteen days prior to the date of the meeting, by means of a notice inserted both in a legal announcement bulletin of the registered office department and in the BALO. Further, the holders of registered shares for at least a month at the time of the latest of the insertions of the notice of meeting shall be summoned individually, by regular letter (or by registered letter if they request it and include an advance of expenses) sent to their last known address. This notice may also be transmitted by electronic means of telecommunication, in lieu of any such mailing, to any shareholder requesting it beforehand by registered letter with acknowledgment of receipt in accordance with legal and regulatory requirements, specifying his e-mail address. The latter may at any time expressly request by registered letter to the company with acknowledgment of receipt that the aforementioned means of telecommunication should be replaced in the future by a mailing. The Decree No. 2026-94 of 13 February 2026 on the modernization of communication methods with shareholders of certain commercial companies now allows notices of meeting and the prior documentation for general meetings of shareholders of companies listed on a regulated market to be sent electronically to shareholders whose shares are held in registered form. This new rule regarding the notice of meeting and the sending to registered shareholders of the information to be provided prior to the general meeting applies only to general meetings convened as from 1 July 2026. However, for a period of two years from the date of entry into force of the decree, any shareholder already registered in the company’s books on that date may request, by postal mail with acknowledgement of receipt sent to the company no later than 90 days prior to the publication date of the meeting notice, that the prior communications relating to the general meeting be sent by postal mail. This request will apply to all subsequent meetings.

The convening notice must also indicate the conditions under which the shareholders may vote by correspondence and the places and conditions in which they can obtain voting forms by mail.

The convening notice may be addressed, where appropriate, with a proxy form and a voting by correspondence form, under the conditions specified in our by-laws, or with a voting by correspondence form alone, under the conditions specified in our by-laws. When the shareholders’ meeting cannot deliberate due to the lack of the required quorum, the second meeting must be called at least ten days in advance in the same manner as used for the first notice.

Agenda and Conduct of Annual Shareholders’ Meetings. The agenda of the shareholders’ meeting shall appear in the notice to convene the meeting and is set by the author of the notice. The shareholders’ meeting may only deliberate on the items on the agenda except for the removal of directors and the appointment of their successors which may be put to vote by any shareholder during any shareholders’ meeting. One or more shareholders representing a percentage of share capital required by French law (currently at 5%), and acting in accordance with legal requirements and within applicable time limits, may request the inclusion of items or proposed resolutions on the agenda.

Shareholders’ meetings shall be chaired by the Chairman of the board of directors or, in his or her absence, the meeting itself shall elect a Chairman. Vote counting shall be performed by the two members of the meeting who are present and accept such duties, who represent, either on their own behalf or as proxies, the greatest number of votes.

Ordinary Shareholders’ Meeting. Ordinary shareholders’ meetings are those meetings called to make any and all decisions that do not amend our by-laws. An ordinary meeting shall be convened at least once a year within six months of the end of each fiscal year in order to approve the annual and consolidated accounts for the relevant fiscal year or, in case of postponement, within the period established by court order. Upon first notice, the meeting may validly deliberate only if the shareholders present or represented by proxy or voting by mail represent at least one-fifth of the shares entitled to vote. Upon second notice, no quorum is required. Decisions are made by a majority of the votes cast by the shareholders present or represented (by proxy or by mail). The votes cast do not include those attached to shares for which the shareholder did not participate in the vote, abstained, voted blank or for which the vote is otherwise void.

Extraordinary Shareholders’ Meeting. Only an extraordinary shareholders’ meeting is authorized to amend our by-laws. It may not, however, increase shareholder commitments without the approval of each shareholder. Subject to the legal provisions governing share capital increases from reserves, profits or share premiums, the resolutions of the extraordinary meeting shall be valid only if the shareholders present, represented by proxy or voting by mail represent at least one-fourth of all shares entitled to vote upon first notice, or one-fifth upon second notice. If the latter quorum is not reached, the second meeting may be postponed to a date no later than two months after the date for which it was initially called.

For extraordinary shareholders’ meetings, decisions are made by a two-thirds majority of the votes cast by the shareholders present or represented (by proxy or by mail). The votes cast do not include those attached to shares for which the shareholder did not participate in the vote, abstained, voted blank or for which the vote is otherwise void .

Changes to shareholder rights

Our by-laws can be amended only upon decision of the extraordinary shareholders’ meeting.

Increasing the shareholders’ commitments (engagements) requires the unanimous approval of all shareholders.

Provisions Having the Effect of Delaying, Deferring or Preventing a Change in Control of the Company

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a merger (i.e., in a French law context, a stock for stock exchange following which our company would be dissolved into the acquiring entity and our shareholders would become shareholders of the acquiring entity) of our company into a company incorporated in the European Union would require the approval of our board of directors as well as a two-thirds majority of the votes cast by the shareholders present, represented by proxy or voting by mail at the relevant meeting (unless the merger will result in an increase of the shareholders’ commitments, in which case the approval of each shareholder is required);

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a merger of our company into a company incorporated outside of the European Union would require 100% of our shareholders to approve it;

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under French law, a cash merger is treated as a share purchase and would require the consent of each participating shareholder;

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our shareholders have granted and may grant in the future our board of directors broad authorizations to increase our share capital or to issue additional ordinary shares or other securities (for example, warrants) to our shareholders, the public or qualified investors, including as a possible defense following the launching of a tender offer for our shares;

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our shareholders have preferential subscription rights on a pro rata basis on the issuance by us of any additional securities for cash or a set-off of cash debts, which rights may only be waived by the extraordinary general meeting (by a two-thirds majority vote) of our shareholders or on an individual basis by each shareholder;

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our board of directors has the right to appoint new directors to fill a vacancy created by the resignation or death of a director, subject to the approval by the shareholders of such appointment at the next shareholders’ meeting, which prevents shareholders from having the sole right to fill vacancies on our board of directors;

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our board of directors can only be convened by its chairman or, when no board meeting has been held for more than two consecutive months, by directors representing at least one fourth of the total number of directors;

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the shares are nominative or bearer, if the legislation so permits, according to the shareholder’s choice. Shares issued are registered in individual accounts opened by the company or any authorized intermediary, in the name of each shareholder and kept according to the terms and conditions laid down by the legal and regulatory provisions;

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under French law, (a) a non-French citizen, (b) any French citizen not residing in France, (c) any non-French entity or (d) any French entity controlled by one of the aforementioned persons or entities may have to file a declaration for statistical purposes with the Banque de France within twenty (20) working days following the settlement date of certain direct foreign investment in us, including any purchase of our ADSs. In particular, such filings are required in connection with investments exceeding €15,000,000 that lead to the acquisition of at least 10% of our share capital or voting rights or cross such 10% threshold; see the section of this prospectus supplement titled “Limitations Affecting Shareholders of a French Company—Ownership of ADSs or Shares by Non-French Residents”;

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under French law, certain investments in any entity incorporated in France or governed by French law developing activities in certain strategic industries and activities (such as research and development in biotechnologies and activities relating to public health) by individuals or entities not French, not resident in France or controlled by entities not French or not resident in France are subject to prior authorization of the Minister of Economy; see the section of this prospectus supplement titled “Limitations Affecting Shareholders of a French Company—Ownership of ADSs or Shares by Non-French Residents”;

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approval of at least a majority of the votes held by shareholders present, represented by a proxy, or voting by mail at the relevant ordinary shareholders’ general meeting is required to remove directors with or without cause;

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advance notice is required for nominations to the board of directors or for proposing matters to be acted upon at a shareholders’ meeting, except that a vote to remove and replace a director can be proposed at any shareholders’ meeting without notice;

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the by-laws can be changed in accordance with applicable laws;

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the crossing of certain thresholds has to be disclosed and can impose certain obligations; see the section of this prospectus supplement below titled “Declaration of Crossing of Ownership Thresholds”;

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transfers of shares shall comply with applicable insider trading rules and in particular with MAR; and

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pursuant to French law, the sections of the by-laws relating to the number of directors and election and removal of a director from office may only be modified by a resolution adopted by at least a two-thirds majority vote of our shareholders present, represented by a proxy or voting by mail at the meeting.

Declaration of Crossing of Ownership Thresholds

Set forth below is a summary of certain provisions of our by-laws and of the French Commercial Code applicable to us. This summary is not intended to be a complete description of applicable rules under French law.

Any individual or legal entity referred to in Articles L.233-7, L.233-9 and L.233-10 of the French Commercial Code coming to directly or indirectly own, alone or in concert, a number of shares representing more than 5%, 10%, 15%, 20%, 25%, 30%, 33 1/3%, 50%, 66 2/3%, 90% or 95% of our outstanding share capital or voting rights or that increases or decreases its shareholding or voting rights above or below any of those percentage thresholds, must notify us and the AMF, within four trading days of the date on which such threshold was crossed. Further, any shareholder, alone or acting in concert, crossing the 10%, 15%, 20% or 25% threshold shall file a declaration pursuant to which it shall expose its intention over the following 6 months, including notably whether it intends to continue acquiring our shares, it intends to acquire control over us, its intended strategy for us.

Our by-laws provide that any individual or legal entity, acting alone or in concert, who comes to directly or indirectly, hold a number of shares representing a percentage of our share capital or voting rights higher than or equal to 2.5% or a multiple of this percentage must inform us of the total number of shares, voting rights and securities giving access to the capital or voting rights that it owns immediately or over time, by registered letter with request for acknowledgment of receipt addressed to the registered office within a period of four trading days from the crossing of the said holding thresholds. This obligation also applies under the same conditions when crossing each of the above-mentioned thresholds in a downward direction.

In the event of failure to declare, shares or voting rights exceeding the fraction that should have been declared are deprived of voting rights at general meetings of shareholders for any meeting that would be held until the expiry of a period of two years from the date of regularization of the notification in accordance with Article L. 233-14 of the Commercial Code, if the failure to declare has been determined and one or several shareholders holding at least 2.5% of the capital make the request recorded in the minutes of the general meeting.

We are required to publish the total number of voting rights and shares composing the share capital (if such numbers vary from the numbers previously published) on a monthly basis. The AMF makes this information public. We are subject to AMF regulations regarding public tender offers.

Further, and subject to certain exemptions, any shareholder crossing, alone or acting in concert, the 30% threshold shall file a mandatory public tender offer. Also, any shareholder holding directly or indirectly a number between 30% and 50% of the capital or voting rights and who, in less than twelve consecutive months, increases his/her/its holding of capital or voting rights by at least 1% of the company’s capital or voting rights, shall file a mandatory public tender offer.

Changes in Share Capital

Increases in Share Capital. Pursuant to French law, our share capital may be increased only with shareholders’ approval at an extraordinary general shareholders’ meeting following the recommendation of our board of directors. The shareholders may delegate to our board of directors either the authority (délégation de compétence) or the power (délégation de pouvoir) to carry out any increase in share capital.

Increases in our share capital may be effected by:

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issuing additional shares;

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increasing the par value of existing shares;

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creating a new class of equity securities; and

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exercising the rights attached to securities giving access to the share capital.

Increases in share capital by issuing additional securities may be effected through one or a combination of the following:

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in consideration for cash;

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in consideration for assets contributed in kind;

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through an exchange offer;

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by conversion of previously issued debt instruments;

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by capitalization of profits, reserves or share premium; and

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subject to certain conditions, by way of offset against debt incurred by us.

Decisions to increase the share capital through the capitalization of reserves, profits and/or share premium require shareholders’ approval at an extraordinary general shareholders’ meeting, acting under the quorum and majority requirements applicable to ordinary shareholders’ meetings. Increases effected by an increase in the par value of shares require unanimous approval of the shareholders, unless effected by capitalization of reserves, profits or share premium. All other capital increases require shareholders’ approval at an extraordinary general shareholders’ meeting acting under the regular quorum and majority requirements for such meetings.

Reduction in Share Capital. Pursuant to French law, any reduction in our share capital requires shareholders’ approval at an extraordinary general shareholders’ meeting following the recommendation of our board of directors. The share capital may be reduced either by decreasing the par value of the outstanding shares or by reducing the number of outstanding shares. The number of outstanding shares may be reduced by the repurchase and cancellation of shares. Holders of each class of shares must be treated equally unless each affected shareholder agrees otherwise.

Preferential Subscription Right. According to French law, if we issue additional securities for cash, current shareholders will have preferential subscription rights to these securities on a pro rata basis. Preferential subscription rights entitle the individual or entity that holds them to subscribe pro rata based on the number of shares held by them to the issuance of any securities increasing, or that may result in an increase of, our share capital by means of a cash payment or a set-off of cash debts. The preferential subscription rights are transferable during the subscription period relating to a particular offering.

The preferential subscription rights with respect to any particular offering may be waived at an extraordinary general meeting by a two-thirds vote of our shareholders or individually by each shareholder. Our board of directors and our independent auditors are required by French law to present reports to the shareholders’ meeting that specifically address any proposal to waive the preferential subscription rights.

In the future, to the extent permitted under French law, we may seek shareholder approval to waive preferential subscription rights at an extraordinary general shareholders’ meeting in order to authorize the board of directors to issue additional shares and/or other securities convertible or exchangeable into shares.

Form, Holding and Transfer of Shares

Form of Shares. The shares are nominative or bearer, if the legislation so permits, according to the shareholder’s choice.

Holding of Shares. In accordance with French law concerning the “dematerialization” of securities, the ownership rights of shareholders are represented by book entries instead of share certificates. Shares issued are

registered in individual accounts opened by us or any authorized intermediary, in the name of each shareholder and kept according to the terms and conditions laid down by the legal and regulatory provisions.

Any owner of our shares may elect to have its shares held in registered form and registered in its name in an account currently maintained by Société Générale Securities Services, 32, rue du Champ de Tir, 44300 Nantes, France, and on our behalf or held in bearer form and recorded in its name in an account maintained by an accredited financial intermediary, such as a French broker, bank or other authorized financial institution. Any shareholder may, at its expense, change from one form of holding to the other. Both methods are operated through Euroclear. In addition, according to French law, shares held by any non-French resident may be held on the shareholder’s behalf in a collective account or in several individual accounts by an intermediary.

When our shares are held in bearer form by a beneficial owner who is not a resident of France, Euroclear may agree to issue, upon our request, a bearer depositary receipt with respect to such shares for use only outside France. In this case, the name of the holder is deleted from the accredited financial intermediary’s books. Title to the shares represented by a bearer depositary receipt will pass upon delivery of the relevant receipt outside France.

In accordance with applicable laws, we may request the information referred to in Article L.228-2 of the French Commercial Code at any time from the central depositary responsible for holding our shares. Thus, we are at any time entitled to request the name and year of birth or, in the case of a legal entity, the name and the year of incorporation, nationality and address of the holders of our shares or other securities granting immediate or future voting rights, held in bearer form, and the number of shares or other securities so held and, if applicable, the restrictions relating to such securities. Furthermore, under French law, any intermediary who acts on behalf of one or more persons who are not domiciled in France must declare that it is acting as an intermediary. We may also request the identity of the shareholders on whose behalf it is acting. Consequently, the owner of shares recorded in a collective account or in several individual accounts by an intermediary will be represented in the shareholders’ meetings by this intermediary.

Ownership of Shares by Non-French Persons. Neither French law nor our by-laws limit the right of non-residents of France or non-French persons to own or, where applicable, to vote our securities.

However, under French law, certain investments in any entity incorporated in France or governed by French law by certain individuals or entities not French, not resident in France or controlled by entities not French or resident in France are subject to (i) prior authorization of the Minister of the Economy and/or (ii) filing with the Banque de France; see the section of this prospectus titled “Ownership of ADSs or Shares by Non-French Residents”.

Assignment and Transfer of Shares. Shares are freely negotiable, subject to applicable legal and regulatory provisions. French law notably provides for standstill obligations and prohibition of insider trading.

Differences in Corporate Law


	France	Delaware
Number of Directors	Under French law, a société anonyme must have at least three (3) and may have up to eighteen (18) directors. The number of directors is fixed by or in the manner provided in the by-laws. The number of directors of each gender may not be less than 40%. In case a board of directors comprises up to eight members, the difference between the number of directors of each gender may not exceed	Under Delaware law, a corporation must have at least one director and the number of directors shall be fixed by or in the manner provided in the by-laws.


	France	Delaware
	two. Any appointment made in violation of this limit that is not remedied within six months of this appointment will be null and void and payment of directors’ compensation will be suspended.
Director Qualifications	Under French law, a corporation may prescribe qualifications for directors under its by-laws. In addition, under French law, members of a board of directors of a corporation may be legal entities, and such legal entities may designate an individual to represent them and to act on their behalf at meetings of the board of directors.	Under Delaware law, a corporation may prescribe qualifications for directors under its certificate of incorporation or by-laws. Only individuals may be members of a corporation’s board of directors.
Removal of Directors	Under French law, directors may be removed from office, with or without cause, at any shareholders’ meeting without notice or justification, by a simple majority vote of the shareholders present and voting at the meeting in person or by proxy.	Under Delaware law, unless otherwise provided in the certificate of incorporation, directors may be removed from office, with or without cause, by a majority stockholder vote, though in the case of a corporation whose board is classified, stockholders may effect such removal only for cause.
Vacancies on the Board of Directors	Under French law, vacancies on the board of directors resulting from death or a resignation, provided that at least three (3) directors remain in office, may be filled by a majority of the remaining directors pending ratification by the shareholders at the next shareholders’ meeting.	Under Delaware law, vacancies on a corporation’s board of directors, including those caused by newly created directorships, may be filled by a majority of the remaining directors (even though less than a quorum).
Annual General Meeting	Under French law, the annual general meeting of shareholders shall be held at such place, on such date and at such time as decided each year by the board of directors and notified to the shareholders in the convening notice of the annual meeting, within six months after the close of the relevant fiscal year unless such period is extended by court order.	Under Delaware law, the annual meeting of stockholders shall be held at such place, on such date and at such time as may be designated from time to time by the board of directors or as provided in the certificate of incorporation or by the by-laws.
General or Special Meetings	Under French law, general meetings of the shareholders may be called by the board of directors or, failing that, by the statutory auditors, or by a court appointed agent or	Under Delaware law, special meetings of the stockholders may be called by the board of directors or by such person or


	France	Delaware
	liquidator in certain circumstances, or by the majority shareholder in capital or voting rights following a public tender offer or exchange offer or the transfer of a controlling block on the date decided by the board of directors or the relevant person.	persons as may be authorized by the certificate of incorporation or by the by-laws.
Notice of General Meetings	A convening notice (avis de réunion) is published in the BALO at least thirty-five (35) days prior to a meeting and made available on the website of the company at least twenty-one (21) days prior to the meeting. Subject to special legal provisions, the meeting notice is sent out at least fifteen (15) days prior to the date of the meeting, by means of a notice inserted both in a legal announcement bulletin of the registered office department and in the BALO. Further, the holders of registered shares (actions nominatives) for at least a month at the time of the latest of the insertions of the notice of meeting shall be summoned individually, by regular letter (or by registered letter if they request it and include an advance of expenses) sent to their last known address. This notice may also be transmitted by electronic means of telecommunication, in lieu of any such mailing, to any shareholder requesting it beforehand by registered letter with acknowledgment of receipt in accordance with legal and regulatory requirements, specifying his e-mail address. The Decree No. 2026-94 of 13 February 2026 on the modernization of communication methods with shareholders of certain commercial companies now allows notices of meeting and the prior documentation for general meetings of shareholders of companies listed on a regulated market to be sent electronically to shareholders whose shares are held in registered form. This new rule regarding the notice of meeting and the sending to registered shareholders of the information to be provided prior to the general meeting applies only to general meetings convened as from 1 July 2026. However, for a period of two years from the date of entry into force of the decree, any shareholder already registered in the company’s books on that date may request, by postal mail with acknowledgement of receipt sent to the company no later than 90 days	Under Delaware law, unless otherwise provided in the certificate of incorporation or by-laws, written notice of any meeting of the stockholders must be given to each stockholder entitled to vote at the meeting not less than ten nor more than 60 days before the date of the meeting and shall specify the place, date, hour and purpose or purposes of the meeting.


	France	Delaware
	prior to the publication date of the meeting notice, that the prior communications relating to the general meeting be sent by postal mail. This request will apply to all subsequent meetings. The convening notice must also indicate the conditions under which the shareholders may vote by correspondence and the places and conditions in which they can obtain voting forms by mail.
Proxy	Each shareholder has the right to attend the meetings and participate in the discussions (i) personally, or (ii) by granting proxy to any individual or legal entity of his choosing; or (iii) by sending a proxy to the company without indication of the mandate, or (iv) by voting by correspondence, or (v) by videoconference or another means of telecommunication in accordance with applicable laws that allow identification. The proxy is only valid for a single meeting or for successive meetings convened with the same agenda. It can also be granted for two meetings, one ordinary, the other extraordinary, held on the same day or within a period of fifteen days.	Under Delaware law, at any meeting of stockholders, a stockholder may designate another person to act for such stockholder by proxy, but no such proxy shall be voted or acted upon after three (3) years from its date, unless the proxy provides for a longer period. A director of a Delaware corporation may not issue a proxy representing the director’s voting rights as a director.
Shareholder Action by Written Consent	Under French law, shareholders’ action by written consent is not permitted in a société anonyme.	Under Delaware law, a corporation’s certificate of incorporation (1) may permit stockholders to act by written consent if such action is signed by all stockholders, (2) may permit stockholders to act by written consent signed by stockholders having the minimum number of votes that would be necessary to take such action at a meeting or (3) may prohibit actions by written consent.
Preferential Subscription Rights	Under French law, in case of issuance of additional shares or other securities for cash or set-off against cash debts, the existing shareholders have preferential subscription rights to these securities on a pro rata basis unless such rights are waived by a two-thirds	Under Delaware law, unless otherwise provided in a corporation’s certificate of incorporation, a stockholder does not, by operation of law, possess preemptive rights to


	France	Delaware
	majority of the votes held by the shareholders present at the extraordinary meeting deciding or authorizing the capital increase, voting in person or represented by proxy or voting by mail. In case such rights are not waived by the extraordinary general meeting, each shareholder may individually either exercise, assign or not exercise its preferential subscription rights.	subscribe to additional issuances of the corporation’s stock or to any security convertible into such stock.
Sources of Dividends	Under French law, dividends may only be paid by a French société anonyme out of “distributable profits,” plus any distributable reserves and “distributable premium” that the shareholders decide to make available for distribution, other than those reserves that are specifically required by law. “Distributable profits” consist of the unconsolidated net profits of the relevant corporation for each fiscal year, as increased or reduced by any profit or loss carried forward from prior years, less any contributions to the reserve accounts pursuant to French law or to the reserve set forth in the company’s by-laws (if any). “Distributable premium” refers to the contribution paid by the shareholders in addition to the par value of their shares for their subscription that the shareholders decide to make available for distribution. Except in case of a share capital reduction, no distribution can be made to the shareholders when the net equity is, or would become, lower than the amount of the share capital plus the reserves which cannot be distributed in accordance with the law or by-laws.	Under Delaware law, dividends may be paid by a Delaware corporation either out of (1) surplus or (2) in case there is no surplus, out of its net profits for the fiscal year in which the dividend is declared and/or the preceding fiscal year, except when the capital is diminished by depreciation in the value of its property, or by losses, or otherwise, to an amount less than the aggregate amount of capital represented by issued and outstanding stock having a preference on the distribution of assets.
Repurchase of Shares	Under French law, a corporation may acquire its own shares for the following purposes only in accordance with the safe harbor exemptions provided by MAR: • to decrease its share capital, provided that such decision is not driven by losses and that a purchase offer is made to all shareholders on a pro rata basis, with the approval of the shareholders at the	Under Delaware law, a corporation may generally redeem or repurchase shares of its stock unless the capital of the corporation is impaired or such redemption or repurchase would impair the capital of the corporation.

France

Delaware

extraordinary general meeting deciding the capital reduction;

•

to meet obligations arising from debt securities, that are exchangeable into equity instruments

•

under a buy-back program to be authorized by the shareholders in accordance with the provisions of Article L. 22-10-62 of the French Commercial Code, in accordance with MAR, Commission Delegated Regulation (EU) 2016/1052 of March 8, 2016, and in accordance with the general regulations of the AMF.

All other purposes, and especially share buy-backs for external growth operations by virtue of Article L. 22-10-62 of the French Commercial Code, while not forbidden, must be pursued in strict compliance with market manipulations and insider dealing rules.

Under MAR and in accordance with the General Regulations (règlement général) of the AMF, a corporation shall report to the competent authority of the most relevant market in terms of liquidity, no later than by the end of the seventh daily market session following the date of the execution of the transaction, all the transactions relating to the buy-back program, in a detailed form and in an aggregated form. The receiving competent authority shall, upon request, forward the information to the competent authorities of the trading venue on which the shares have been admitted to trading and are traded.

No such repurchase of shares may result in the company holding, directly or through a person acting on its behalf, more than 10% of its issued share capital.


	France	Delaware
Liability of Directors and Officers	Under French law, the by-laws may not include any provisions limiting the liability of directors.	Under Delaware law, a corporation’s certificate of incorporation may include a provision eliminating or limiting the personal liability of a director to the corporation and its stockholders for damages arising from a breach of fiduciary duty as a director. However, no provision can limit the liability of a director for: • any breach of the director’s duty of loyalty to the corporation or its stockholders; • acts or omissions not in good faith or that involve intentional misconduct or a knowing violation of law; • intentional or negligent payment of unlawful dividends or stock purchases or redemptions; or • any transaction from which the director derives an improper personal benefit.
Voting Rights	French law provides that, unless otherwise provided in the by-laws, each shareholder is entitled to one vote for each share of capital stock held by such shareholder. Further to the introduction of Law No. 2014-384 dated March 29, 2014 (Loi Florange), shares registered under a shareholder’s name for more than two years shall automatically be granted double voting rights from 2016, unless the by-laws expressly reject this measure.	Delaware law provides that, unless otherwise provided in the certificate of incorporation, each stockholder is entitled to one vote for each share of capital stock held by such stockholder.
Shareholder Vote on Certain Transactions	Generally, under French law, completion of a merger, dissolution, sale, lease or exchange of all or substantially all of a corporation’s assets (apport partiel d’actifs) requires: • the approval of the board of directors; and	Generally, under Delaware law, unless the certificate of incorporation provides for the vote of a larger portion of the stock, completion of a merger, consolidation, sale, lease or exchange of all or substantially


	France	Delaware
	• approval by a two-thirds majority of the votes held by the shareholders present, represented by proxy or • voting by mail at the relevant meeting or, in the case of a merger with a non-EU company, approval of all shareholders of the corporation.	all of a corporation’s assets or dissolution requires: • the approval of the board of directors; and • approval by the vote of the holders of a majority of the outstanding stock or, if the certificate of incorporation provides for more or less than one vote per share, a majority of the votes of the outstanding stock of a corporation entitled to vote on the matter.

Dissent or Dissenters Appraisal Rights	French law does not provide for any such right but provides that a merger is subject to shareholders’ approval by a two-thirds majority vote, as stated above.	Under Delaware law, a holder of shares of any class or series has the right, in specified circumstances, to dissent from a merger or consolidation by demanding payment in cash for the stockholder’s shares equal to the fair value of those shares, as determined by the Delaware Chancery Court in an action timely brought by the corporation or a dissenting stockholder. Delaware law grants these appraisal rights only in the case of mergers or consolidations and not in the case of a sale or transfer of assets or a purchase of assets for stock. Further, no appraisal rights are available for shares of any class or series that is listed on a national securities exchange or held of record by more than 2,000 stockholders, unless the agreement of merger or consolidation requires the holders to accept for their shares anything other than: • shares of stock of the surviving corporation; • shares of stock of another corporation that are either listed on a national securities exchange or held of record by more than 2,000 stockholders;


	France	Delaware
		• cash in lieu of fractional shares of the stock described in the two preceding bullet points; or • any combination of the above. In addition, appraisal rights are not available to holders of shares of the surviving corporation in specified mergers that do not require the vote of the stockholders of the surviving corporation.
Standard of Conduct for Directors	French law does not contain specific provisions setting forth the standard of conduct of a director. However, directors have a duty to act without self-interest, on a well-informed basis and they cannot make any decision against a corporation’s corporate interest (intérêt social).	Delaware law does not contain specific provisions setting forth the standard of conduct of a director. The scope of the fiduciary duties of directors is generally determined by the courts of the State of Delaware. In general, directors have a duty to act without self-interest, on a well-informed basis and in a manner they reasonably believe to be in the best interest of the stockholders.
Shareholder Suits	French law provides that a shareholder, or a group of shareholders, may initiate a legal action to seek indemnification from the directors of a corporation in the corporation’s interest if it fails to bring such legal action itself. If so, any damages awarded by the court are paid to the corporation and any legal fees relating to such action are borne by the relevant shareholder or the group of shareholders. The plaintiff must remain a shareholder through the duration of the legal action. There is no other case where shareholders may initiate a derivative action to enforce a right of a corporation. A shareholder may alternatively or cumulatively bring individual legal action against the directors, provided he has suffered distinct damages from those suffered by the	Under Delaware law, a stockholder may initiate a derivative action to enforce a right of a corporation if the corporation fails to enforce the right itself. The complaint must: • state that the plaintiff was a stockholder at the time of the transaction of which the plaintiff complains or that the plaintiff’s shares thereafter devolved on the plaintiff by operation of law; and • allege with particularity the efforts made by the plaintiff to obtain the action the plaintiff desires from the directors and the reasons for


	France	Delaware
	corporation. In this case, any damages awarded by the court are paid to the relevant shareholder.	the plaintiff’s failure to obtain the action; or • state the reasons for not making the effort. Additionally, the plaintiff must remain a stockholder through the duration of the derivative suit. The action will not be dismissed or compromised without the approval of the Delaware Court of Chancery.
Amendment of Certificate of Incorporation	Unlike companies incorporated under Delaware law, whose organizational documents are comprised of a certificate of incorporation and by-laws, companies incorporated under French law only have by-laws (statuts) as organizational documents. As indicated below, only the extraordinary shareholders’ meeting is authorized to adopt or amend the by-laws under French law.	Under Delaware law, generally a corporation may amend its certificate of incorporation if: • its board of directors has adopted a resolution setting forth the amendment proposed and declared its advisability; and • the amendment is adopted by the affirmative votes of a majority (or greater percentage as may be specified by the corporation) of the outstanding shares entitled to vote on the amendment and a majority (or greater percentage as may be specified by the corporation) of the outstanding shares of each class or series of stock, if any, entitled to vote on the amendment as a class or series.
Amendment of By-laws	Under French law, only the extraordinary shareholders’ meeting is authorized to adopt or amend the by-laws. The extraordinary shareholders’ meeting may authorize the board of directors to amend the by-laws to comply with legal provisions, subject to the ratification of such amendments by the next extraordinary shareholders’ meeting. The board of directors is also authorized to amend the by-laws as a result of a decision to relocate the company’s registered office in France, subject to ratification by the next ordinary shareholders’ meeting.	Under Delaware law, the stockholders entitled to vote have the power to adopt, amend or repeal by-laws. A corporation may also confer, in its certificate of incorporation, that power upon the board of directors.

Other French and E.U. Law Considerations

Takeover Provisions

Declaration for Statistical Purpose. Under French law, a non-French resident as well as any French entity controlled by non-French residents may have to file a declaration for statistical purposes with the Bank of France (Banque de France), within twenty (20) working days following the date of certain direct foreign investments in us, including any purchase of our ADSs. In particular, such filings are required in connection with investments exceeding €15,000,000 that lead to the acquisition of at least 10% of our share capital or voting rights or cross such 10% threshold. Violation of this filing requirement may be sanctioned by five years of imprisonment and a fine up to twice the amount of the relevant investment. This amount may be increased fivefold if the violation is made by a legal entity.

Authorization of the Minister of Economy. Under French law, certain investments in a French company relating to strategic sectors and activities likely to prejudice the interests of national defense, participating in the exercise of public authority or likely to prejudice public order and public security (such as research and development in biotechnologies intended to be carried out in a sensitive activity within the meaning of § I or II of Article R. 151-3 of the French Monetary and Financial Code or activities relating to infrastructure, goods or services essential to guarantee the protection of public health) by individuals or entities not French, not resident in France or controlled by entities not French or not resident in France are subject to prior authorization of the Minister of Economy pursuant to Articles L. 151-1 and seq. and R. 151-1 and seq. of the French Monetary and Financial Code.

Majority Shareholder Rights. The owner of 90% of the share capital and voting rights of a public company listed on a regulated market in a Member State of the European Union or in a state party to the EEA Agreement, including from the main French Stock Exchange, has the right to force out minority shareholders following a tender offer made to all shareholders.

Transfer Agent and Registrar

The transfer agent and registrar for our ADSs is Citibank, N.A. The transfer agent and registrar for our ordinary shares is Société Générale Securities Services.

Listing

Our ADSs are listed on the Nasdaq Capital Market under the symbol “DBVT” and our ordinary shares are listed on Euronext Paris under the symbol “DBV.”

DESCRIPTION OF AMERICAN DEPOSITARY SHARES

Citibank, N.A. acts as the depositary for our ADSs. Citibank’s depositary offices are located at 388 Greenwich Street, New York, New York 10013. ADSs represent ownership interests in securities that are on deposit with the depositary. ADSs may be represented by certificates that are commonly known as American depositary receipts, or ADRs. The depositary typically appoints a custodian to safekeep the securities on deposit. In this case, the custodian is Citibank Europe Plc, located at EGSP 186, 1 North Wall Quay, Dublin 1 Ireland.

We have appointed Citibank as depositary pursuant to a deposit agreement. A copy of the deposit agreement, amendment no. 1 to the deposit agreement and amendment no. 2 to the deposit agreement are on file with the SEC under cover of a Registration Statement on Form F-6 (as amended). You may obtain a copy of the deposit agreement and the amendments to the deposit agreement from the SEC’s website at www.sec.gov. Please refer to (i) File Number 333-265201 when retrieving a copy of the deposit agreement, and (ii) File Number 333-266202 when retrieving copies of the amendments to the deposit agreement.

We are providing you with a summary description of the material terms of the ADSs and of your material rights as an owner of ADSs. Please remember that summaries by their nature lack the precision of the information summarized and that the rights and obligations of an owner of ADSs will be determined by reference to the terms of the deposit agreement and not by this summary. We urge you to review the deposit agreement in its entirety. The portions of this summary description that are italicized describe matters that may be relevant to the ownership of ADSs but that may not be contained in the deposit agreement.

Each ADS represents the right to receive, and to exercise the beneficial ownership interests in, five ordinary shares on deposit with the depositary or the custodian. An ADS also represents the right to receive, and to exercise the beneficial ownership interests in, any other property received by the depositary or the custodian on behalf of the owner of the ADS but that has not been distributed to the owners of ADSs because of legal restrictions or practical considerations. We and the depositary may agree to change the ADS-to-ordinary share ratio as provided in the deposit agreement. This amendment may give rise to, or change, the depositary fees payable by ADS owners. The custodian, the depositary and their respective nominees will hold all deposited property for the benefit of the holders and beneficial owners of ADSs. The deposited property does not constitute the proprietary assets of the depositary, the custodian or their nominees. Beneficial ownership in the deposited property will under the terms of the deposit agreement be vested in the beneficial owners of the ADSs. The depositary, the custodian and their respective nominees will be the record holders of the deposited property represented by the ADSs for the benefit of the holders and beneficial owners of the corresponding ADSs. A beneficial owner of ADSs may or may not be the holder of ADSs. Beneficial owners of ADSs will be able to receive, and to exercise beneficial ownership interests in the deposited property only through the registered holders of the ADSs, by the registered holders of the ADSs (on behalf of the applicable ADS owners) only through the depositary, and by the depositary (on behalf of the owners of the corresponding ADSs) directly, or indirectly through the custodian or their respective nominees, in each case upon the terms of the deposit agreement.

If you become an owner of ADSs, you will become a party to the deposit agreement and therefore will be bound to its terms and to the terms of any ADR that represents your ADSs. The deposit agreement and the ADR specify our rights and obligations as well as your rights and obligations as owner of ADSs and those of the depositary. As an ADS holder you appoint the depositary to act on your behalf in certain circumstances. The deposit agreement and the ADRs are governed by New York law. However, our obligations to the holders of ordinary shares will continue to be governed by the laws of France, which may be different from the laws in the United States.

In addition, applicable laws and regulations may require you to satisfy reporting requirements and obtain regulatory approvals in certain circumstances. You are solely responsible for complying with such reporting requirements and obtaining such approvals. Neither the depositary, the custodian, us or any of their or our

respective agents or affiliates shall be required to take any actions whatsoever on your behalf to satisfy such reporting requirements or obtain such regulatory approvals under applicable laws and regulations.

As an owner of ADSs, we will not treat you as one of our shareholders and you will not have direct shareholder rights. The depositary will hold on your behalf the shareholder rights attached to the ordinary shares underlying your ADSs. As an owner of ADSs you will be able to exercise the shareholders rights for the ordinary shares represented by your ADSs through the depositary only to the extent contemplated in the deposit agreement. To exercise any shareholder rights not contemplated in the deposit agreement you will, as an ADS owner, need to arrange for the cancellation of your ADSs and become a direct shareholder.

The manner in which you own the ADSs (e.g., in a brokerage account vs. as registered holder, or as holder of certificated vs. uncertificated ADSs) may affect your rights and obligations, and the manner in which, and extent to which, the depositary’s services are made available to you. As an owner of ADSs, you may hold your ADSs either by means of an ADR registered in your name, through a brokerage or safekeeping account, or through an account established by the depositary in your name reflecting the registration of uncertificated ADSs directly on the books of the depositary, commonly referred to as the direct registration system, or DRS. The direct registration system reflects the uncertificated (book-entry) registration of ownership of ADSs by the depositary. Under the direct registration system, ownership of ADSs is evidenced by periodic statements issued by the depositary to the holders of the ADSs. The direct registration system includes automated transfers between the depositary and The Depository Trust Company, or DTC, the central book-entry clearing and settlement system for equity securities in the United States. If you decide to hold your ADSs through your brokerage or safekeeping account, you must rely on the procedures of your broker or bank to assert your rights as ADS owner. Banks and brokers typically hold securities such as the ADSs through clearing and settlement systems such as DTC. The procedures of such clearing and settlement systems may limit your ability to exercise your rights as an owner of ADSs. Please consult with your broker or bank if you have any questions concerning these limitations and procedures. All ADSs held through DTC will be registered in the name of a nominee of DTC. This summary description assumes you have opted to own the ADSs directly by means of an ADS registered in your name and, as such, we will refer to you as the “holder.” When we refer to “you,” we assume the reader owns ADSs and will own ADSs at the relevant time.

The registration of the ordinary shares in the name of the depositary or the custodian shall, to the maximum extent permitted by applicable law, vest in the depositary or the custodian the record ownership in the applicable ordinary shares with the beneficial ownership rights and interests in such ordinary shares being at all times vested with the beneficial owners of the ADSs representing the ordinary shares. The depositary or the custodian shall at all times be entitled to exercise the beneficial ownership rights in all deposited property, in each case only on behalf of the holders and beneficial owners of the ADSs representing the deposited property.

Dividends and Distributions

As a holder of ADSs, you generally have the right to receive the distributions we make on the securities deposited with the custodian. Your receipt of these distributions may be limited, however, by practical considerations and legal limitations. Holders of ADSs will receive such distributions under the terms of the deposit agreement in proportion to the number of ADSs held as of a specified record date, after deduction the applicable fees, taxes and expenses.

Distributions of Cash

Whenever we make a cash distribution for the securities on deposit with the custodian, we will deposit the funds with the custodian. Upon receipt of confirmation of the deposit of the requisite funds, the depositary will arrange for the funds received in a currency other than U.S. dollars to be converted into U.S. dollars and for the distribution of the U.S. dollars to the holders, subject to French laws and regulations.

The conversion into U.S. dollars will take place only if practicable and if the U.S. dollars are transferable to the United States. The depositary will apply the same method for distributing the proceeds of the sale of any property (such as undistributed rights) held by the custodian in respect of securities on deposit.

The distribution of cash will be made net of the fees, expenses, taxes and governmental charges payable by holders under the terms of the deposit agreement. The depositary will hold any cash amounts it is unable to distribute in a non-interest bearing account for the benefit of the applicable holders and beneficial owners of ADSs until the distribution can be effected or the funds that the depositary holds must be escheated as unclaimed property in accordance with the laws of the relevant states of the United States.

Distributions of Ordinary Shares

Whenever we make a free distribution of ordinary shares for the securities on deposit with the custodian, we will deposit the applicable number of ordinary shares with the custodian. Upon receipt of confirmation of such deposit, the depositary will either distribute to holders new ADSs representing the ordinary shares deposited or modify the ADS-to-ordinary share ratio, in which case each ADS you hold will represent rights and interests in the additional ordinary shares so deposited. Only whole new ADSs will be distributed. Fractional entitlements will be sold and the proceeds of such sale will be distributed as in the case of a cash distribution.

The distribution of new ADSs or the modification of the ADS-to-ordinary share ratio upon a distribution of ordinary shares will be made net of the fees, expenses, taxes and governmental charges payable by holders under the terms of the deposit agreement. In order to pay such taxes or governmental charges, the depositary may sell all or a portion of the new ordinary shares so distributed.

No such distribution of new ADSs will be made if it would violate a law (i.e., the U.S. securities laws) or if it is not operationally practicable. If the depositary does not distribute new ADSs as described above, it may sell the ordinary shares received upon the terms described in the deposit agreement and will distribute the proceeds of the sale as in the case of a distribution of cash.

Distributions of Rights

Whenever we intend to distribute rights to subscribe for additional ordinary shares, we will give prior notice to the depositary and we will assist the depositary in determining whether it is lawful and reasonably practicable to distribute rights to subscribe for additional ADSs to holders.

The depositary will establish procedures to distribute rights to subscribe for additional ADSs to holders and to enable such holders to exercise such rights if it is lawful and reasonably practicable to make the rights available to holders of ADSs, and if we provide all of the documentation contemplated in the deposit agreement (such as opinions to address the lawfulness of the transaction). You may have to pay fees, expenses, taxes and other governmental charges to subscribe for the new ADSs upon the exercise of your rights. The depositary is not obligated to establish procedures to facilitate the distribution and exercise by holders of rights to subscribe for new ordinary shares other than in the form of ADSs.

The depositary will not distribute the rights to you if:

•

we do not timely request that the rights be distributed to you or we request that the rights not be distributed to you; or

•

we fail to deliver satisfactory documents to the depositary; or

•

it is not reasonably practicable to distribute the rights.

The depositary will sell the rights that are not exercised or not distributed if such sale is lawful and reasonably practicable. The proceeds of such sale will be distributed to holders as in the case of a cash distribution. If the depositary is unable to sell the rights, it will allow the rights to lapse.

Elective Distributions

Whenever we intend to distribute a dividend payable at the election of shareholders either in cash or in additional ordinary shares, we will give prior notice thereof to the depositary and will indicate whether we wish the elective distribution to be made available to you. In such case, we will assist the depositary in determining whether such distribution is lawful and reasonably practicable.

The depositary will make the election available to you only if it is reasonably practicable and if we have provided all of the documentation contemplated in the deposit agreement. In such case, the depositary will establish procedures to enable you to elect to receive either cash or additional ADSs, in each case as described in the deposit agreement.

If the election is not made available to you, you will receive either cash or additional ADSs, depending on what a shareholder in France would receive upon failing to make an election, as more fully described in the deposit agreement.

Other Distributions

Whenever we intend to distribute property other than cash, ordinary shares or rights to subscribe for additional ordinary shares, we will notify the depositary in advance and will indicate whether we wish such distribution to be made to you. If so, we will assist the depositary in determining whether such distribution to holders is lawful and reasonably practicable.

If it is reasonably practicable to distribute such property to you and if we provide to the depositary all of the documentation contemplated in the deposit agreement, the depositary will distribute the property to the holders in a manner it deems practicable.

The distribution will be made net of fees, expenses, taxes and governmental charges payable by holders under the terms of the deposit agreement. In order to pay such taxes and governmental charges, the depositary may sell all or a portion of the property received.

The depositary will not distribute the property to you and will sell the property if:

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we do not request that the property be distributed to you or if we ask that the property not be distributed to you; or

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we do not deliver satisfactory documents to the depositary; or

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depositary determines that all or a portion of the distribution to you is not reasonably practicable.

The proceeds of such a sale will be distributed to holders as in the case of a cash distribution.

Redemption

Whenever we decide to redeem any of the securities on deposit with the custodian, we will notify the depositary in advance. If it is practicable and if we provide all of the documentation contemplated in the deposit agreement, the depositary will provide notice of the redemption to the holders.

The custodian will be instructed to surrender the ordinary shares being redeemed against payment of the applicable redemption price. The depositary will convert the redemption funds received in a currency other than

U.S. dollars into U.S. dollars upon the terms of the deposit agreement and will establish procedures to enable holders to receive the net proceeds from the redemption upon surrender of their ADSs to the depositary. You may have to pay fees, expenses, taxes and other governmental charges upon the redemption of your ADSs. If less than all ADSs are being redeemed, the ADSs to be retired will be selected by lot or on a pro rata basis, as the depositary may determine.

Changes Affecting Ordinary Shares

The ordinary shares held on deposit for your ADSs may change from time to time. For example, there may be a change in nominal or par value, a split-up, cancellation, consolidation or any other reclassification of such ordinary shares or a recapitalization, reorganization, merger, consolidation or sale of assets.

If any such change were to occur, your ADSs would, to the extent permitted by law and the deposit agreement, represent the right to receive the property received or exchanged in respect of the ordinary shares held on deposit. The depositary may in such circumstances deliver new ADSs to you, amend the deposit agreement, the ADRs and the applicable Registration Statement(s) on Form F-6, call for the exchange of your existing ADSs for new ADSs and take any other actions that are appropriate to reflect as to the ADSs the change affecting the ordinary shares. If the depositary may not lawfully distribute such property to you, the depositary may sell such property and distribute the net proceeds to you as in the case of a cash distribution.

Issuance of ADSs upon Deposit of Ordinary Shares

Upon completion of an offering, the ordinary shares being offered pursuant to this prospectus will be deposited by us with the custodian. Upon receipt of confirmation of such deposit, the depositary will issue ADSs to the underwriters, dealer or other purchaser, in each case as named in the prospectus.

The depositary may create ADSs on your behalf if you or your broker deposit ordinary shares with the custodian. The depositary will deliver these ADSs to the person you indicate only after you pay any applicable issuance fees and any charges and taxes payable for the transfer of the ordinary shares to the custodian. Your ability to deposit ordinary shares and receive ADSs may be limited by U.S. and French legal considerations applicable at the time of deposit.

The issuance of ADSs may be delayed until the depositary or the custodian receives confirmation that all required approvals have been given and that the ordinary shares have been duly transferred to the custodian. The depositary will only issue ADSs in whole numbers.

When you make a deposit of ordinary shares, you will be responsible for transferring good and valid title to the depositary. As such, you will be deemed to represent and warrant that:

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The ordinary shares are duly authorized, validly issued, fully paid, non-assessable and legally obtained.

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All preemptive (and similar) rights, if any, with respect to such ordinary shares have been validly waived or exercised.

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You are duly authorized to deposit the ordinary shares.

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The ordinary shares presented for deposit are free and clear of any lien, encumbrance, security interest, charge, mortgage or adverse claim, and are not, and the ADSs issuable upon such deposit will not be, “restricted securities” (as defined in the deposit agreement).

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The ordinary shares presented for deposit have not been stripped of any rights or entitlements.

If any of the representations or warranties are incorrect in any way, we and the depositary may, at your cost and expense, take any and all actions necessary to correct the consequences of the misrepresentations.

Transfer, Combination and Split Up of ADRs

As an ADR holder, you will be entitled to transfer, combine or split up your ADRs and the ADSs evidenced thereby. For transfers of ADRs, you will have to surrender the ADRs to be transferred to the depositary and also must:

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ensure that the surrendered ADR is properly endorsed or otherwise in proper form for transfer;

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provide such proof of identity and genuineness of signatures as the depositary deems appropriate;

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provide any transfer stamps required by the State of New York or the United States; and

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pay all applicable fees, charges, expenses, taxes and other government charges payable by ADR holders pursuant to the terms of the deposit agreement, upon the transfer of ADRs.

To have your ADRs either combined or split up, you must surrender the ADRs in question to the depositary with your request to have them combined or split up, and you must pay all applicable fees, charges and expenses payable by ADR holders, pursuant to the terms of the deposit agreement, upon a combination or split up of ADRs.

Withdrawal of Ordinary Shares Upon Cancellation of ADSs

As a holder, you will be entitled to present your ADSs to the depositary for cancellation and then receive the corresponding number of underlying ordinary shares at the custodian’s offices. Your ability to withdraw the ordinary shares held in respect of the ADSs may be limited by U.S. and French legal considerations applicable at the time of withdrawal. In order to withdraw the ordinary shares represented by your ADSs, you will be required to pay to the depositary the fees for cancellation of ADSs and any charges and taxes payable upon the transfer of the ordinary shares being withdrawn. You assume the risk for delivery of all funds and securities upon withdrawal. Once canceled, the ADSs will not have any rights under the deposit agreement.

If you hold ADSs registered in your name, the depositary may ask you to provide proof of identity and genuineness of any signature and such other documents as the depositary may deem appropriate before it will cancel your ADSs. The withdrawal of the ordinary shares represented by your ADSs may be delayed until the depositary receives satisfactory evidence of compliance with all applicable laws and regulations. Please keep in mind that the depositary will only accept ADSs for cancellation that represent a whole number of securities on deposit.

You will have the right to withdraw the securities represented by your ADSs at any time except for:

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temporary delays that may arise because (i) the transfer books for the ordinary shares or ADSs are closed, or (ii) ordinary shares are immobilized on account of a shareholders’ meeting or a payment of dividends obligations to pay fees, taxes and similar charges; or

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restrictions imposed because of laws or regulations applicable to ADSs or the withdrawal of securities on deposit.

The deposit agreement may not be modified to impair your right to withdraw the securities represented by your ADSs except to comply with mandatory provisions of law.

Voting Rights

As a holder, you generally have the right under the deposit agreement to instruct the depositary to exercise the voting rights for the ordinary shares represented by your ADSs. The voting rights of holders of ordinary shares are described in the sections of this prospectus titled “Description of Share Capital and By-laws” and “Limitations Affecting Shareholders of a French Company.”

At our request, the depositary will distribute to you any notice of shareholders’ meeting received from us together with information explaining how to instruct the depositary to exercise the voting rights of the securities represented by ADSs. In lieu of distributing such materials, the depositary may distribute to holders of ADSs instructions on how to retrieve such materials upon request.

If the depositary timely receives voting instructions from a holder of ADSs, it will endeavor to vote the securities (in person or by proxy) represented by the holder’s ADSs in accordance with such voting instructions.

Please note that the ability of the depositary to carry out voting instructions may be limited by practical and legal limitations and the terms of the securities on deposit. We cannot assure you that you will receive voting materials in time to enable you to return voting instructions to the depositary in a timely manner. Securities for which no timely voting instructions have been received will not be voted.

Fees and Charges

As an ADS holder, you will be required to pay the following service fees under the terms of the deposit agreement to the depositary:


Service		Fees
1. Issuance of ADSs upon deposit of ordinary shares (excluding issuances as a result of distributions described in paragraph (4) below).		Up to U.S. $0.05 per ADS issued

2. Delivery of deposited securities against surrender of ADSs.		Up to U.S. $0.05 per ADS surrendered

3. Distribution of cash dividends or other cash distributions (i.e., sale of rights and other entitlements).		Up to U.S. $0.05 per ADS held

4. Distribution of ADSs pursuant to (i) stock dividends or other free stock distributions, or (ii) exercise of rights to purchase additional ADSs.		Up to U.S. $0.05 per ADS held

5. Distribution of securities other than ADSs or rights to purchase additional ADSs (i.e., spin-off shares).		Up to U.S. $0.05 per ADS held

6. ADS Services.		Up to U.S. $0.05 per ADS held on the applicable record date(s) established by the depositary

We, ADS holders, beneficial owners, persons depositing ordinary shares and persons surrendering ADSs for cancellation and for the purpose of withdrawing deposited securities shall be responsible for the following ADS charges under the terms of the deposit agreement:

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taxes (including applicable interest and penalties) and other governmental charges;

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such registration fees as may from time to time be in effect for the registration of ordinary shares or other deposited securities on the share register and applicable to transfers of ordinary shares or other deposited securities to or from the name of the custodian, the depositary or any nominees upon the making of deposits and withdrawals, respectively;

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such cable, telex and facsimile transmission and delivery expenses as are expressly provided in the deposit agreement to be at the expense of the person depositing ordinary shares or withdrawing deposited securities or of the holders and beneficial owners of ADSs;

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the expenses and charges incurred by the depositary in the conversion of foreign currency;

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such fees and expenses as are incurred by the depositary in connection with compliance with exchange control regulations and other regulatory requirements applicable to ordinary shares, deposited securities, ADSs and ADRs; and

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the fees and expenses incurred by the depositary, the custodian, or any nominee in connection with the servicing or delivery of deposited property.

ADS fees and charges payable upon (i) deposit of ordinary shares against issuance of ADSs and (ii) surrender of ADSs for cancellation and withdrawal of deposited securities will be payable by the person to whom the ADSs so issued are delivered by the depositary (in the case of ADS issuances) and by the person who delivers the ADSs for cancellation to the depositary (in the case of ADS cancellations). In the case of ADSs issued by the depositary into DTC or presented to the depositary via DTC, the ADS issuance and cancellation fees and charges will be payable by the DTC participant(s) receiving the ADSs from the depositary or the DTC participant(s) surrendering the ADSs to the depositary for cancellation, as the case may be, on behalf of the beneficial owner(s) and will be charged by the DTC participant(s) to the account(s) of the applicable beneficial owner(s) in accordance with the procedures and practices of the DTC participant(s) as in effect at the time. ADS fees and charges in respect of distributions and the ADS service fee are payable by holders as of the applicable ADS record date established by the depositary. In the case of distributions of cash, the amount of the applicable ADS fees and charges is deducted from the funds being distributed. In the case of (i) distributions other than cash and (ii) the ADS service fee, the applicable holders as of the ADS record date established by the depositary will be invoiced for the amount of the ADS fees and charges. For ADSs held through DTC, the ADS fees and charges for distributions other than cash and the ADS service fee are charged to the DTC participants in accordance with the procedures and practices prescribed by DTC from time to time and the DTC participants in turn charge the amount of such ADS fees and charges to the beneficial owners for whom they hold ADSs.

In the event of refusal to pay the depositary fees, the depositary may, under the terms of the deposit agreement, refuse the requested service until payment is received or may set off the amount of the depositary fees from any distribution to be made to the ADS holder.

Note that the fees and charges you may be required to pay may vary over time and may be changed by us and by the depositary. You will receive prior notice of such changes.

The depositary may reimburse us for certain expenses incurred by us in respect of the ADR program established pursuant to the deposit agreement, by making available a portion of the ADS fees charged in respect of the ADR program or otherwise, upon such terms and conditions as we and the depositary may agree from time to time.

Amendments and Termination

We may agree with the depositary to modify the deposit agreement at any time without your consent. We undertake to give holders 30 days’ prior notice of any modifications that would materially prejudice any of their substantial rights under the deposit agreement. We will not consider to be materially prejudicial to your substantial rights any modifications or supplements that are reasonably necessary for the ADSs to be registered under the Securities Act or to be eligible for book-entry settlement, in each case without imposing or increasing the fees and charges you are required to pay. In addition, we may not be able to provide you with prior notice of any modifications or supplements that are required to accommodate compliance with applicable provisions of law.

You will be bound by the modifications to the deposit agreement if you continue to hold your ADSs after the modifications to the deposit agreement become effective. The deposit agreement cannot be amended to prevent you from withdrawing the ordinary shares represented by your ADSs (except as permitted by law).

We have the right to direct the depositary to terminate the deposit agreement. Similarly, the depositary may in certain circumstances on its own initiative terminate the deposit agreement. In either case, the depositary must give notice to the holders at least 30 days before termination. Until termination, your rights under the deposit agreement will be unaffected.

After termination, the depositary will continue to collect distributions received (but will not distribute any such property until you request the cancellation of your ADSs) and may sell the securities held on deposit. After the sale, the depositary will hold the proceeds from such sale and any other funds then held for the holders of ADSs in a non-interest bearing account. At that point, the depositary will have no further obligations to holders other than to account for the funds then held for the holders of ADSs still outstanding (after deduction of applicable fees, taxes and expenses).

Books of Depositary

The depositary will maintain ADS holder records at its depositary office. You may inspect such records at such office during regular business hours but solely for the purpose of communicating with other holders in the interest of business matters relating to the ADSs and the deposit agreement.

The depositary will maintain in New York facilities to record and process the issuance, cancellation, combination, split-up and transfer of ADSs. These facilities may be closed from time to time, to the extent not prohibited by law.

Limitations on Obligations and Liabilities

The deposit agreement limits our obligations and the depositary’s obligations to you. Please note the following:

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We and the depositary are obligated only to take the actions specifically stated in the deposit agreement without negligence or bad faith.

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The depositary disclaims any liability for any failure to carry out voting instructions, for any manner in which a vote is cast or for the effect of any vote, provided it acts in good faith and in accordance with the terms of the deposit agreement.

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The depositary disclaims any liability for any failure to determine the lawfulness or practicality of any action, for the content of any document forwarded to you on our behalf or for the accuracy of any translation of such a document, for the investment risks associated with investing in ordinary shares, for the validity or worth of the ordinary shares, for any tax consequences that result from the ownership of ADSs, for the credit-worthiness of any third party, for allowing any rights to lapse under the terms of the deposit agreement, for the timeliness of any of our notices or for our failure to give notice.

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We and the depositary will not be obligated to perform any act that is inconsistent with the terms of the deposit agreement.

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We and the depositary disclaim any liability if we or the depositary are prevented or forbidden from or subject to any civil or criminal penalty or restraint on account of, or delayed in, doing or performing any act or thing required by the terms of the deposit agreement, by reason of any provision, present or future of any law or regulation, or by reason of present or future provision of any provision of our by-laws, or any provision of or governing the securities on deposit, or by reason of any act of God or war or other circumstances beyond our control.

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We and the depositary disclaim any liability by reason of any exercise of, or failure to exercise, any discretion provided for in the deposit agreement or in our by-laws or in any provisions of or governing the securities on deposit.

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We and the depositary further disclaim any liability for any action or inaction in reliance on the advice or information received from legal counsel, accountants, any person presenting ordinary shares for deposit, any holder of ADSs or authorized representatives thereof, or any other person believed by either of us in good faith to be competent to give such advice or information.

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We and the depositary also disclaim liability for the inability by a holder to benefit from any distribution, offering, right or other benefit that is made available to holders of ordinary shares but is not, under the terms of the deposit agreement, made available to you.

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We and the depositary may rely without any liability upon any written notice, request or other document believed to be genuine and to have been signed or presented by the proper parties.

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We and the depositary also disclaim liability for any consequential or punitive damages for any breach of the terms of the deposit agreement.

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No disclaimer of any Securities Act liability is intended by any provision of the deposit agreement.

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Nothing in the deposit agreement gives rise to a partnership or joint venture, or establishes a fiduciary relationship, among us, the depositary and you as ADS holder.

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Nothing in the deposit agreement precludes the depositary (or its affiliates) from engaging in transactions in which parties adverse to us or the ADS owners have interests, and nothing in the deposit agreement obligates the depositary to disclose those transactions, or any information obtained in the course of those transactions, to us or to the ADS owners, or to account for any payment received as part of those transactions.

As the above limitations relate to our obligations and the depositary’s obligations to you under the deposit agreement, we believe that, as a matter of construction of the clause, such limitations would likely to continue to apply to ADS holders who withdraw the ordinary shares from the ADS facility with respect to obligations or liabilities incurred under the deposit agreement before the cancellation of the ADSs and the withdrawal of the ordinary shares, and such limitations would most likely not apply to ADS holders who withdraw the ordinary shares from the ADS facility with respect to obligations or liabilities incurred after the cancellation of the ADSs and the withdrawal of the ordinary shares and not under the deposit agreement.

In any event, you will not be deemed, by agreeing to the terms of the deposit agreement, to have waived our or the depositary’s compliance with U.S. federal securities laws and the rules and regulations promulgated thereunder. In fact, you cannot waive our or the depositary’s compliance with U.S. federal securities laws and the rules and regulations promulgated thereunder.

Pre-Release Transactions

The depositary bank has informed us that it no longer engages in pre-release transactions, and has no intention to do so in the future.

Taxes

You will be responsible for the taxes and other governmental charges payable on the ADSs and the securities represented by the ADSs. We, the depositary and the custodian may deduct from any distribution the taxes and governmental charges payable by holders and may sell any and all property on deposit to pay the taxes and governmental charges payable by holders. You will be liable for any deficiency if the sale proceeds do not cover the taxes that are due.

The depositary may refuse to issue ADSs, to deliver, transfer, split and combine ADRs or to release securities on deposit until all taxes and charges are paid by the applicable holder. The depositary and the custodian may take reasonable administrative actions to obtain tax refunds and reduced tax withholding for any distributions on your behalf. However, you may be required to provide to the depositary and to the custodian proof of taxpayer status and residence and such other information as the depositary and the custodian may require to fulfill legal obligations. You are required to indemnify us, the depositary and the custodian for any claims with respect to taxes based on any tax benefit obtained for you.

Foreign Currency Conversion

The depositary will arrange for the conversion of all foreign currency received into U.S. dollars if such conversion is practical, and it will distribute the U.S. dollars in accordance with the terms of the deposit agreement. You may have to pay fees and expenses incurred in converting foreign currency, such as fees and expenses incurred in complying with currency exchange controls and other governmental requirements.

If the conversion of foreign currency is not practical or lawful, or if any required approvals are denied or not obtainable at a reasonable cost or within a reasonable period, the depositary may take the following actions in its discretion:

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convert the foreign currency to the extent practical and lawful and distribute the U.S. dollars to the holders for whom the conversion and distribution is lawful and practical;

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distribute the foreign currency to holders for whom the distribution is lawful and practical; and

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hold the foreign currency (without liability for interest) for the applicable holders.

Governing Law/Waiver of Jury Trial

The deposit agreement, the ADRs and the ADSs will be interpreted in accordance with the laws of the State of New York. The rights of holders of ordinary shares (including ordinary shares represented by ADSs) are governed by the laws of France.

As an owner of ADSs, you irrevocably agree that any legal action arising out of the deposit agreement, the ADSs or the ADRs, involving the Company or the Depositary, may only be instituted in a state or federal court in the city of New York.

DESCRIPTION OF WARRANTS

Warrants (bons de souscription d’actions) may be offered separately or together with ordinary shares or ADSs. The applicable prospectus supplement will include details of the terms and conditions covering the warrants being offered.

The particular terms of each issue or series of warrants will be described in the related prospectus supplement. If warrants for the purchase of ordinary shares or ADSs are offered, the description will include, where applicable:

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the designation and aggregate number of warrants offered;

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the price at which the warrants will be offered;

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the currency or currency unit in which the warrants will be denominated;

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the date on which the right to exercise the warrants will commence and the date on which the right will expire;

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the number of ordinary shares or ADSs that may be purchased upon exercise of each warrant and the price at which and currency or currencies in which that amount of ordinary shares or ADSs may be purchased upon exercise of each warrant;

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the date or dates, if any, on or after which the warrants and the related ordinary shares or ADSs will be transferable separately;

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the minimum or maximum amount, if any, of warrants that may be exercised at any one time;

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whether the warrants will be subject to redemption or call, and, if so, the terms of such redemption or call provisions; and

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any other terms, conditions and rights (or limitations on such rights) of the warrants.

We reserve the right to set forth in a prospectus supplement or applicable free writing prospectus specific terms of the warrants that are not within the options and parameters set forth in this prospectus. In addition, to the extent that any particular terms and conditions of the warrants described in a prospectus supplement or applicable free writing prospectus differ from any of the terms described in this prospectus, the description of such terms and conditions set forth in this prospectus shall be deemed to have been superseded or supplemented by the description of such differing terms and conditions set forth in such prospectus supplement or applicable free writing prospectus with respect to such warrants.

LIMITATIONS AFFECTING SHAREHOLDERS OF A FRENCH COMPANY

Ownership of ADSs or Shares by Non-French Residents

Neither the French Commercial Code nor our by-laws presently impose any restrictions on the right of non- French residents or non-French shareholders to own and vote shares.

However, any investment:

(i) by (a) any non-French citizen, (b) any French citizen not residing in France, (c) any non-French entity or (d) any French entity controlled by one of the aforementioned persons or entities;

(ii) that will result in the relevant investor (a) acquiring control of an entity registered in France, (b) acquiring all or part of a business line of an entity registered in France, or (c) for non-EU or non-EEA investors crossing, directly or indirectly, alone or in concert, a 25% threshold of voting rights in an entity registered in France; and

(iii) developing activities in certain strategic industries related to (a) activity likely to prejudice national defense interests, participating in the exercise of official authority or are likely to prejudice public policy and public security (including weapons, double-use items, IT systems, cryptology, date capturing devices, gambling, toxic agents or storage of data), (b) activities relating to essential infrastructure, goods or services (including energy, water, transportation, space, telecom, public health, farm products, media, and critical raw materials), and (c) research and development activity related to critical technologies (including cybersecurity, artificial intelligence, robotics, additive manufacturing, semiconductors, quantum technologies, energy storage, biotechnologies, low carbon energy or photonics) or dual-use items, is subject to the prior authorization of the French Minister of Economy, which authorization may be conditioned on certain undertakings.

The Decree (décret) n° 2023-1293 of December 28, 2023 made permanent the temporary regime under Decree (décret) n° 2020-892 dated July 22, 2020, as amended on December 28, 2020 by the Decree (décret) n° 2020-1729, on December 22, 2021 by the Decree (décret) n° 2021-1758, and on December 23, 2022 by the Decree (décret) n° 2022-1622, creating a new 10% threshold of the voting rights for the non-European investments made (i) in an entity with its registered office in France and (ii) whose shares are admitted to trading on a French-, EU- or EEA-regulated market, in addition to the 25% above-mentioned threshold. A fast-track procedure shall apply for any non-European investor exceeding this 10% threshold who will have to notify the Minister of Economy who will then have 10 days to decide whether or not the transaction should be subject to further examination.

If an investment requiring the prior authorization of the French Minister of Economy is completed without such authorization having been granted, the relevant investment shall be deemed null and void and the French Minister of Economy further might direct the relevant investor to nonetheless (i) submit a request for authorization, (ii) have the previous situation restored at its own expense or (iii) amend the investment. The relevant investor further may be found criminally liable and may be sanctioned with a fine not to exceed the greater of the following amounts: (i) twice the amount of the relevant investment, (ii) 10% of the annual turnover before tax of the target company or (iii) €5 million (for a company) or €1 million (for a natural person).

Further, (a) any non-French citizen, (b) any French citizen not residing in France, (c) any non-French entity or (d) any French entity controlled by one of the aforementioned persons or entities may have to file a declaration for statistical purposes with the Bank of France (Banque de France) within twenty (20) working days following the settlement date of certain direct foreign investments in us, including any purchase of our ADSs. In particular, such filings are required in connection with investments exceeding €15,000,000 that lead to the acquisition of at least 10% of our Company’s share capital or voting rights or cross such 10% threshold. Violation of this filing requirement may be sanctioned by five years of imprisonment and a fine of up to twice the amount of the relevant investment. This amount may be increased fivefold if the violation is made by a legal entity.

Foreign Exchange Controls

Under current French foreign exchange control regulations there are no limitations on the amount of cash payments that we may remit to residents of foreign countries. Laws and regulations concerning foreign exchange controls do, however, require that all payments or transfers of funds made by a French resident to a non-resident such as dividend payments be handled by an accredited intermediary. All registered banks and substantially all credit institutions in France are accredited intermediaries.

Availability of Preferential Subscription Rights

In accordance with French law, our shareholders have preferential subscription rights to subscribe for new shares or other securities giving rights to acquire additional shares on a pro rata basis, as described under the section of this prospectus titled “Description of Share Capital and By-laws—Key Provisions of Our By-laws and French Law Affecting Our Ordinary Shares—Changes in Share Capital—Preferential Subscription Rights.” Holders of our securities in the U.S. (which may be in the form of shares or ADSs) may not be able to exercise preferential subscription rights for their securities unless a registration statement under the Securities Act is effective with respect to such rights or an exemption from the registration requirements imposed by the Securities Act is available. We may, from time to time, issue new shares or other securities giving rights to acquire additional shares (such as warrants) at a time when no registration statement is in effect and no Securities Act exemption is available. If so, holders of our securities in the U.S. will be unable to exercise any preferential subscription rights and their interests will be diluted. We are under no obligation to file any registration statement in connection with any issuance of new shares or other securities. We intend to evaluate at the time of any rights offering the costs and potential liabilities associated with registering the rights, as well as the indirect benefits to us of enabling the exercise by holders of shares and holders of ADSs in the U.S. of the subscription rights, and any other factors we consider appropriate at the time, and then to make a decision as to whether to register the rights. We cannot assure you that we will file a registration statement.

For holders of our ordinary shares in the form of ADSs, the depositary may make these rights or other distributions available to ADS holders. If the depositary does not make the rights available to ADS holders and determines that it is impractical to sell the rights, it may allow these rights to lapse. In that case the holders will receive no value for them. The section of this prospectus titled “Description of American Depositary Shares—Dividends and Distributions” explains in detail the depositary’s responsibility in connection with a rights offering.

ENFORCEMENT OF CIVIL LIABILITIES

We are a corporation organized under the laws of France. The majority of our directors are citizens and residents of countries other than the United States, and the majority of our assets are located outside of the United States. Accordingly, it may be difficult for investors:

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to obtain jurisdiction over us or our non-U.S. resident officers and directors in U.S. courts in actions predicated on the civil liability provisions of the U.S. federal securities laws;

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to enforce judgments obtained in such actions against us or our non-U.S. resident officers and directors;

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to bring an original action in a French court to enforce liabilities based upon the U.S. federal securities laws against us or our non-U.S. resident officers or directors; and

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to enforce against us or our directors in non-U.S. courts, including French courts, judgments of U.S. courts predicated upon the civil liability provisions of the U.S. federal securities laws.

Nevertheless, a final judgment for the payment of money rendered by any federal or state court in the United States based on civil liability, whether or not predicated solely upon the U.S. federal securities laws, would be recognized and enforced in France provided that a French judge considers that this judgment meets the requirements under the French rules of international private law concerning the recognition and the enforcement of foreign judgments and is capable of being immediately enforced in the United States. A French court is therefore likely to grant the enforcement of a foreign judgment without a review of the substantive matters thereby adjudicated, only if (1) the United States federal or state court has jurisdiction and the dispute is clearly connected to the territory of the court which rendered the judgement, (2) the judgment is not tainted by fraud, (3) the judgment complies with French substantive and procedural rules of international public policy (ordre public international), including principles of due process (principe du contradictoire) and notably the right to a fair trial, and (4) the judgment is not irreconcilable with an earlier judgment rendered or recognized by a French court in the same or related matter. The French court may require all relevant supporting documents to be translated into the French language by a “sworn translator” (traducteur assermenté) as a condition to their admissibility into evidence or for purposes of enforcement.

In addition, French law guarantees full compensation for the harm suffered but is limited to the actual damages, so that the victim does not suffer or benefit from the situation. Such system excludes damages such as punitive and exemplary damages.

As a result, the enforcement, by U.S. investors, of any judgments obtained in U.S. courts in civil and commercial matters, including judgments under the U.S. federal securities law against us or members of our board of directors, officers or certain experts named herein who are residents of France or countries other than the United States would be subject to the above conditions.

Finally, there may be doubt as to whether a French court would impose civil liability on us, the members of our board of directors, our officers or certain experts named herein in an original action predicated solely upon the U.S. federal securities laws brought in a court of competent jurisdiction in France against us or such members, officers or experts, respectively.

TAXATION

Certain material French and U.S. federal income tax consequences relating to the purchase, ownership and disposition of any of the securities offered by this prospectus will be set forth in the prospectus supplement pertaining to those securities.

LEGAL MATTERS

Unless otherwise indicated in any prospectus supplement, Gide Loyrette Nouel A.A.R.P.I will pass upon the validity of the ordinary shares, including ordinary shares represented by ADSs, and warrants to be offered and other legal matters relating to French law, including matters of French income tax law, in connection with any offering. Any underwriters will be advised about other issues relating to any offering by their own legal counsel. Unless otherwise indicated in any prospectus supplement, Cooley LLP, New York, New York, will be representing us in regards to certain matters governed by U.S. law and the validity of certain of the offered securities in connection with any offering. Additional legal matters may be passed upon for any underwriters, dealers or agents by counsel that we will name in the applicable prospectus supplement.

EXPERTS

The consolidated financial statements of DBV Technologies SA. as of December 31, 2025 and 2024 and for each of the years in the two-year period ended December 31, 2025, have been incorporated herein by reference to DBV Technologies’ Annual Report on Form 10-K for the year ended December 31, 2025 in reliance upon the report of Deloitte & Associés and KPMG S.A., independent registered public accounting firms, incorporated by reference herein, and upon the authority of such firms as experts in auditing and accounting.

The offices of Deloitte & Associés are located at 6, place de la Pyramide, 92908 Paris-la-Défense Cedex, Puteaux, France.

The offices of KPMG S.A. are located at 2, avenue Gambetta, CS 60055, 92066 Paris-la-Défense, France.

WHERE YOU CAN FIND MORE INFORMATION

This prospectus is part of a registration statement we filed with the SEC. This prospectus does not contain all of the information set forth in the registration statement and the exhibits to the registration statement. For further information with respect to us and the securities we are offering under this prospectus, we refer you to the registration statement and the exhibits and schedules filed as a part of the registration statement. Neither we nor any agent, underwriter or dealer has authorized any person to provide you with different information. We are not making an offer of these securities in any state where the offer is not permitted. You should not assume that the information in this prospectus is accurate as of any date other than the date on the front page of this prospectus, regardless of the time of delivery of this prospectus or any sale of the securities offered by this prospectus.

We file annual, quarterly and current reports, proxy statements and other information with the SEC. Our SEC filings are available to the public at the SEC’s website at www.sec.gov. You also may access these filings on our website at www.dbv-technologies.com. We do not incorporate the information on our website into this prospectus or any supplement to this prospectus and you should not consider any information on, or that can be accessed through, our website as part of this prospectus or any supplement to this prospectus (other than those filings with the SEC that we specifically incorporate by reference into this prospectus or any supplement to this prospectus).

INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The SEC allows us to “incorporate by reference” information into this prospectus, which means that we can disclose important information to you by referring you to another document filed separately with the SEC. The SEC file number for the documents incorporated by reference in this prospectus is 001-36697. The documents incorporated by reference into this prospectus contain important information that you should read about us.

This prospectus and any accompanying prospectus supplement incorporate by reference the documents set forth below that have previously been filed with the SEC:

•

Our Annual Report on Form 10-K for the fiscal year ended December 31, 2025, filed with the SEC on March 26, 2026;

•

the Part III information in our Annual Report on Form 10-K for the year ended December 31, 2025, included in the Form 10-K/A filed with the SEC on April 30, 2026;

•

Our Quarterly Report on Form 10-Q for the quarters ended March 31, 2026 and June 30, 2026, filed with the SEC on April 30, 2026 and July 16, 2026,

•

Our Current Reports on Form 8-K filed with the SEC on January 20, 2026, March 2, 2026, May 5, 2026, June 3, 2026, June 5, 2026, and June 29, 2026 (in each case, except for information contained therein which is furnished rather than filed); and

•

The description of our ordinary shares and ADSs contained in our Registration Statement on Form 8-A, which was filed with the SEC on October 17, 2014, as updated by Exhibit 4.5 of our Form 10-K/A filed with the SEC on April 30, 2026, including any amendments or reports filed for the purposes of updating such description.

We also incorporate by reference into this prospectus all documents (other than current reports furnished under Item 2.02 or Item 7.01 of Form 8-K and exhibits filed on such form that are related to such items) that are filed by us with the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this prospectus but prior to the termination of the offering.

Unless expressly incorporated by reference, nothing in this prospectus shall be deemed to incorporate by reference information furnished to, but not filed with, the SEC. We will provide to each person, including any beneficial owner, to whom a prospectus is delivered, without charge upon written or oral request, a copy of any or all of the documents that are incorporated by reference into this prospectus but not delivered with the prospectus, including exhibits that are specifically incorporated by reference into such documents. You should direct any requests for documents, either in writing to Corporate Secretary, c/o DBV Technologies S.A., 107 Avenue de la République, 92320 Châtillon, France or by telephone at +33 1 55 42 78 78.

In addition, copies of the documents incorporated herein by reference may be accessed at our website at www.dbv-technologies.com. The reference to our website address does not constitute incorporation by reference of the information contained on or accessible through our website, and you should not consider the contents of our website in making an investment decision with respect to our ADSs.

Any statement contained in this prospectus or contained in a document incorporated or deemed to be incorporated by reference into this prospectus will be deemed to be modified or superseded to the extent that a statement contained in this prospectus or any subsequently filed supplement to this prospectus, or document deemed to be incorporated by reference into this prospectus, modifies or supersedes such statement.

PROSPECTUS SUPPLEMENT

Up to $150,000,000 of Ordinary Shares

LOGO

American Depositary Shares

We have previously entered into a sales agreement, or the Sales Agreement, with Citizens JMP Securities, LLC, or Citizens, relating to the sale of American Depositary Shares, or ADSs, each ADS representing five ordinary shares, nominal value €0.10 per share. In accordance with the terms of the Sales Agreement, we may offer and sell ADSs from time to time through Citizens, acting as sales agent.

We have previously sold an aggregate of 4,790,552 ADSs for aggregate gross proceeds of approximately $64.8 million pursuant to the Sales Agreement and an effective Registration Statement on Form S-3 (File No. 333-271166), or Prior Registration Statement, filed with the Securities and Exchange Commission, or SEC, on April 6, 2023, and a prospectus supplement to the Prior Registration Statement, filed with the SEC on September 5, 2025. As of the date of this prospectus supplement, we will not make any further offers or sales of our ADSs pursuant to the Prior Registration Statement, which expired on April 17, 2026.

Under this prospectus supplement, and in accordance with the terms of the Sales Agreement, we may offer and sell up to an additional $150,000,000 ADSs from and after the date hereof.

Our ordinary shares in the form of ADSs are listed on the Nasdaq Capital Market, or Nasdaq, under the symbol “DBVT.” On July 23, 2026, the last reported sale price of the ADSs on Nasdaq was $13.86 per ADS. Our ordinary shares are traded on the regulated market of Euronext in Paris, or Euronext Paris, under the symbol “DBV.” On July 23, 2026, the last reported sale price of our ordinary shares on Euronext Paris was €2.374 per share.

Sales of our ADSs, if any, under this prospectus supplement may be made in sales deemed to be an “at the market offering” as defined in Rule 415(a)(4) promulgated under the Securities Act of 1933, as amended, or the Securities Act, from time to time. Citizens is not required to sell any specific number or dollar amount of securities, but will act as sales agent and has agreed to use commercially reasonable efforts to arrange on our behalf for the sale of all ADSs requested to be sold by us, consistent with its normal sales practices, on mutually agreed terms between us and Citizens. There is no arrangement for funds to be received in any escrow, trust or similar arrangement.

Citizens will be entitled to compensation under the terms of the Sales Agreement at a commission rate equal to 3.0% of the gross sales price per ADS sold under the Sales Agreement. In connection with the sale of the ADSs on our behalf, Citizens will be deemed to be an “underwriter” within the meaning of the Securities Act, and the compensation of Citizens will be deemed to be underwriting commissions or discounts. We have agreed to provide indemnification and contribution to Citizens with respect to certain liabilities, including liabilities under the Securities Act. See “Plan of Distribution” beginning on page S-19 of this prospectus supplement for additional information regarding the compensation to be paid to Citizens.

The net proceeds from any sales under this prospectus supplement will be used as described under the section entitled “Use of Proceeds.” The proceeds we receive from sales of our ADSs, if any, will depend on the number of ADSs actually sold and the offering price of such ADSs.

Under the authority granted by our shareholders, pursuant to the 25th resolution adopted by the 2026 Annual Combined General Meeting of Shareholders held on June 3, 2026, or the 2026 Annual General Meeting, the ADSs we are offering may only be purchased by: (i) natural person(s) or legal entity(ies), including companies, trusts, investment funds or other investment vehicle(s), regardless of their form, under French or foreign law, investing on a regular basis in the pharmaceutical, biotechnological or medical technology sector; and/or (ii) French or foreign companies, institutions or entities of any form, carrying out a significant portion of their business in the pharmaceutical or chemical sector or in the field of medical devices and/or technologies or research in these areas.

We are a “smaller reporting company” under the federal securities laws and, as such, are subject to reduced public company reporting requirements. See “Prospectus Supplement Summary—Implications of Being a Smaller Reporting Company.”

Investing in our securities involves a high degree of risk. See “Risk Factors” beginning on page S-9 of this prospectus supplement and other similar headings in the other documents that are incorporated by reference into this prospectus supplement for risks and uncertainties you should consider before you make your investment decision.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement is truthful or complete. Any representation to the contrary is a criminal offense.

Citizens Capital Markets

The date of this prospectus supplement is July 27, 2026.

TABLE OF CONTENTS

Prospectus Supplement


	Page
ABOUT THIS PROSPECTUS SUPPLEMENT		S-1
PRESENTATION OF FINANCIAL AND OTHER INFORMATION		S-2
SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS		S-3
PROSPECTUS SUPPLEMENT SUMMARY		S-5
RISK FACTORS		S-9
USE OF PROCEEDS		S-16
DILUTION		S-17
PLAN OF DISTRIBUTION		S-19
TAXATION		S-21
LEGAL MATTERS		S-30
EXPERTS		S-30
WHERE YOU CAN FIND MORE INFORMATION		S-31
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE		S-32

We have not authorized anyone to provide any information other than that contained in this prospectus supplement. We take no responsibility for, and provide no assurances as to the reliability of, any other information that others may give you.

S-i

ABOUT THIS PROSPECTUS SUPPLEMENT

This prospectus supplement is part of an automatic shelf registration statement that we have filed with the SEC using a “shelf” registration process. By using a shelf registration process, we may offer ADSs having an aggregate offering price of up to $150,000,000 from time to time under this prospectus supplement at prices and on terms to be determined by market conditions at the time of offering.

We provide information to you about this offering of our ADSs in two separate documents that are bound together: (1) this prospectus supplement, which describes the specific details regarding this offering; and (2) the accompanying base prospectus, which provides general information, some of which may not apply to this offering. Generally, when we refer to this “prospectus supplement,” we are referring to both documents combined. If information in this prospectus supplement is inconsistent with the accompanying base prospectus, you should rely on this prospectus supplement. To the extent there is a conflict between the information contained in this prospectus supplement, on the one hand, and the information contained in any document incorporated by reference into this prospectus supplement that was filed with the SEC before the date of this prospectus supplement, on the other hand, you should rely on the information in this prospectus supplement.

This prospectus supplement, the accompanying prospectus and the documents incorporated by reference into each include important information about us, the ADSs being offered and other information that you should know before investing in our ADSs. You should also read and consider information in the documents we have referred you to in the sections of this prospectus supplement and the accompanying prospectus entitled “Incorporation of Certain Information by Reference” and “Where You Can Find More Information.”

You should assume that the information in this prospectus supplement and the accompanying prospectus is accurate only as of the date on the front of the respective document and that any information that we have incorporated by reference is accurate only as of the date of the document incorporated by reference, regardless of the time of delivery of this prospectus supplement or the accompanying prospectus or the time of any sale of an ADS. Our business, financial condition, liquidity, results of operations and prospects may have changed since those dates.

This prospectus supplement and the accompanying prospectus contain summaries of certain provisions contained in some of the documents described herein, but reference is made to the actual documents for complete information. All of the summaries are qualified in their entirety by the actual documents. Copies of some of the documents referred to herein have been filed, will be filed or will be incorporated by reference herein as exhibits to the registration statement, and you may obtain copies of those documents as described below under the sections entitled “Incorporation of Certain Information by Reference” and “Where You Can Find More Information.”

We further note that the representations, warranties and covenants made by us in any agreement that is filed as an exhibit to any document that is incorporated by reference herein were made solely for the benefit of the parties to such agreement, including, in some cases, for the purpose of allocating risk among the parties to such agreements, and should not be deemed to be a representation, warranty or covenant to you. Moreover, such representations, warranties or covenants were accurate only as of the date when made. Accordingly, such representations, warranties and covenants should not be relied on as accurately representing the current state of our affairs.

Neither we nor Citizens are making offers to sell or solicitations to buy our ADSs in any jurisdiction in which an offer or solicitation is not permitted or in which the person making that offer or solicitation is not qualified to do so or to anyone to whom it is unlawful to make an offer or solicitation.

For investors outside the United States: Neither we nor Citizens have done anything that would permit this offering or possession or distribution of this prospectus supplement in any jurisdiction where action for that purpose is required, other than in the United States. Persons outside the United States who come into possession of this prospectus supplement must inform themselves about, and observe any restrictions relating to, the offering of the securities described herein and the distribution of this prospectus supplement outside the United States.

S-1

PRESENTATION OF FINANCIAL AND OTHER INFORMATION

Unless otherwise indicated or the context otherwise requires, references in this prospectus supplement to “DBV,” “the company,” “our company,” “we,” “us,” and “our” refer to DBV Technologies S.A. and our consolidated subsidiaries. All references in this prospectus supplement, the accompanying prospectus and the documents incorporated by reference herein to “$” and “U.S. dollars” mean U.S. dollars and all references to “€” and “euros,” mean euros. Throughout this prospectus supplement, references to ADSs mean ADSs or ordinary shares represented by such ADSs, as the case may be.

We prepare our consolidated financial statements in accordance with generally accepted accounting principles in the United States, or U.S. GAAP. Our consolidated financial statements are presented in U.S. dollars.

“Viaskin^®”, “DBV Technologies^®”, “Abyldis^®”, our corporate logo and our other registered and common law trade names, trademarks and service marks are the property of DBV Technologies S.A. or our subsidiaries. All other trademarks, trade names and service marks appearing in this prospectus supplement or the documents incorporated by reference herein are the property of their respective owners. Solely for convenience, the trademarks and trade names in this prospectus supplement and the documents incorporated by reference herein may be referred to without the ^® and ^™ symbols, but such references should not be construed as any indicator that their respective owners will not assert their rights thereto.

S-2

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This prospectus supplement, the accompanying prospectus and the information incorporated by reference in this prospectus supplement and the accompanying prospectus contain forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act, that involve a number of risks and uncertainties. Although our forward-looking statements reflect the good faith judgment of our management, these statements can only be based on facts and factors currently known by us. Consequently, these forward-looking statements are inherently subject to risks and uncertainties, and actual results and outcomes may differ materially from results and outcomes discussed in the forward-looking statements.

All statements other than present and historical facts and conditions contained in this prospectus supplement, the accompanying prospectus and the information incorporated by reference in this prospectus supplement and the accompanying prospectus including statements regarding our future results of operations and financial positions, business strategy, plans and our objectives for future operations, are forward-looking statements. The words “anticipate,” “believe,” “can,” “could,” “estimate,” “expect,” “intend,” “is designed to,” “may,” “might,” “plan,” “potential,” “predict,” “objective,” “should,” or the negative of these and similar expressions identify forward-looking statements. Forward-looking statements include, but are not limited to, statements about:

•

our expectations with respect to an actionable regulatory pathway, including an Accelerated Approval pathway, for toddlers ages 1-3 years-old for the Viaskin Peanut patch;

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our expectations regarding initiation of the confirmatory effectiveness study for Viaskin Peanut patch in 1 – 3 years-old;

•

anticipated support for the BLA re-submission for the Viaskin Peanut patch to FDA;

•

the timing and anticipated results of interactions with regulatory agencies;

•

the design, initiation, timing, progress and results of our pre-clinical studies and clinical trials, and our research and development programs;

•

the sufficiency of existing capital resources;

•

our business model and our other strategic plans for our business, product candidates and technology;

•

the ability of our sole contract manufacturer for Viaskin Peanut patches to successfully remediate Good Manufacturing Practice deficiencies in response to FDA warning letters;

•

our ability to build our own sales and marketing capabilities, or seek collaborative partners, to commercialize the Viaskin Peanut patch and/or our other product candidates, if approved;

•

the commercialization of our product candidates, if approved;

•

the pricing and reimbursement of our product candidates, if approved;

S-3

•

the rate and degree of market acceptance of the Viaskin Peanut patch and/or our other product candidates, if approved, by physicians, patients, third-party payors and others in the medical community;

•

our ability to advance product candidates into, and successfully complete, clinical trials;

•

the scope of protection we are able to establish and maintain for intellectual property rights covering our product candidates and technology;

•

estimates of our expenses, future revenues, capital requirements and our needs for additional financing;

•

the potential benefits of strategic collaboration agreements and our ability to enter into strategic arrangements;

•

our ability to maintain and establish collaborations or obtain additional funding;

•

our future financial performance;

•

developments relating to our competitors and our industry, including competing therapies;

•

plans and expectations with respect to use of proceeds from this offering combined with our current operating capital, to fund operations; and

•

other risks and uncertainties, including those listed under the caption “Risk Factors” in this prospectus supplement, the accompanying prospectus and the information incorporated by reference in this prospectus supplement and the accompanying prospectus.

As a result of these factors, we cannot assure you that the forward-looking statements in this prospectus supplement, the accompanying prospectus and in the information incorporated by reference in this prospectus supplement and the accompanying prospectus will prove to be accurate. Furthermore, if our forward-looking statements prove to be inaccurate, the inaccuracy may be material. In light of the significant uncertainties in these forward-looking statements, you should not regard these statements as a representation or warranty by us or any other person that we will achieve our objectives and plans in any specified time frame or at all. We undertake no obligation to publicly update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

You should read this prospectus supplement, the accompanying prospectus and the information incorporated by reference in this prospectus supplement and the accompanying prospectus completely and with the understanding that our actual future results may be materially different from what we expect. We qualify all of our forward-looking statements by these cautionary statements.

This prospectus supplement, the accompanying prospectus and the information incorporated by reference in this prospectus supplement and the accompanying prospectus may contain market data and industry forecasts that were obtained from industry publications. These data involve a number of assumptions and limitations, and you are cautioned not to give undue weight to such estimates. While we believe the market position, market opportunity and market size information included in this prospectus supplement, the accompanying prospectus and in the information incorporated by reference in this prospectus supplement and the accompanying prospectus is generally reliable, such information is inherently imprecise.

In addition, statements that “we believe” and similar statements reflect our beliefs and opinions on the relevant subject. These statements are based upon information available to us as of the date of this prospectus, and while we believe such information forms a reasonable basis for such statements, and our management is responsible for the accuracy of such information, such information may be limited or incomplete, and our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of, all potentially available relevant information.

S-4

PROSPECTUS SUPPLEMENT SUMMARY

This summary highlights selected information about us, this offering and selected information contained elsewhere in or incorporated by reference into this prospectus supplement. This summary is not complete and does not contain all of the information that you need to consider in making your investment decision. We encourage you to read this prospectus supplement and the accompanying prospectus, including the information incorporated by reference into this prospectus supplement and the accompanying prospectus, in their entirety.

Overview

We are a late stage specialty biopharmaceutical company focused on changing the field of immunotherapy by developing a novel technology platform called Viaskin. Our therapeutic approach is based on epicutaneous immunotherapy, our proprietary method of delivering biologically active compounds to the immune system through intact skin using Viaskin, an epicutaneous patch (i.e., a skin patch). We have generated significant data demonstrating that Viaskin’s mechanism of action is novel and differentiated, Viaskin targets specialized antigen-presenting immune cells in the skin, called Langerhans cells, that capture the antigen that accumulates in the outer layer of the skin, and then migrate to the skin-draining lymph nodes in order to activate the immune system without passage of the antigen into the bloodstream, minimizing systemic exposure in the body. We are advancing this unique technology to treat children suffering from food allergies, for whom safety is paramount, since the introduction of the offending allergen into their bloodstream can cause severe or life-threatening allergic reactions, such as anaphylactic shock. We believe Viaskin may offer convenient, self-administered, non-invasive immunotherapy to patients, if approved.

Corporate Information

Our legal and commercial name is DBV Technologies S.A. We were incorporated as a société par actions simplifiée under the laws of the French Republic on March 29, 2002 for a period of 99 years and subsequently converted on March 13, 2003 into a société anonyme, or S.A. We are registered at the Nanterre Commerce and Companies Register under the number 441 772 522. Our principal executive offices are located at 107 avenue de la République, 92320 Châtillon, France and our telephone number is +33 1 55 42 78 78. Our agent for service of process in the United States is DBV Technologies Inc. We maintain a corporate website at www.dbv-technologies.com. Information contained on, or that can be accessed through, our website does not constitute a part of this prospectus supplement or the accompanying prospectus. We have included our website address in this prospectus supplement solely as an inactive textual reference.

Our ordinary shares in the form of ADSs have been listed on the Nasdaq Capital Market under the symbol “DBVT” since June 20, 2024. Prior to June 20, 2024, our ordinary shares in the form of ADSs had been listed on the Nasdaq Global Select Market under the symbol “DBVT” since October 22, 2014. Our ordinary shares have been trading on Euronext Paris under the symbol “DBV” since March 28, 2012. Additionally, on November 29, 2024, we implemented an ADS ratio change to our current ratio of one (1) ADS to five (5) ordinary shares.

Implications of Being a Smaller Reporting Company

We are a “smaller reporting company” as defined in the Exchange Act. We may take advantage of certain scaled disclosures available to smaller reporting companies and will be able to take advantage of these scaled

S-5

down disclosures for so long as (i) our voting and non-voting ordinary shares held by non-affiliates are less than $250.0 million measured as of June 30th of such fiscal year or (ii) our annual revenue is less than $100.0 million during the most recently completed fiscal year and our voting and non-voting ordinary shares held by non-affiliates is less than $700.0 million measured as of June 30th of such fiscal year. Based on the aggregate worldwide market value of our voting and non-voting common equity held by our non-affiliates as of June 30, 2026, we will be deemed a “large accelerated filer” as of the end of our fiscal year 2026. We will therefore cease being a smaller reporting company on December 31, 2026.

S-6

THE OFFERING

Securities Offered By Us

ADSs, each ADS representing five ordinary shares, having an aggregate offering price of up to $150,000,000 and representing, together with all the other ordinary shares which have been admitted to trading on Euronext Paris without a French listing prospectus or an exemption document, over a rolling period of 12 months, less than 30% of the number of securities of the same class already admitted to trading on Euronext Paris.

Plan of Distribution

Sales deemed to be an “at the market offering” as defined in Rule 415(a)(4) promulgated under the Securities Act from time to time through our sales agent, Citizens. See “Plan of Distribution” on page S-19 of this prospectus supplement.

Purchaser Restrictions

Under the authority granted by our shareholders, pursuant to the 25th resolution adopted by the 2026 Annual General Meeting, the ADSs we are offering may only be purchased by: (i) natural person(s) or legal entity(ies), including companies, trusts, investment funds or other investment vehicle(s), regardless of their form, under French or foreign law, investing on a regular basis in the pharmaceutical, biotechnological or medical technology sector; and/or (ii) French or foreign companies, institutions or entities of any form, carrying out a significant portion of their business in the pharmaceutical or chemical sector or in the field of medical devices and/or technologies or research in these areas. In order to purchase ADSs in the offering, you will be required to execute and provide an investor letter representing that you satisfy the foregoing investor criteria.

American Depositary Shares

Each ADS represents five ordinary shares, nominal value €0.10 per share. You will have the rights of an ADS holder as provided in the deposit agreement among us, the depositary and all holders and beneficial owners of ADSs issued thereunder. To better understand the terms of the ADSs, you should carefully read the section in the accompanying prospectus titled “Description of American Depositary Shares.” We also encourage you to read the deposit agreement incorporated by reference into the registration statement of which this prospectus supplement forms a part.

Depositary and Custodian

Citibank, N.A. and Citibank Europe plc, respectively.

Use of Proceeds

We intend to use the net proceeds of any offering of securities primarily for activities associated with manufacturing expansion, our BLAs in ages 4 through 7 and 1 through 3, launch preparation of Viaskin Peanut in ages 4-7, if approved, development of our product candidates, and for working capital and other general corporate purposes. See “Use of Proceeds” on page S-16 of this prospectus supplement.

S-7

Risk Factors

Before deciding whether to invest in our ADSs, you should carefully consider the risks described under “Risk Factors” beginning on page S-9 of this prospectus supplement, as well as the other information included or incorporated by reference into this prospectus supplement and the accompanying prospectus, including our financial statements and the notes thereto.

The Nasdaq Capital Market Symbol

DBVT

Except as otherwise noted, in this prospectus supplement the number of ordinary shares that will be outstanding after this offering is based on 296,061,497 ordinary shares outstanding (including treasury shares and including ordinary shares represented by ADSs) as of June 30, 2026, and excludes the following:

•

142,647,271 ordinary shares issuable upon the exercise of pre-funded warrants to purchase ordinary shares, outstanding as of June 30, 2026;

•

87,008 ordinary shares issuable upon the exercise of share warrants (Bons de souscription d’actions, or BSA) outstanding as of June 30, 2026;

•

9,919,060 restricted stock units, which we also refer to as free shares (Actions gratuites), for which the vesting period had not yet expired and/or are subject to the achievement of performance conditions as of June 30, 2026; and

•

15,067,578 ordinary shares issuable upon the exercise of stock options outstanding as of June 30, 2026.

As of June 30, 2026, a total of 31,467,378 ordinary shares remained available for issuance under our equity incentive compensation plans pursuant to delegations of authority from our shareholders approved on June 3, 2026 (resolutions n°33 to 37 (included)).

As of June 30, 2026, 296,042,440 ordinary shares remained reserved for issuance pursuant to delegations of authority from our shareholders approved on June 3, 2026 for share capital increases by us, up to an aggregate maximum nominal amount equal to €29,604,244 through rights issuances, private offerings and public offerings, including this offering (resolution n°31).

Unless otherwise indicated, all information contained in this prospectus supplement assumes no exercise of outstanding options, warrants or pre-funded warrants or vesting of restricted stock units, vesting of free ordinary shares or other equity awards or conversion of preferred shares subsequent to June 30, 2026.

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RISK FACTORS

Investing in our ADSs involves a high degree of risk. Before deciding whether to invest in our ADSs, you should consider carefully the risks discussed under the section captioned “Risk Factors” contained in our Annual Report on Form 10-K, filed with the SEC on March 26, 2026, and in our Quarterly Report on Form 10-Q, filed with the SEC on July 16, 2026, each incorporated by reference in this prospectus supplement and the accompanying base prospectus, together with the other information in this prospectus supplement and the accompanying base prospectus, the other documents incorporated by reference herein and therein, and in any free writing prospectus that we have authorized for use in connection with this offering. If any of these risks actually occur, our business, financial condition, results of operations or prospects could be seriously harmed. This could cause the trading price of our ADSs to decline, resulting in a loss of all or part of your investment. The risks and uncertainties we have described are not the only ones we face. Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also affect our operations. Please also read carefully the section below entitled “Special Note Regarding Forward-Looking Statements.”

Risks Related to This Offering

If you purchase ADSs in this offering, you may experience substantial and immediate dilution as well as potential future dilution.

The offering price per ADS in any transaction that is a part of this offering may exceed the net tangible book value per ADS outstanding prior to this offering. Assuming that an aggregate of 10,822,510 ADSs are sold at a price of $13.86 per ADS (equivalent to aggregate gross proceeds of $150.0 million), which was the last reported sale price of our ADSs on July 23, 2026 on Nasdaq, then after deducting commissions and estimated offering expenses of $4.5 million payable by us, our as adjusted net tangible book value as of June 30, 2026 would have been $305.9 million, or $4.37 per ADS, and you would experience immediate dilution of $9.49 per ADS, representing the difference between our as adjusted net tangible book value per ADS as of June 30, 2026, after giving effect to this offering, and the assumed offering price.

You will also experience additional dilution at the end of the vesting period for our free shares that we have granted and upon exercise of any outstanding employee or non-employee warrants, pre-funded warrants or stock options to purchase ordinary shares. We have also reserved ordinary shares for future issuance under our equity incentive plans, and the issuance of additional equity compensation awards may result in further dilution.

In addition, in order to raise additional capital, we may in the future offer additional ordinary shares or ADSs or other securities convertible into or exchangeable for our ordinary shares, which may result in further dilution. There is no assurance that the offering price in any other offering will be equal to or greater than the price at which you purchase ADSs in this offering, and investors purchasing shares or other securities in the future could have rights superior to existing shareholders. Because the sales of ADSs offered hereby will be made at other than a fixed price, the prices at which we sell these ADSs may vary significantly. Purchasers of the ADSs we sell, as well as our existing shareholders and holders of ADSs, will experience significant dilution if we sell additional ADSs at prices significantly below the price at which they invested.

For a further description of the dilution that you will experience immediately after this offering, see the section of this prospectus supplement titled “Dilution.”

Future sales of ordinary shares or ADSs by existing shareholders could depress the market price of our ordinary shares and ADSs.

As of July 23, 2026, 296,085,697 ordinary shares were issued and outstanding, which number includes treasury shares. Sales of a substantial number of shares of our ordinary shares or ADSs in the public market, or the perception that these sales might occur, could depress the market price of our securities and could impair our

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ability to raise capital through the sale of additional equity securities. A substantial number of our shares are freely tradable, subject, in the case of sales by our affiliates, to the volume limitations and other provisions of Rule 144 under the Securities Act. If holders of these shares sell, or indicate an intent to sell, substantial amounts of our securities in the public market, the trading price of our securities could decline significantly.

In addition, to the extent that holders of pre-funded warrants exercise such warrants and sell the ordinary shares issued upon such exercise, the market price of the ordinary shares and ADSs may decrease due to the additional selling pressure in the market.

We have also filed a registration statement with the SEC to register the ordinary shares that may be issued under our equity incentive plans. The ordinary shares subject to outstanding options under our equity incentive plans, ordinary shares reserved for future issuance under our equity incentive plans and ordinary shares subject to outstanding warrants will become eligible for sale in the public market in the future, subject to certain legal and contractual limitations. Sales of a large number of the shares issued under these plans in the public market could have an adverse effect on the market price of our securities.

You may not be able to enforce civil liabilities against us if certain conditions are not met.

We are incorporated in France, but a majority of our outstanding securities are owned by U.S. residents. A number of our officers and directors as well as our subsidiaries are non-residents of the United States, and all or a substantial portion of the assets of such persons are located outside the United States. As a result, you may not be able to effect service of process within the United States upon such non-U.S. persons or to enforce judgments outside the United States against them, including judgments obtained in U.S. courts predicated upon the civil liability provisions of the federal securities laws of the United States. We have been advised by our French counsel that the enforceability in France in original actions, or in actions for enforcement of judgments of U.S. courts, of civil liabilities to the extent predicated upon the federal securities laws of the United States would be subject to conditions as described under “Enforcement of Civil Liabilities” in the accompanying prospectus.

In addition, awards of punitive damages in actions brought in the United States or elsewhere may be unenforceable in France. An award for monetary damages under the U.S. securities laws would be considered punitive if it does not seek to compensate the claimant for loss or damage suffered but is intended to punish the defendant. French law provides that a shareholder, or a group of shareholders, may initiate a legal action to seek indemnification from the directors of a corporation in the corporation’s interest if it fails to bring such legal action itself. If so, any damages awarded by the court are paid to the corporation and legal fees relating to such action may be borne by the relevant shareholder or the group of shareholders.

The enforceability of any judgment in France will depend on the particular facts of the case as well as the laws and treaties in effect at the time. The United States and France do not currently have a treaty providing for recognition and enforcement of judgments (other than arbitration awards) in civil and commercial matters.

Raising additional capital may restrict our operations or require us to relinquish rights to our product candidates.

Until such time, if ever, as we can generate substantial revenue from the sale of our product candidates, we expect to finance our cash needs through a combination of equity offerings, debt financing, collaborations, strategic alliances and licensing arrangements. Debt financing and preferred equity financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends. If we raise additional funds through collaborations, strategic alliances or marketing, distribution or licensing arrangements with third parties, we may be required to relinquish valuable rights to our research programs or product candidates or grant licenses on terms that may not be favorable to us. If we are unable to raise additional funds through equity or debt financings or other arrangements with third parties when needed, we may be required to delay, limit, reduce or

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terminate our drug development or future commercialization efforts or grant rights to third parties to develop and market product candidates that we would otherwise prefer to develop and market ourselves.

We have broad discretion in the use of the net proceeds from this offering and may not use them effectively.

Our management will have broad discretion in the application of the net proceeds that we receive from this offering. We currently intend to use the net proceeds from this offering, together with our existing cash and cash equivalents, primarily for activities associated with the BLA, potential approval and launch of Viaskin Peanut, as well as to advance the development of our product candidates using our proprietary technology platform, Viaskin, and for working capital and other general corporate purposes. Because of the number and variability of factors that will determine our use of the net proceeds from this offering, their ultimate use may vary substantially from their currently intended use. As a result, we may spend or invest these proceeds in a way with which our shareholders disagree. The failure by our management to apply these funds effectively could harm our business and financial condition. Pending their use, we may invest the net proceeds from this offering in accordance with our investment policy in a manner that may not produce income or that may lose value. These investments may not yield a favorable return to our investors.

The ADSs offered hereby will be sold at other than fixed prices, and investors who buy ADSs at different times will likely pay different prices.

Because the sales of ADSs offered hereby will be made at other than fixed prices from time to time, the prices at which we sell these ADSs will vary and these variations may be significant. Investors who participate in this offering at different times will likely pay different prices. We will have discretion, subject to investor demand, to vary the timing, prices, and numbers of ADSs sold, and there is no minimum or maximum sale price. Investors may experience a decline in the value of their investment as a result of sales made at prices lower than the prices they paid.

The actual number of ADSs we will issue under the Sales Agreement at any one time or in total is uncertain.

We have not committed to sell, and Citizens has not committed to purchase or place as agent, any specific number of ADSs under the Sales Agreement. The number of ADSs that are sold in this offering will be determined by us during the pendency of the Sales Agreement based on, among other things, market conditions and the market price of our ADSs and ordinary shares. Accordingly, it is not possible to predict the number of ADSs that will ultimately be issued under the Sales Agreement, if any ADSs are issued thereunder.

Purchasers of ADSs will not directly hold our ordinary shares.

A holder of ADSs will not be treated as one of our shareholders and will not have direct shareholder rights. French law governs our shareholder rights. The depositary will be the holder of the ordinary shares underlying ADSs held by purchasers of ADSs. Purchasers of ADSs will have ADS holder rights. The deposit agreement among us, the depositary and purchasers of ADSs, as an ADS holder, and all other persons directly and indirectly holding ADSs, sets out ADS holder rights, as well as the rights and obligations of the depositary.

The right as a holder of ADSs to participate in any future preferential subscription rights or to elect to receive dividends in shares may be limited, which may cause dilution to the holdings of purchasers of ADSs in the offering.

According to French law, if we issue additional securities for cash, current shareholders will have preferential subscription rights for these securities on a pro rata basis unless they waive those rights at an extraordinary meeting of our shareholders (by a two-thirds majority vote) or individually by each shareholder. However, our ADS holders in the United States will not be entitled to exercise or sell such rights unless we register the rights and the securities to which the rights relate under the Securities Act or an exemption from the

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registration requirements is available. In addition, the deposit agreement provides that the depositary will not make rights available to purchasers of ADSs in the offering unless the distribution to ADS holders of both the rights and any related securities are either registered under the Securities Act or exempted from registration under the Securities Act. Further, if we offer holders of our ordinary shares the option to receive dividends in either cash or shares, under the deposit agreement the depositary may require satisfactory assurances from us that extending the offer to holders of ADSs does not require registration of any securities under the Securities Act before making the option available to holders of ADSs. We are under no obligation to file a registration statement with respect to any such rights or securities or to endeavor to cause such a registration statement to be declared effective. Moreover, we may not be able to establish an exemption from registration under the Securities Act. Accordingly, ADS holders may be unable to participate in our rights offerings or to elect to receive dividends in shares and may experience dilution in their holdings. In addition, if the depositary is unable to sell rights that are not exercised or not distributed or if the sale is not lawful or reasonably practicable, it will allow the rights to lapse, in which case you will receive no value for these rights.

U.S. holders of ADSs may suffer adverse tax consequences if we are characterized as a passive foreign investment company.

Under the U.S. Internal Revenue Code of 1986, as amended, or Code, we will be a passive foreign investment company, or PFIC, for any taxable year in which, after the application of certain “look-through” rules with respect to subsidiaries, either (i) 75% or more of our gross income consists of “passive income,” or (ii) 50% or more of the average quarterly value of our assets, including cash, consists of assets that produce, or are held for the production of, “passive income.” Passive income generally includes interest, dividends, rents, certain non-active royalties and capital gains. Whether we will be a PFIC in any year depends on the composition of our income and assets, and the relative fair market value of our assets from time to time, which we expect may vary substantially over time. Based on the composition of our gross income and gross assets, we believe that we were not a PFIC during the taxable year ended December 31, 2025. Because we may hold a substantial amount of cash and cash equivalents, and because the calculation of the value of our assets may be based in part on the value of our ADSs or ordinary shares, which may fluctuate considerably, we may be a PFIC in the current taxable year or future taxable years. Even if we determine that we are not a PFIC for a taxable year, there can be no assurance that the IRS will agree with our conclusion or would not successfully challenge our position. Our status as a PFIC is a fact-intensive determination made on an annual basis applying principles and methodologies that are unclear in some respects and subject to varying interpretations.

If you are a U.S. holder (as defined below under “Certain Tax Considerations—Material U.S. Federal Income Tax Consequences”) during the taxable year when we are considered a PFIC, then you may be subject to adverse tax consequences, particularly if a mark-to-market election or a qualified electing fund, or QEF, election has not been made with respect to your ADSs. A U.S. holder may incur significant additional U.S. federal income taxes on income resulting from certain distributions on, or any gain from the disposition of, such ADSs, as such income generally would be allocated over the U.S. holder’s holding period for its ADSs. The amount allocated to the current taxable year (i.e., the year in which the distribution occurs or the gain is recognized) and any year prior to the first taxable year in which we are a PFIC would be subject to tax as ordinary income earned in the current year, and all other amounts would be subject to tax at the highest rates of U.S. federal income taxation in effect for such years, with an interest charge then imposed on the resulting taxes in respect of such income. In addition, U.S. holders that own an interest in a PFIC are required to comply with certain reporting requirements.

A U.S. holder may in certain circumstances mitigate the adverse tax consequences of the PFIC rules by filing an election to treat the PFIC as a QEF, or, if shares of the PFIC are “marketable stock” for purposes of the PFIC rules, by making a mark-to-market election with respect to the shares of the PFIC. For any taxable year in which we are a PFIC, we will determine whether we will provide to U.S. holders the information required to make a QEF election, but there is no assurance that such information will be provided U.S. holders are strongly urged to consult with, and rely solely upon, their personal tax advisors regarding the implications of the tax provisions applicable to U.S. persons who own, directly or indirectly, interests in a foreign corporation that is or may become a PFIC. See “Taxation—Certain Material U.S. Federal Income Tax Considerations.”

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The biotechnology industry has been included in the list of critical technologies subject to foreign investment control procedure in France, which may limit the ability of certain non-French investors to participate in this or any other offering of our securities.

Under Articles L.151-3 et seq. and Articles R.151-1 et seq. of the French Financial and Monetary Code (Code monétaire et financier), the completion of any investment (i) by (a) an individual of foreign nationality, (b) any individual of French nationality not domiciled in France within the meaning of Article 4B of the French General Tax Code (Code Général des Impôts), (c) any entity governed by foreign law, and (d) any entity governed by French law controlled by one or more of the individuals or entities referred to in (a) to (c), (ii) which would result in (a) the acquisition of control—within the meaning of Article L. 233-3 of the French Commercial Code (Code de Commerce)—of a French company, (b) the acquisition of all or part of an activity of a French company, or (c) for individuals who are not nationals of a Member State of the European Union or of a State party to the agreement on the European Economic Area that has entered into an administrative assistance agreement with France and/or are not domiciled in one of these States, or for legal entities of which at least one of the members of the control chain is not governed by the law of one of these States or is not a national and/or is not domiciled there, to cross the threshold of 25% of the voting rights of a French company, or (d) for individuals who are not nationals of a Member State of the European Union or of a State party to the agreement on the European Economic Area that has entered into an administrative assistance agreement with France and/or are not domiciled in one of these States, or for legal entities of which at least one of the members of the control chain is not governed by the law of one of these States or is not a national and/or is not domiciled there, to cross the threshold of 10% of the voting rights of a French company whose shares are admitted to trading on a regulated market and (iii) whose activities concern, even occasionally, the research and development of so-called critical technologies, such as biotechnologies, and considered essential to the protection of public health, is subject to prior authorization by the French Minister of the Economy (Ministre de l’Économie).

The crossing of the threshold of 10% of the voting rights of French companies whose shares are admitted to trading on a regulated market is subject to a fast-track review procedure (filing of a simplified form, delay for the Minister to respond limited to 10 business days, transaction deemed authorized in the absence of a response at the end of the delay).

If an investment in the Company requiring the prior authorization of the Minister of the Economy is made without such authorization having been granted, the Minister of the Economy may cancel the transaction and/or order (possibly under financial penalty) the investor concerned (i) to submit an application for authorization, (ii) to have the previous situation restored at its own expense or (iii) to modify the investment. In addition, the Minister may impose undertakings and conditions on the investor (including regular reporting commitments). The investor concerned could also be declared criminally liable and be sanctioned, in particular, by exclusion from any public contract or by a fine which may not exceed the highest of the following three amounts: (i) twice the amount of the investment concerned, (ii) 10% of the Company’s annual pre-tax revenues and (iii) 5 million euros (for a company) or 1 million euros (for an individual). The application of these regulations is likely to constitute a potential barrier to investments made by investors located outside the European Economic Area and could therefore limit the Company’s access to sources of financing.

If an investment in the Company requiring the prior authorization of the Minister of the Economy is made without such authorization having been granted, the Minister of the Economy may cancel the transaction or order (possibly under financial penalty) the investor concerned (i) to submit an application for authorization, (ii) to have the previous situation restored at its own expense or (iii) to modify the investment. In addition, the Minister may impose undertakings and conditions on the investor (including regular reporting commitments). The investor concerned could also be declared criminally liable and be sanctioned, in particular, by exclusion from any public contract or by a fine which may not exceed the highest of the following three amounts: (i) twice the amount of the investment concerned, (ii) 10% of the Company’s annual pre-tax revenues and (iii) 5 million euros (for a company) or 1 million euros (for an individual). The application of these regulations is likely to constitute a potential barrier to investments made by investors located outside the

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European Economic Area and could therefore limit the Company’s access to sources of financing. Our by-laws and French corporate law contain provisions that may delay or discourage a takeover attempt.

Provisions contained in our by-laws and the corporate laws of France, the country in which we are incorporated, could make it more difficult for a third-party to acquire us, even if doing so might be beneficial to our shareholders. In addition, provisions of our by-laws impose various procedural and other requirements, which could make it more difficult for shareholders to effect certain corporate actions. These provisions include the following:

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under French law, a non-French resident as well as any French entity controlled by non-French residents of France may have to file a declaration for statistical purposes with the Banque de France, within twenty (20) working days following the settlement date of certain direct foreign investments in us, including any purchase of our ADSs. In particular, such filings are required in connection with investments exceeding €15,000,000 that lead to the acquisition of at least 10% of our share capital or voting rights or cross such 10% threshold;

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under French law, certain investments in a French company relating to certain strategic industries by individuals or entities not residents in a Member State of the European Union are subject to prior authorization of the Minister of Economy;

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under French law, the owner of 90% of the share capital or voting rights of a public company listed on a regulated market in a Member State of the European Union or in a state party to the EEA Agreement, including from the main French Stock Exchange, has the right to force out minority shareholders following a tender offer made to all shareholders;

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a merger (i.e., in a French law context, a share-for-share exchange following which our company would be dissolved without being liquidated into the acquiring entity and our shareholders would become shareholders of the acquiring entity) of our company into a company incorporated in the European Union would require the approval of our board of directors as well as a two-thirds majority of the votes held by the shareholders present, represented by proxy or voting by mail at the relevant meeting (unless the merger will result in an increase of the shareholders’ commitments, in which case the approval of each shareholder is required);

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a merger of our company into a company incorporated outside of the European Union would require the unanimous approval of our shareholders;

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under French law, a cash merger is treated as a share purchase and would require the consent of each participating shareholder;

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our shareholders have granted and may grant in the future our board of directors’ broad authorizations to increase our share capital or to issue additional ordinary shares or other securities (for example, warrants) to our shareholders, the public or qualified investors, including as a possible defense following the launching of a tender offer for our shares;

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our board of directors has the right to appoint directors to fill a vacancy created by the resignation or death of a director, subject to the approval by the shareholders of such appointment at the next shareholders’ meeting, which prevents shareholders from having the sole right to fill vacancies on our board of directors;

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our board of directors can only be convened by our chairman or our managing director, if any, or, when no board meeting has been held for more than two consecutive months, by directors representing at least one-third of the total number of directors;

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our board of directors meetings can only be regularly held if at least half of the directors attend either physically or by way of videoconference or teleconference enabling the directors’ identification and ensuring their effective participation in the board’s decisions; however, this mode of participation (by way of videoconference or teleconference) does not apply to the adoption of decisions taken for the closing of the accounts for the fiscal year, including the consolidated financial statements;

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our shares are nominative or bearer, if the legislation so permits, according to the shareholder’s choice. Shares issued are registered in individual accounts opened by us or any authorized intermediary, in the name of each shareholder and kept according to the terms and conditions laid down by the legal and regulatory provisions;

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our by-laws can be changed in accordance with applicable laws;

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under French law, the crossing of certain ownership thresholds has to be disclosed and can impose certain obligations;

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transfers of shares shall comply with applicable insider trading rules and regulations and in particular with Directive 2014/57/EU of the European Parliament and of the Council on criminal sanctions for market abuse and Regulation n°596/2014 on market abuse, both dated April 16, 2014, as amended; and

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pursuant to French law, the sections of the by-laws relating to the number of directors and election and removal of a director from office may only be modified by a resolution adopted by at least a two thirds majority vote of our shareholders present, represented by a proxy or voting by mail at the meeting.

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USE OF PROCEEDS

We may issue and sell from time to time ADSs, each ADS representing five ordinary shares, having aggregate gross sales proceeds of up to $150.0 million before payment of sales agent commissions and offering expenses payable by us. Because there is no minimum offering amount required as a condition to close any transaction as a part of this offering, the actual total public offering amount, commissions and proceeds to us, if any, are not determinable at this time. There can be no assurance that we will sell any ADSs under or fully utilize the Sales Agreement as a source of financing.

We intend to use the net proceeds of any offering of securities primarily for activities associated with manufacturing expansion, our BLAs in ages 4 through 7 and 1 through 3, launch preparation of Viaskin Peanut in ages 4-7, if approved, development of our product candidates, and for working capital and other general corporate purposes. Accordingly, we will have significant discretion in the use of any net proceeds.

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DILUTION

If you invest in our ADSs in this offering, your ownership interest will be immediately diluted to the extent of the difference between the public offering price per ADS paid by purchasers in the offering and our as adjusted net tangible book value per ADS immediately after this offering.

Our net tangible book value as of June 30, 2026 was $160.4 million (or $2.71 per ADS based on the ADS ratio of each ADS representing five ordinary shares), which is equivalent to €140.5 million (or €0.47 per ordinary share), with all convenience translations presented in this section based on the noon buying rate of the Federal Reserve Bank of New York in effect as of June 30, 2026, of €1 = $1.1417. Net tangible book value per ordinary share is determined by dividing total tangible assets less total liabilities by the aggregate number of ordinary shares outstanding as of June 30, 2026.

After giving effect to the sale by us of ADSs in the aggregate amount of $150.0 million at an assumed offering price of $13.86 per ADS, the last reported sale price of our ADSs on Nasdaq on July 23, 2026, and after deducting estimated commissions and estimated offering expenses of $4.5 million payable by us, our as adjusted net tangible book value as of June 30, 2026 would have been $305.9 million (or $4.37 per ADS based on the ADS ratio of each ADS representing five ordinary shares), which is equivalent to €268.0 million (or €0.77 per ordinary share). This represents an immediate increase in net tangible book value of $1.66 per ADS to our existing holders and an immediate dilution of $9.49 per ADS issued to the new investors purchasing ADSs in this offering.

The following table illustrates such per ADS dilution. The information is illustrative only and will adjust based on the actual prices at which ADSs are sold, the actual number of ADSs sold and other terms of the offering determined at the time our ADSs are sold pursuant to this prospectus supplement.


Assumed Public Offering Price per ADS		$13.86

Net tangible book value per ADS as of June 30, 2026	$2.71
Increase in net tangible book value per ADS attributable to this offering	1.66

As adjusted net tangible book value per ADS as of June 30, 2026 after giving effect to this offering		4.37

Dilution per ADS to new investors purchasing in this offering		$9.49

To the extent that options, warrants or pre-funded warrants are exercised, new options, free shares, warrants or pre-funded warrants are issued under our existing or future equity incentive plans, or we issue additional ADSs or ordinary shares in the future, there may be further dilution to investors participating in this offering. In addition, we may choose to raise additional capital because of market conditions or strategic considerations, even if we believe that we have sufficient funds for our current or future operating plans. If we raise additional capital through the sale of additional equity, the issuance of these securities could result in further dilution.

The tables and calculations above are based on 296,061,497 ordinary shares outstanding (including treasury shares and including ordinary shares represented by ADSs) as of June 30, 2026, and excludes the following:

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142,647,271 ordinary shares issuable upon the exercise of pre-funded warrants to purchase ordinary shares, outstanding as of June 30, 2026;

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87,008 ordinary shares issuable upon the exercise of share warrants (Bons de souscription d’actions, or BSA) outstanding as of June 30, 2026;

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15,067,578 ordinary shares issuable upon the exercise of stock options outstanding as of June 30, 2026.

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Except as otherwise noted, the information in this prospectus supplement assumes no exercise of the stock options and warrants listed above and no expiry of the vesting period of the free shares listed above.

Sales of our ADSs, if any, under this prospectus supplement will be made in sales deemed to be an “at the market offering” as defined in Rule 415(a)(4) promulgated under the Securities Act from time to time and, therefore, the price of any such securities sold may vary. An increase of $1.00 per ADS in the price at which the ADSs are sold from the assumed offering price of $13.86 per ADS shown in the table above, assuming all of our ADSs in the aggregate amount of $150.0 million are sold during the term of the Sales Agreement at that price of $14.86 per ADS, would increase our as adjusted net tangible book value per ADS after the offering to $4.41 per ADS, which would represent a decrease in net tangible book value per ADS to new investors in this offering of $10.45 per ADS, after deducting commissions and estimated offering expenses of $4.5 million payable by us. A decrease of $1.00 per ADS in the price at which the ADSs are sold from the assumed offering price of $13.86 per ADS shown in the table above, assuming all of our ADSs in the aggregate amount of $150.0 million are sold during the term of the Sales Agreement at that price of $12.86 per ADS, would increase our as adjusted net tangible book value per ADS after the offering to $4.32 per ADS, which would represent a decrease in net tangible book value per ADS to new investors in this offering of $8.54 per ADS, after deducting commissions and estimated offering expenses of $4.5 million payable by us. This information is supplied for illustrative purposes only.

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PLAN OF DISTRIBUTION

We previously entered into a Sales Agreement with Citizens, acting as agent, under which we may offer and sell ADSs, each ADS representing five ordinary shares, from time to time and representing, together with all the other ordinary shares which have been admitted to trading on Euronext Paris without a French listing prospectus or an exemption document, over a rolling period of 12 months, less than 30% of the number of securities of the same class already admitted to trading on Euronext Paris. We have previously sold an aggregate of 4,790,552 ADSs for aggregate gross proceeds of approximately $64.8 million pursuant to the Sales Agreement and the Prior Registration Statement. As of the date of this prospectus supplement, we will not make any further offers or sales of our ADSs pursuant to the Prior Registration Statement, which expired on April 17, 2026. Sales of our ADSs, if any, under this prospectus supplement and the accompanying prospectus may be made in sales deemed to be an “at the market offering” as defined in Rule 415(a)(4) under the Securities Act. Pursuant to this prospectus supplement and accompanying prospectus, we may offer and sell ADS having an aggregate offering price of up to an additional $150.0 million.

Under the authority granted by our shareholders, pursuant to the 25th and 31st resolutions adopted by the 2026 Annual General Meeting, the ADSs we are offering may only be purchased by: (i) natural person(s) or legal entity(ies), including companies, trusts, investment funds or other investment vehicle(s), regardless of their form, under French or foreign law, investing on a regular basis in the pharmaceutical, biotechnological or medical technology sector, and/or (ii) French or foreign companies, institutions or entities of any form, carrying out a significant portion of their business in the pharmaceutical or chemical sector or in the field of medical devices and/or technologies or research in these areas. In order to purchase ADSs in the offering, you will be required to execute and provide an investor letter representing that you satisfy the foregoing investor criteria.

Each time we wish to issue and sell our ADSs under the Sales Agreement, we will notify Citizens of the number of ADSs to be issued, any time period over which such sales may be made, any limitation on the number of ADSs to be sold, and any limitation on the price at which such sales may be made. Once we have so instructed Citizens, unless Citizens declines to accept the terms of such notice, Citizens has agreed to use its commercially reasonable efforts, consistent with its normal trading and sales practices, to arrange on our behalf for the sale of all such ADSs requested to be sold by us on the specified terms.

The obligations of Citizens under the Sales Agreement to sell our ADSs are subject to a number of conditions that we must meet including the determination of our Chief Executive Officer or board of directors to issue the shares underlying the ADSs to be sold under the Sales Agreement.

We expect to deliver ordinary shares to Citizens for settlement on the second trading day following the date on which the sale of the ADSs was made (such settlement cycle being referred to as T+2). Under Rule 15c6-1 of the Exchange Act, trades in the secondary market generally are required to settle in one trading day, unless the parties to any such trade expressly agree otherwise. Accordingly, purchasers of the ADSs who wish to trade purchased ADSs prior to the second trading day after the date of sale hereunder should consult their own advisors. In addition, the purchaser of any ADSs in the offering may agree for settlement to occur on an alternative settlement cycle longer than T+2, as permitted under Rule 15c6-1 promulgated under the Exchange Act.

Sales of our ADSs as contemplated in this prospectus supplement will be settled through the facilities of The Depository Trust Company or by such other means as we and Citizens may agree upon. There is no arrangement for funds to be received in an escrow, trust or similar arrangement.

We will pay Citizens a commission equal to 3.0% of the aggregate gross proceeds we receive from each sale of our ADSs. Because there is no minimum offering amount required as a condition to close this offering, the actual total public offering amount, commissions and proceeds to us, if any, are not determinable at this time. In addition, we agreed to reimburse Citizens for the incurred fees and disbursements of its outside counsel, payable upon execution of the Sales Agreement, in an amount not to exceed $100,000, in addition to certain ongoing

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disbursements of its legal counsel, unless we and Citizens otherwise agree. We estimate that the total expenses for the offering, excluding any commissions or expense reimbursement payable to Citizens under the terms of the Sales Agreement, will be approximately $800,000. The remaining sale proceeds, after deducting any other transaction fees, will equal our net proceeds from the sale of such ADSs.

Citizens will provide written confirmation to us before the open of trading on the regulated market of Euronext in Paris on the day following each day in which ADSs are sold through it as sales agent under the Sales Agreement. Each confirmation will include the number of ADSs sold through it as sales agent on that day, the price of the ADSs sold, the gross proceeds to us and copies of such documents as required by French law and the limits and other conditions set forth in our corporate authorizations.

We will report at least quarterly the number of ADSs sold through Citizens under the Sales Agreement, the net proceeds to us and the compensation paid by us to Citizens in connection with the sales of ADSs.

In connection with the sale of our ADSs on our behalf, Citizens will be deemed to be an “underwriter” within the meaning of the Securities Act, and the compensation of Citizens will be deemed to be underwriting commissions. We have agreed to indemnify Citizens against certain civil liabilities, including liabilities under the Securities Act. We have also agreed to contribute to payments Citizens may be required to make in respect of such liabilities.

The offering of our ADSs pursuant to the Sales Agreement will terminate upon the earlier of (i) the sale of all ADSs subject to the Sales Agreement and (ii) the termination of the Sales Agreement as permitted therein.

This summary of the material provisions of the Sales Agreement does not purport to be a complete statement of its terms and conditions. A copy of the Sales Agreement will be filed as an exhibit to a Current Report on Form 8-K filed under the Exchange Act, and incorporated by reference in this prospectus supplement.

Citizens and its affiliates have provided and may in the future provide various investment banking, commercial banking, financial advisory and other financial services for us and our affiliates, for which services they have received, and may in the future receive, customary fees. In the course of its business, Citizens may actively trade our securities for its own account or for the accounts of customers, and, accordingly, Citizens may at any time hold long or short positions in such securities.

This prospectus supplement and the accompanying prospectus in electronic format may be made available on a website maintained by Citizens, and Citizens may distribute this prospectus supplement and the accompanying prospectus electronically.

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TAXATION

Certain Material U.S. Federal Income Tax Considerations

The following discussion describes certain material U.S. federal income tax considerations relating to the ownership and disposition of ordinary shares or ADSs by U.S. holders (as defined below). This summary applies to U.S. holders that hold our ordinary shares or ADSs as capital assets. This summary is based on the Code, U.S. Treasury regulations promulgated thereunder and administrative and judicial interpretations thereof, all as in effect on the date hereof and all of which are subject to change, possibly with retroactive effect. This discussion does not address all of the U.S. federal income tax considerations that may be relevant to specific U.S. holders in light of their particular circumstances, or to U.S. holders subject to special treatment under U.S. federal income tax laws (such as certain financial institutions, insurance companies, broker-dealers and traders in securities or other persons that generally mark their securities to market for U.S. federal income tax purposes, tax-exempt entities, retirement plans, regulated investment companies, real estate investment trusts, certain former citizens, expatriates or long-term residents of the United States, persons that hold ordinary shares or ADSs as part of a “straddle,” “hedge,” “conversion transaction,” “synthetic security” or integrated investment, persons deemed to sell our ordinary shares or ADSs under the constructive sale provisions of the Code, persons who hold or receive our ordinary shares or ADSs pursuant to the exercise of any employee stock option or otherwise as compensation, persons that have a “functional currency” other than the U.S. dollar, persons that own directly, indirectly or through attribution 10% or more of the voting power or value of our ordinary shares or ADSs, corporations that accumulate earnings to avoid U.S. federal income tax, partnerships and other pass-through entities (or arrangements treated as a partnership for U.S. federal income tax purposes), and investors in such pass-through entities). This summary does not address any U.S. state or local tax consequences, non-U.S. tax consequences or any U.S. federal estate, gift or alternative minimum tax consequences, the application of special tax accounting rules under Section 451(b) of the Code or the Medicare contribution tax on net investment income.

As used in this discussion, the term “U.S. holder” means a beneficial owner of ordinary shares or ADSs that is, for U.S. federal income tax purposes, or is treated as: (1) an individual who is a citizen or resident of the United States, (2) a corporation (or entity treated as a corporation for U.S. federal income tax purposes) created or organized in or under the laws of the United States, any state thereof, or the District of Columbia, (3) an estate the income of which is subject to U.S. federal income tax regardless of its source or (4) a trust (x) with respect to which a court within the United States is able to exercise primary supervision over its administration and one or more United States persons have the authority to control all of its substantial decisions or (y) that has elected under applicable U.S. Treasury regulations to be treated as a domestic trust for U.S. federal income tax purposes.

If an entity or arrangement treated as a partnership for U.S. federal income tax purposes holds ordinary shares or ADSs, the U.S. federal income tax consequences relating to an investment in ordinary shares or ADSs will depend in part upon the status and activities of such entity or arrangement and the particular partner. Any such entity or arrangement and a partner of any such entity should consult its tax advisor regarding the U.S. federal income tax consequences applicable to it (and, as applicable, its partners) of the purchase, ownership and disposition of ordinary shares or ADSs.

Persons considering an investment in ordinary shares or ADSs should consult their tax advisors as to the particular tax consequences applicable to them relating to the purchase, ownership and disposition of ordinary shares or ADSs, including the applicability of U.S. federal, state and local tax laws and non-U.S. tax laws.

The discussion below assumes that the representations contained in the deposit agreement are true and that the obligations in the deposit agreement and any related agreement will be complied with in accordance with their terms. Generally, a holder of an ADS should be treated for U.S. federal income tax purposes as the beneficial owner of the ordinary shares represented by the ADS. Accordingly, no gain or loss will be recognized upon an exchange of ADSs for ordinary shares. The U.S. Treasury has expressed concerns that intermediaries in

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the chain of ownership between the holder of an ADS and the issuer of the security underlying the ADS may be taking actions that are inconsistent with the beneficial ownership by the holder of the underlying security. Accordingly, the creditability of foreign taxes, if any, as described below, could be affected by actions taken by intermediaries in the chain of ownership between the holders of ADSs and our company if as a result of such actions the holders of ADSs are not properly treated as beneficial owners of the underlying ordinary shares.

Passive foreign investment company consequences

In general, a corporation organized outside the United States will be treated as a passive foreign investment company, or PFIC, for any taxable year in which, after applying certain look-through rules, either (1) at least 75% of its gross income is “passive income”, or (2) at least 50% of the value of its assets, determined on the basis of a quarterly average, are assets that produce passive income or are held for the production of passive income. Passive income for this purpose generally includes, among other things, dividends, interest, certain royalties, rents, and gains from the sale or exchange of property that gives rise to passive income. Assets that produce or are held for the production of passive income generally include cash, even if held as working capital or raised in a public offering, marketable securities, and other assets that may produce passive income. Generally, in determining whether a non-U.S. corporation is a PFIC, a proportionate share of the income and assets of each corporation in which it owns, directly or indirectly, at least a 25% interest (by value) is taken into account.

Our status as a PFIC will depend on the nature and composition of our gross income, and the nature, composition and value of our gross assets from time to time. We have not yet determined whether we expect to be a PFIC for the current taxable year. Based on the nature of our gross income and the estimated value and composition of our gross assets, we believe that we were not a PFIC during the taxable year ended December 31, 2025. Because we may hold a substantial amount of cash and cash equivalents, and because the calculation of the value of our assets may be based in part on the value of our ADSs or ordinary shares, which may fluctuate considerably, we may be a PFIC in the current taxable year or future taxable years. Even if we determine that we are not a PFIC for a taxable year, there can be no assurance that the IRS will agree with our conclusion or would not successfully challenge our position. Our status as a PFIC is a fact-intensive determination made on an annual basis applying principles and methodologies that are unclear in some respects and subject to varying interpretations. In particular, the characterization of our assets as active or passive may depend in part on our current and intended future business plans, which are subject to change. Accordingly, we cannot provide any assurance, and our U.S. counsel expresses no opinion with respect to our PFIC status for any prior, current or future taxable year.

If we are a PFIC in any taxable year during which a U.S. holder owns ordinary shares or ADSs, the U.S. holder could be liable for additional taxes and interest charges under the “PFIC excess distribution regime” upon (1) a distribution paid during a taxable year that is greater than 125% of the average annual distributions paid in the three preceding taxable years, or, if shorter, the U.S. holder’s holding period for the ordinary shares or ADSs, and (2) any gain recognized on a sale, exchange or other disposition, including a pledge, of the ordinary shares or ADSs, whether or not we continue to be a PFIC. Under the PFIC excess distribution regime, the tax on such distribution or gain would be determined by allocating the distribution or gain ratably over the U.S. holder’s holding period for the ordinary shares or ADSs. The amount allocated to the current taxable year (i.e., the year in which the distribution occurs or the gain is recognized) and any year prior to the first taxable year in which we are a PFIC will be taxed as ordinary income earned in the current taxable year. The amount allocated to other taxable years will be taxed at the highest marginal rates in effect for individuals or corporations, as applicable, to ordinary income for each such taxable year, and an interest charge, generally applicable to underpayments of tax, will be added to the tax.

If we are a PFIC for any year during which a U.S. holder holds ordinary shares or ADSs, we generally must continue to be treated as a PFIC by that holder for all succeeding years during which the U.S. holder holds the ordinary shares or ADSs, unless we cease to meet the requirements for PFIC status and the U.S. holder makes a “deemed sale” election with respect to the ordinary shares or ADSs. If the election is made, the U.S. holder will

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be deemed to sell the ordinary shares or ADSs it holds at their fair market value on the last day of the last taxable year in which we qualified as a PFIC, which may result in recognition of gain (but not loss) taxable under the PFIC excess distribution regime without the receipt of any corresponding cash. After the deemed sale election, the U.S. holder’s ordinary shares or ADSs would not be treated as shares of a PFIC unless we subsequently again become a PFIC.

If we are a PFIC for any taxable year during which a U.S. holder holds ordinary shares or ADSs and one of our subsidiaries or other entity in which we held a direct or indirect equity interest is also a PFIC (i.e., a lower-tier PFIC), such U.S. holder would be treated as owning a proportionate amount (by value) of the shares of the lower-tier PFIC and would be subject to U.S. federal income tax under the PFIC excess distribution regime on certain distributions by the lower-tier PFIC and on gain from the disposition of shares of the lower-tier PFIC even though such U.S. holder would not receive the proceeds of those distributions or dispositions. Each U.S. holder is advised to consult its tax advisors regarding the application of the PFIC rules to our non-U.S. subsidiaries.

If we are a PFIC, a U.S. holder will not be subject to tax under the PFIC excess distribution regime on distributions or gain recognized on ordinary shares or ADSs if such U.S. holder makes a valid “mark-to-market” election for our ordinary shares or ADSs. A mark-to-market election is available to a U.S. holder only for “marketable stock.” Our ordinary shares or ADSs will be marketable stock as long as they remain listed on the Nasdaq Capital Market or other “qualified exchange” and are regularly traded, other than in de minimis quantities, on at least 15 days during each calendar quarter. If a mark-to-market election is in effect, a U.S. holder generally would take into account, as ordinary income each year, the excess of the fair market value of the ordinary shares or ADSs held at the end of such taxable year over the adjusted tax basis of such ordinary shares or ADSs. The U.S. holder also would take into account, as an ordinary loss each year, the excess of the adjusted tax basis of such ordinary shares or ADSs over their fair market value at the end of the taxable year, but only to the extent of the excess of amounts previously included in income over ordinary losses deducted as a result of the mark-to-market election. The U.S. holder’s tax basis in ordinary shares or ADSs would be adjusted to reflect any income or loss recognized as a result of the mark-to-market election. Any gain from a sale, exchange or other disposition of ordinary shares or ADSs in any taxable year in which we are a PFIC would be treated as ordinary income and any loss from such sale, exchange or other disposition would be treated first as ordinary loss (to the extent of any net mark-to-market gains previously included in income) and thereafter as capital loss. If, after having been a PFIC for one or more taxable years, we cease to be classified as a PFIC for the remainder of a U.S. holder’s holding period in ordinary shares or ADSs, the U.S. holder would not be required to take into account any unrecognized gain or loss in the manner described above and any subsequently recognized gain or loss would be subject to tax as described below “—Sale or Other Taxable Disposition of Ordinary Shares or ADSs.”

A mark-to-market election will not apply to ordinary shares or ADSs for any taxable year during which we are not a PFIC, but will remain in effect with respect to any subsequent taxable year in which we become a PFIC. Such election will not apply to our subsidiaries. Accordingly, a U.S. holder may continue to be subject to tax under the PFIC excess distribution regime with respect to any lower-tier PFICs notwithstanding the U.S. holder’s mark-to-market election for the ordinary shares or ADSs.

The tax consequences that would apply if we are a PFIC also would be different from those described above if a U.S. holder were able to make a valid qualified electing fund, or QEF, election, which would require us to make available certain information to the U.S. holder. If a U.S. holder makes a QEF election with respect to a ordinary shares or ADSs, the U.S. Holder will be currently taxable on its pro rata share of our ordinary earnings and net capital gain (whether or not distributed, at ordinary income and capital gain rates, respectively) for each taxable year that we are classified as a PFIC and will not be required to include such amounts in income when actually distributed by us. For any taxable year in which we are a PFIC, we will determine whether we will provide to U.S. holders the information required to make a QEF election.

Each U.S. person that is a shareholder of a PFIC is generally required to file an annual information return on IRS Form 8621 containing such information as the U.S. Treasury Department may require. The failure to file IRS

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Form 8621 could result in the imposition of penalties and the extension of the statute of limitations with respect to U.S. federal income tax.

The U.S. federal income tax rules relating to PFICs are very complex. Prospective U.S. holders are strongly urged to consult their tax advisors with respect to the impact of PFIC status on the purchase, ownership and disposition of ordinary shares or ADSs, the consequences to them of an investment in a PFIC, any elections available with respect to the ordinary shares or ADSs and the IRS information reporting obligations with respect to the purchase, ownership and disposition of ADSs.

Distributions

We currently do not expect to make distributions on our ordinary shares or ADSs. Subject to the discussion above under “—Passive Foreign Investment Company Consequences,” a U.S. holder that receives a distribution with respect to ordinary shares or ADSs generally will be required to include the gross amount of such distribution in gross income as a dividend when actually or constructively received to the extent of the U.S. holder’s pro rata share of our current and/or accumulated earnings and profits (as determined under U.S. federal income tax principles). To the extent a distribution received by a U.S. holder is not a dividend because it exceeds the U.S. holder’s pro rata share of our current and accumulated earnings and profits, it will be treated first as a tax-free return of capital and reduce (but not below zero) the adjusted tax basis of the U.S. holder’s ordinary shares or ADSs. To the extent the distribution exceeds the adjusted tax basis of the U.S. holder’s ordinary shares or ADSs, the remainder will be taxed as capital gain. Because we do not expect to account for our earnings and profits in accordance with U.S. federal income tax principles, U.S. holders should expect all distributions to be reported to them as dividends. Distributions on ordinary shares or ADSs that are treated as dividends generally will constitute income from sources outside the United States for foreign tax credit purposes and generally will constitute passive category income. If any foreign withholding tax is imposed on dividends paid on ordinary shares or ADSs, U.S. holders may be eligible for a foreign tax credit against such U.S. holder’s federal income tax liability, or an itemized deduction in lieu of a foreign tax credit. Such dividends will not be eligible for the “dividends received” deduction generally allowed to corporate shareholders with respect to dividends received from U.S. corporations.

Dividends paid by a “qualified foreign corporation” are eligible under current law for taxation at a reduced capital gains rate rather than the marginal tax rates generally applicable to ordinary income provided that certain requirements are met. A non-U.S. corporation (other than a corporation that is classified as a PFIC for the taxable year in which the dividend is paid or the preceding taxable year) generally will be considered to be a qualified foreign corporation (a) if it is eligible for the benefits of a comprehensive tax treaty with the United States that the Secretary of Treasury of the United States determines is satisfactory for this purpose and that includes an exchange of information provision, or (b) with respect to any dividend it pays on shares that are readily tradable on an established securities market in the United States. We believe that we qualify as a resident of France for purposes of, and are eligible for the benefits of, the Convention between the Government of the United States of America and the Government of the French Republic for the Avoidance of Double and the Prevention of Fiscal Evasion with respect to Taxes on Income and Capital, signed January 1, 1996, as amended and currently in force, or the Treaty. We also believe that the Treaty should be treated as satisfying conditions described in clause (a) above, although there can be no assurance in this regard. Further, our ADSs will be listed on the Nasdaq Capital Market, which is an established securities market in the United States, and we expect the ADSs to be readily tradable on the Nasdaq Capital Market, although there can be no assurance in this regard. Subject to the discussion above under “—Passive Foreign Investment Company Consequences,” if the Treaty is applicable, or if the ADSs are readily tradable on an established securities market in the United States, dividends paid on ADSs generally will be “qualified dividend income” in the hands of individual U.S. holders, provided that certain conditions are met, including certain holding period requirements and the absence of certain risk reduction transactions. Each U.S. holder is urged to consult its tax advisors regarding the availability of the reduced tax rate on dividends with regard to its particular circumstances.

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Sale or other taxable disposition of Ordinary Shares or ADSs

Subject to the discussion above under “—Passive Foreign Investment Company Consequences,” a U.S. holder generally will recognize capital gain or loss for U.S. federal income tax purposes upon the sale or other taxable disposition of ordinary shares or ADSs in an amount equal to the difference, if any, between the amount realized (i.e., the amount of cash plus the fair market value of any property received) on the sale, exchange or other disposition and such U.S. holder’s adjusted tax basis in the ordinary shares or ADSs. Such capital gain or loss generally will be long-term capital gain taxable at a reduced rate for non-corporate U.S. holders, or long-term capital loss if, on the date of sale or other taxable disposition, the ordinary shares or ADSs were held by the U.S. holder for more than one year. Any capital gain of a non-corporate U.S. holder that is not long-term capital gain is taxed at ordinary income rates. The deductibility of capital losses is subject to limitations. Any gain or loss recognized from the sale or other disposition of ordinary shares or ADSs will generally be gain or loss from sources within the United States for U.S. foreign tax credit purposes.

Information reporting and backup withholding

U.S. holders may be required to file certain U.S. information reporting returns with the IRS with respect to an investment in ordinary shares or ADSs, including, among others, IRS Form 8938 (Statement of Specified Foreign Financial Assets). As described above under “—Passive Foreign Investment Company Consequences”, each U.S. holder who is a shareholder of a PFIC must file an annual report containing certain information.

Dividends on and proceeds from the sale or other disposition of ordinary shares or ADSs may be reported to the IRS unless the U.S. holder establishes a basis for exemption. Backup withholding may apply to amounts subject to reporting if the U.S. holder fails to provide an accurate U.S. taxpayer identification number or otherwise establish a basis for exemption, or is described in certain other categories of persons. However, U.S. holders that are corporations generally are excluded from these information reporting and backup withholding tax rules. Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules generally will be allowed as a refund or a credit against a U.S. holder’s U.S. federal income tax liability if the required information is furnished by the U.S. holder on a timely basis to the IRS.

U.S. holders should consult their tax advisors regarding the backup withholding tax and information reporting rules.

THIS SUMMARY OF CERTAIN U.S. FEDERAL INCOME TAX CONSIDERATIONS IS FOR GENERAL INFORMATION ONLY AND IS NOT TAX ADVICE. YOU SHOULD CONSULT YOUR TAX ADVISOR WITH RESPECT TO THE APPLICATION OF U.S. FEDERAL INCOME TAX LAWS TO YOUR PARTICULAR SITUATION AS WELL AS ANY TAX CONSEQUENCES OF THE PURCHASE, OWNERSHIP, AND DISPOSITION OF ORDINARY SHARES OR ADSs ARISING UNDER U.S. FEDERAL ESTATE OR GIFT TAX RULES OR UNDER THE LAWS OF ANY STATE, LOCAL, NON-U.S. OR ANY OTHER TAXING JURISDICTION.

THE DISCUSSION ABOVE IS A GENERAL SUMMARY. IT DOES NOT COVER ALL TAX MATTERS THAT MAY BE OF IMPORTANCE TO A PROSPECTIVE INVESTOR. EACH PROSPECTIVE INVESTOR IS URGED TO CONSULT ITS OWN TAX ADVISOR ABOUT THE TAX CONSEQUENCES TO IT OF AN INVESTMENT IN ORDINARY SHARES OR ADSS IN LIGHT OF THE INVESTOR’S OWN CIRCUMSTANCES.

Material French Income Tax Considerations

The following describes the material French income tax consequences to U.S. holders of purchasing, owning and disposing of our ordinary shares or ADSs and, unless otherwise noted, this discussion is the opinion of Gide Loyrette Nouel A.A.R.P.I, our French tax counsel, insofar as it relates to matters of French tax law and legal conclusions with respect to those matters.

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This discussion does not purport to be a complete analysis or listing of all potential tax effects of the acquisition, ownership or disposition of our ordinary shares or ADSs to any particular investor, and does not discuss tax considerations that arise from rules of general application or that are generally assumed to be known by investors. All of the following is subject to change. Such changes could apply retroactively and could affect the consequences described below.

The description of the French income tax and real estate wealth tax consequences set forth below is based on the Convention between the Government of the United States of America and the Government of the French Republic for the Avoidance of Double Taxation and the Prevention of Fiscal Evasion with Respect to Taxes on Income and Capital of August 31, 1994, or the Treaty, which came into force on December 30, 1995 (as amended by any subsequent protocols, including the protocol of January 13, 2009), and the tax guidelines issued by the French tax authorities in force as of the date of this prospectus supplement, or the Treaty.

If a partnership (or any other entity treated as a partnership for U.S. federal income tax purposes) holds ordinary shares or ADSs, the tax treatment of the partnership and a partner in such partnership generally will depend upon the status of the partner and the activities of the partnership. Such partner or partnership is urged to consult its own tax advisor regarding the specific tax consequences of acquiring, owning and disposing of ordinary shares or ADSs.

French tax rules applicable to French assets that are held by or in foreign trusts provide inter alia for the inclusion of trust assets in the settlor’s net assets for the purpose of applying the French real estate wealth tax, for the application of French gift and death duties to French assets held in trust, for a specific tax on capital on the French assets of foreign trusts not already subject to the French real estate wealth tax and for a number of French tax reporting and disclosure obligations. The following discussion does not address the French tax consequences applicable to securities (including ordinary shares or ADSs) held in trusts. If ordinary shares or ADSs are held in trust, the grantor, trustee and beneficiary are urged to consult their own tax advisor regarding the specific tax consequences of acquiring, owning and disposing of securities (including ordinary shares or ADSs).

This discussion applies only to investors that hold ordinary shares or ADSs as capital assets, that have the U.S. dollar as their functional currency, that are entitled to Treaty benefits under the “Limitation on Benefits” provision contained in the Treaty, and whose ownership of the ordinary shares or ADSs is not effectively connected to a permanent establishment or a fixed base in France. Certain U.S. holders (including, but not limited to, U.S. expatriates, partnerships or other entities classified as partnerships for U.S. federal income tax purposes, banks, insurance companies, regulated investment companies, tax-exempt organizations, financial institutions, persons subject to the alternative minimum tax, persons who acquired the securities pursuant to the exercise of employee share options or otherwise as compensation, persons that own (directly, indirectly or by attribution) 5% or more of our voting stock or 5% or more of our outstanding share capital, dealers in securities or currencies, persons that elect to mark their securities to market for U.S. federal income tax purposes and persons holding securities as a position in a synthetic security, straddle or conversion transaction) may be subject to special rules not discussed below.

U.S. holders are urged to consult their own tax advisors regarding the tax consequences of the purchase, ownership and disposition of securities in light of their particular circumstances, especially with regard to the “Limitations on Benefits” provision.

Estate and Gift Taxes

In general, a transfer of securities by gift or by reason of death of a U.S. holder that would otherwise be subject to French gift or inheritance tax, respectively, will not be subject to such French tax by reason of the Convention between the Government of the United States of America and the Government of the French Republic for the Avoidance of Double Taxation and the Prevention of Fiscal Evasion with Respect to Taxes on Estates, Inheritances and Gifts, dated November 24, 1978 (as amended by the protocol of December 8, 2004),

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unless (i) the donor or the transferor is domiciled in France at the time of making the gift or at the time of his or her death, or (ii) the securities were used in, or held for use in, the conduct of a business through a permanent establishment or a fixed base in France.

Tax on Financial Transactions

Pursuant to Article 235 ter ZD of the Code général des impôts (the French Tax Code or the FTC), purchases of certain securities, including ordinary shares or ADSs, issued by a French company listed on a regulated market of the European Union or on a foreign regulated market formally acknowledged by the French Minister of Economy, after consultation opinion from the French Financial Markets Authority (AMF) are subject to a 0.4% French tax on financial transactions provided that the issuer’s market capitalization exceeds 1 billion euros as of December 1 of the year preceding the taxation year (the rate of the French tax on financial transactions was raised from 0.3% to 0.4% for the acquisitions made as from April 1 2025). A list of French relevant companies whose market capitalization exceeds 1 billion euros as of December 1 of the year preceding the taxation year is published annually and at least once a year, by the French State. Pursuant to Regulations BOI-ANNX-000467-17/12/2025 issued on December 17, 2025, as at December 1, 2025, our market capitalization did not exceed 1 billion euros and are therefore not included in such list..

As a consequence, neither the ADSs nor the ordinary shares are currently within the scope of the French tax on financial transactions.

Following this offering, purchases of our securities may be subject to such tax in the future provided that our market capitalization exceeds 1 billion euros in the year preceding the taxation year.

Registration Duties

In the case where the French tax on financial transactions provided for under Article 235 ter ZD of the FTC is not applicable, transfers of shares issued by a French company, which is listed on a regulated or organized market within the meaning of the French Monetary and Financial Code (Code monétaire et financier), are subject to uncapped registration duties at the rate of 0.1% if the transfer is evidenced by a written statement (acte) executed either in France or outside France. Although there is no case law or official guidelines published by the French tax authorities on this point, transfers of ADSs should remain outside of the scope of the aforementioned 0.1% registration duties.

Tax on Sale or Other Disposition

As a matter of principle, under French tax law, a U.S. holder should not be subject to any French tax on any capital gain from the sale, exchange, repurchase or redemption by us of ordinary shares or ADSs (it being however specified as regards redemption that redemption proceeds may under certain circumstances be partially or fully qualified as dividends for French domestic tax law and, as a result, be subject to French dividend withholding tax), provided such U.S. holder is not a French tax resident for French tax purposes, and has not held more than 25% of our dividend rights, known as “droits aux bénéfices sociaux” at any time during the preceding five years, either directly or indirectly.

As an exception, a U.S holder resident, established or incorporated in a non-cooperative State or territory as defined in Article 238-0 A of the FTC other than those States or territories mentioned in 2° of 2 bis of the same Article 238-0 A should be subject to a 75% withholding tax in France on any such capital gain, regardless of the fraction of the dividend rights it holds, unless the U.S. holder provides evidence that the main purpose and effect of the holding of these ordinary shares or ADSs is not to allow the location of profits in a non-cooperative State or territory. The list of non-cooperative State or territories is published by decree and is in principal updated annually. This list was last updated on April 15, 2026, and currently includes Anguilla, Antigua and Barbuda, Guam, US Virgin Islands, Palau, Panama, Russia, American Samoa, Turks and Caicos Islands, Vanuatu and Vietnam. States referred to in Article 238-0 A 2 bis 2° of the FTC, and thus outside of the scope of Article 244 bis B of the FTC, are currently Guam, US Virgin Islands, Palau, Panama, Russia, American Samoa and Vietnam.

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In general, under application of the Treaty, a U.S. holder who is a U.S. resident for purposes of the Treaty and entitled to Treaty benefit will not be subject to French tax on any such capital gain (other than redemption proceeds characterized as dividends under French domestic tax law or administrative guidelines) unless the ordinary shares or the ADSs form part of the business property of a permanent establishment or fixed base that the U.S. holder has in France. U.S. holders who own ordinary shares or ADSs through U.S. partnerships that are not resident for Treaty purposes are advised to consult their own tax advisors regarding their French tax treatment and their eligibility for Treaty benefits in light of their own particular circumstances.

A U.S. holder that is not a U.S. resident for Treaty purposes or is not entitled to Treaty benefit (and in both cases is not resident, established or incorporated in a non-cooperative State or territory as defined in Article 238-0 A of the FTC other than those States or territories mentioned in 2° of 2 bis of the same Article 238-0 A) and has held more than 25% of our dividend rights, known as “droits aux bénéfices sociaux,” at any time during the preceding five years, either directly or indirectly, and, as relates to individuals, alone or with relatives will be subject to a levy in France at the rate of 12.8% if such U.S. holder is an individual or 25% for corporate bodies or other legal entities. Special rules apply to U.S. holders who are residents of more than one country.

Taxation of Dividends

Dividends paid by a French corporation to beneficial owners that are non-residents of France are generally subject to French withholding tax at a rate of 12.8% when the recipient is an individual and 25% otherwise. Dividends paid by a French corporation in a non-cooperative State or territory, as defined in Article 238-0 A of the FTC other than those States or territories mentioned in 2° of 2 bis of the same Article 238-0 A, may be subject to French withholding tax at a rate of 75%. However, eligible U.S. holders, other than individuals subject to the French withholding tax at a rate of 12.8%, entitled to Treaty benefits under the “Limitation on Benefits” provision contained in the Treaty who are U.S. residents, as defined pursuant to the provisions of the Treaty, will not be subject to this 25% or 75% withholding tax rate, but may be subject to the withholding tax at a reduced rate (as described below).

Under the Treaty, the rate of French withholding tax on dividends paid to an eligible U.S. holder who is a U.S. resident as defined pursuant to the provisions of the Treaty and the beneficial owner of these dividends and whose ownership of the ordinary shares or ADSs is not effectively connected with a permanent establishment or fixed base that such U.S. holder has in France, may be reduced to 15%, or to 5% if such U.S. holder is a corporation and owns directly or indirectly at least 10% of the share capital of the issuer; such U.S. holder may claim a refund from the French tax authorities of the amount withheld in excess of the Treaty rates of 15% or 5%, if any.

For U.S. holders that are not individuals but are U.S. residents, as defined pursuant to the provisions of the Treaty, the requirements for eligibility for Treaty benefits, including the reduced 5% or 15% withholding tax rates contained in the “Limitation on Benefits” provision of the Treaty, are complex, and certain technical changes were made to these requirements by the protocol of January 13, 2009. U.S. holders are advised to consult their own tax advisors regarding their eligibility for Treaty benefits in light of their own particular circumstances.

Dividends paid to an eligible U.S. holder may immediately be subject to the reduced rates of 5% or 15% provided that:

•

such holder establishes before the date of payment that it is a U.S. resident under the Treaty by completing and providing the depositary with a treaty form (Form 5000) in accordance with the French guidelines (BOI-INT-DG-20-20-20-20-12/09/2012); or

•

the depositary or other financial institution managing the securities account in the United States of such holder provides the French paying agent with a document listing certain information about the U.S. holder and its ordinary shares or ADSs and a certificate whereby the financial institution managing the U.S. holder’s securities account in the United States takes full responsibility for the accuracy of the information provided in the document.

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Otherwise, dividends paid to a U.S. holder, other than individuals subject to the French withholding tax at a rate of 12.8%, will be subject to French withholding tax at the rate of 25%, or 75% if paid in a non-cooperative State or territory (as defined in Article 238-0 A of the FTC, other than those States or territories mentioned in 2° of 2 bis of the same Article 238-0 A), and then reduced at a later date to 5% or 15%, provided that such holder duly completes and provides the French tax authorities with the treaty forms Form 5000 and Form 5001 before December 31 of the calendar year following the year during which the dividend is paid (due to recent case law regarding the statute of limitation for filing a withholding tax claim; U.S. holders are advised to consult their own tax advisors in this respect).

Certain qualifying pension funds and certain other tax-exempt entities are subject to the same general filing requirements as other U.S. holders except that they may have to supply additional documentation evidencing their entitlement to these benefits.

Form 5000 and Form 5001, together with instructions, will be provided by the depositary to all U.S. holders registered with the depositary. The depositary will arrange for the filing with the French tax authorities of all such forms properly completed and executed by U.S. holders of ordinary shares or ADSs and returned to the depositary in sufficient time so that they may be filed with the French tax authorities before the distribution in order to immediately obtain a reduced withholding tax rate. Otherwise, the depositary must withhold tax at the full rate of 25% or 75% as applicable. In that case, the U.S. holders may claim a refund from the French tax authorities of the excess withholding tax.

Since the withholding tax rate applicable under French domestic law to U.S. holders who are individuals does not exceed the cap provided in the Treaty (i.e. 15%), the 12.8% rate shall apply, without any reduction provided under the Treaty.

Besides, please note that pursuant to Article 235 quater of the FTC and under certain conditions (in particular reporting obligations), a corporate U.S. holder which is in a tax loss position for the fiscal year during which the dividend is received may be entitled to a deferral regime, and obtain a withholding tax refund. The tax deferral ends in respect of the first financial year during which this U.S. holder is in a profit making position, as well as in the cases set out in Article 235 quater of the FTC. Also, pursuant to Article 235 quinquies of the FTC and under certain conditions, a corporate U.S. Holder may be entitled to a refund of a fraction of the withholding tax, up to the difference between the withholding tax paid (on a gross basis) and the withholding tax based on the dividend net of the expenses incurred for the acquisition and conservation directly related to the income, provided (i) that these expenses would have been tax deductible had the U.S. Holder been established in France, and (ii) that the tax rules in the United States do not allow the U.S. Holder to offset the withholding tax.

Real Estate Wealth Tax

On January 1, 2018, the French wealth tax was replaced with a real estate wealth tax (impôt sur la fortune immobilière, or IFI). Individuals holding directly or indirectly through one or more legal entities real estate assets or rights with a value exceeding €1,300,000 may fall within the scope of the IFI. A general exclusion applies to real estate assets owned by companies carrying out a commercial or industrial activity when the taxpayer (together with the members of his/her household) holds directly or indirectly less than 10% of the share capital and voting rights of the company. Ordinary shares or ADSs owned by a U.S. holder should not fall within the scope of the IFI provided that such U.S. holder does not own (together with the members of his/her household) directly or indirectly a shareholding exceeding 10% of the financial rights and voting rights of our share capital. U.S. holders holding directly or indirectly a shareholding exceeding 10% of the financial rights and voting rights of our share capital should seek additional advice.

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LEGAL MATTERS

Cooley LLP, New York, New York, is representing the Company in connection with this offering. Gide Loyrette Nouel A.A.R.P.I., Paris, France will pass upon the validity of the ordinary shares represented by the ADSs offered hereby and other legal matters concerning this offering relating to French law, including matters of French income tax law. Paul Hastings LLP, New York, New York, is representing the sales agent in connection with this offering.

EXPERTS

The consolidated financial statements of DBV Technologies SA. as of December 31, 2025, and 2024 and for each of the years in the two-year period ended December 31, 2025, have been incorporated herein by reference to DBV Technologies’ Annual Report on Form 10-K for the year ended December 31, 2025, in reliance upon the report of Deloitte & Associés and KPMG S.A., independent registered public accounting firms, incorporated by reference herein, and upon the authority of such firms as experts in auditing and accounting.

The offices of Deloitte & Associés are located at 6, place de la Pyramide, 92908 Paris-la-Défense Cedex, Puteaux, France.

The offices of KPMG S.A. are located at 2, avenue Gambetta, CS 60055, 92066 Paris-la-Défense, France.

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WHERE YOU CAN FIND MORE INFORMATION

We file annual, quarterly and current reports, proxy statements and other information with the SEC. The SEC maintains a website that contains reports and information statements and other information about issuers, such as ourselves, who file electronically with the SEC. The address of that website is www.sec.gov. Unless specifically listed under “Incorporation of Certain Information by Reference” below, the information contained on the SEC’s website is not intended to be incorporated by reference in this prospectus supplement or in the accompanying prospectus, and you should not consider that information a part of this prospectus supplement.

Our ordinary shares are listed on the regulated market of Euronext Paris and on the Nasdaq Capital Market, the latter in the form of ADSs. You can consult reports and other information about us that are filed pursuant to the rules of the regulated market of Euronext Paris and of the Nasdaq Capital Market at these exchanges.

You may request a copy of this prospectus supplement, the accompanying prospectus and any of the information that is incorporated by reference in this prospectus supplement and any document summarized in this prospectus supplement, without charge, upon written or oral request. If you would like to obtain this information from us, please direct your request, either in writing or by telephone, to Investor Relations, DBV Technologies S.A., 107 avenue de la République, 92320 Châtillon France, or Tel. + 33 1 55 42 78 78.

We also maintain a website at www.dbv-technologies.com through which you can access our SEC filings. The information set forth on our website is not part of, and is not incorporated by reference in, this prospectus supplement.

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INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The SEC allows us to “incorporate by reference” information into this prospectus supplement, which means that we can disclose important information to you by referring you to another document filed separately with the SEC. The SEC file number for the documents incorporated by reference in this prospectus supplement is 001-36697. The documents incorporated by reference into this prospectus supplement contain important information that you should read about us.

This prospectus supplement incorporates by reference the documents set forth below that have previously been filed with the SEC:

•

Our Annual Report on Form 10-K for the fiscal year ended December 31, 2025, filed with the SEC on March 26, 2026;

•

the Part III information in our Annual Report on Form 10-K for the year ended December 31, 2025, included in the Form 10-K/A filed with the SEC on April 30, 2026;

•

Our Quarterly Report on Form 10-Q for the quarter ended March 31, 2026 and June 30, 2026, filed with the SEC on April 30, 2026 and July 16, 2026,

•

We also incorporate by reference into this prospectus supplement all documents (other than current reports furnished under Item 2.02 or Item 7.01 of Form 8-K and exhibits filed on such form that are related to such items) that are filed by us with the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this prospectus supplement but prior to the termination of the offering.

Unless expressly incorporated by reference, nothing in this prospectus supplement shall be deemed to incorporate by reference information furnished to, but not filed with, the SEC. We will provide to each person, including any beneficial owner, to whom a prospectus supplement is delivered, without charge upon written or oral request, a copy of any or all of the documents that are incorporated by reference into this prospectus supplement but not delivered with the prospectus supplement, including exhibits that are specifically incorporated by reference into such documents. You should direct any requests for documents, either in writing to Corporate Secretary, c/o DBV Technologies S.A., 107 Avenue de la République, 92320 Châtillon, France or by telephone at +33 1 55 42 78 78.

Any statement contained in this prospectus supplement or contained in a document incorporated or deemed to be incorporated by reference into this prospectus supplement will be deemed to be modified or superseded to the extent that a statement contained in this prospectus supplement, or document deemed to be incorporated by reference into this prospectus supplement, modifies or supersedes such statement.

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LOGO

Up to $150,000,000 of

American Depositary Shares Representing Ordinary Shares

PROSPECTUS SUPPLEMENT

Citizens Capital Markets

July 27, 2026

PART II

INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14. Other Expenses of Issuance and Distribution

The following table sets forth the estimated costs and expenses, other than underwriting discounts and commissions, payable by us in connection with the offering of the securities being registered. All the amounts shown are estimates, except for the SEC registration fee and FINRA filing fee.


SEC registration fee	$	(1	)
Accountants’ fees and expenses		(2	)
Legal fees and expenses		(2	)
Printing and miscellaneous expenses		(2	)

Miscellaneous expenses		(2	)
Total	$	(2	)

(1)

In accordance with Rules 456(b) and 457(r), the Registrant is deferring payment of all applicable registration fees for the securities offered under this registration statement other than with respect to the registration fees in connection with the offering of up to $150,000,000 of our American Depositary Shares that may be issued and sold from time to time under the Sales Agreement with Citizens JMP Securities, LLC. The registrant previously paid $20,404.08 relating to unsold securities under a registration statement filed on Form S-3 (File No. 333-271166), which amount will be applied to this registration statement.

(2)

These fees are calculated based on the securities offered and the number of issuances and accordingly cannot be estimated at this time. An estimate of the aggregate expenses in connection with the sale and distribution of securities being offered will be included in the applicable prospectus supplement.

Item 15. Indemnification of Officers and Directors

Under French law, provisions of by-laws that limit the liability of directors are prohibited. However, French law allows sociétés anonymes to contract for and maintain liability insurance against civil liabilities incurred by any of their directors and officers involved in a third-party action, provided that they acted in good faith and within their capacities as directors or officers of the company. Criminal liability cannot be indemnified under French law, whether directly by the company or through liability insurance.

We maintain liability insurance for our directors and officers, including insurance against liability under the Securities Act of 1933, as amended, or the Securities Act, and we have entered into agreements with our directors and executive officers to provide contractual indemnification. With certain exceptions and subject to limitations on indemnification under French law, these agreements will provide for indemnification for damages and expenses including, among other things, attorneys’ fees, judgments, fines and settlement amounts incurred by any of these individuals in any action or proceeding arising out of his or her actions in that capacity.

These agreements may discourage shareholders from bringing a lawsuit against our directors and executive officers for breach of their fiduciary duty. These provisions also may have the effect of reducing the likelihood of derivative litigation against directors and executive officers, even though such an action, if successful, might otherwise benefit us and our shareholders. Furthermore, a shareholder’s investment may be adversely affected to the extent we pay the costs of settlement and damage awards against directors and officers pursuant to these insurance agreements.

Certain of our non-employee directors may, through their relationships with their employers or partnerships, be insured and/or indemnified against certain liabilities in their capacity as members of our board of directors.

In any underwriting agreement we enter into in connection with the sale of securities being registered hereby, the underwriters will agree to indemnify, under certain conditions, us, our directors, our officers and persons who control us within the meaning of the Securities Act against certain liabilities.

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Item 16. Exhibits


Exhibit	Description	Schedule/Form	File Number	Exhibit	File Date

1.1*	Form of Underwriting Agreement

1.2	Sales Agreement, dated as of September 5, 2025, by and between DBV Technologies S.A. and Citizens JMP Securities, LLC	Form 8-K	001-36697	1.1	09/05/2025

3.1	By-laws (status) of the registrant (English translation)	Form 8-K	001-36697	3.1	06/03/2026

4.1	Deposit Agreement	Form F-6EF	333-265201	99.(A)	05/25/2022

4.2	Amendment No. 1 to Deposit Agreement	Form F-6 POS	333-266202	99.(A)(I)	05/17/2024

4.3	Form of Amendment No. 2 to Deposit Agreement	Form F-6 POS	333-266202	99.(A)(I)	11/12/2024

4.4	Form of American Depositary Receipt	Form F-6 POS	333-266202	99.(A)(I)	11/12/2024

4.5*	Form of Warrant

5.1**	Opinion of Gide Loyrette Nouel, AARPI

5.2**	Opinion of Gide Loyrette Nouel, AARPI

23.1**	Consent of Deloitte & Associés

23.2**	Consent of KPMG S.A.

23.3**	Consent of Gide Loyrette Nouel, AARPI (included in Exhibit 5.1)

23.4**	Consent of Gide Loyrette Nouel, AARPI (included in Exhibit 5.2)

24.1**	Power of Attorney (included on the signature page of this report).

107**	Filing Fee Table

*	To be subsequently filed, if applicable, by an amendment to this registration statement or as an exhibit to a report pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, including any Report on Form 8-K, and incorporated herein by reference.

**	Filed herewith.

Item 17. Undertakings

(a) The undersigned registrant hereby undertakes:

(1) To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:

(i) To include any prospectus required by Section 10(a)(3) of the Securities Act;

(ii) To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate,

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represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the SEC pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than 20 percent change in the maximum aggregate offering price set forth in the “Calculation of Registration Fee” table in the effective registration statement; and

(iii) To include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement;

provided, however, that the undertakings set forth in paragraphs (1)(i), (1)(ii) and (1)(iii) above do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the SEC by the registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934, as amended, or the Exchange Act, that are incorporated by reference in this registration statement or are contained in a form of prospectus filed pursuant to Rule 424(b) that is part of this registration statement.

(2) That, for the purpose of determining any liability under the Securities Act, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(3) To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

(4) That, for the purpose of determining liability under the Securities Act to any purchaser:

(i) Each prospectus filed by the registrant pursuant to Rule 424(b)(3) shall be deemed to be part of the registration statement as of the date the filed prospectus was deemed part of and included in the registration statement; and

(ii) Each prospectus required to be filed pursuant to Rule 424(b)(2), (b)(5), or (b)(7) as part of a registration statement in reliance on Rule 430B relating to an offering made pursuant to Rule 415(a)(1)(i), (vii), or (x) for the purpose of providing the information required by Section 10(a) of the Securities Act shall be deemed to be part of and included in the registration statement as of the earlier of the date such form of prospectus is first used after effectiveness or the date of the first contract of sale of securities in the offering described in the prospectus. As provided in Rule 430B, for liability purposes of the issuer and any person that is at that date an underwriter, such date shall be deemed to be a new effective date of the registration statement relating to the securities in the registration statement to which that prospectus relates, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof. Provided, however, that no statement made in a registration statement or prospectus that is part of the registration statement or made in a document incorporated or deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of contract of sale prior to such effective date, supersede or modify any statement that was made in the registration statement or prospectus that was part of the registration statement or made in any such document immediately prior to such effective date.

(5) That, for the purpose of determining liability of the registrant under the Securities Act to any purchaser in the initial distribution of the securities, the undersigned registrant undertakes that in a primary offering of securities of the undersigned registrant pursuant to this registration statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser: (i) any preliminary prospectus or prospectus of the undersigned

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registrant relating to the offering required to be filed pursuant to Rule 424; (ii) any free writing prospectus relating to the offering prepared by or on behalf of the undersigned registrant or used or referred to by the undersigned registrant; (iii) the portion of any other free writing prospectus relating to the offering containing material information about the undersigned registrant or its securities provided by or on behalf of the undersigned registrant; and (iv) any other communication that is an offer in the offering made by the undersigned registrant to the purchaser.

(b) The undersigned Registrant hereby undertakes that, for purposes of determining any liability under the Securities Act, each filing of the registrant’s annual report pursuant to Section 13(a) or 15(d) of the Exchange Act (and, where applicable, each filing of an employee benefit plan’s annual report pursuant to Section 15(d) of the Exchange Act) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(h) Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the SEC such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in Châtillon, France, on July 27, 2026.


DBV TECHNOLOGIES S.A.

By:		/s/ Daniel Tassé
Name:		Daniel Tassé
Title:		Chief Executive Officer

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints Daniel Tassé and Virginie Boucinha, jointly and severally, as his or her true and lawful agent, proxy and attorneys-in-fact, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to (i) act on, sign and file with the Securities and Exchange Commission any and all amendments (including post-effective amendments) to this registration statement together with all schedules and exhibits thereto and any subsequent registration statement filed pursuant to Rule 462(b) under the Securities Act of 1933, as amended, together with all schedules and exhibits thereto, (ii) act on, sign and file such certificates, instruments, agreements and other documents as may be necessary or appropriate in connection therewith, (iii) act on and file any supplement to any prospectus included in this registration statement or any such amendment or any subsequent registration statement filed pursuant to Rule 462(b) under the Securities Act of 1933, as amended, and (iv) take any and all actions which may be necessary or appropriate to be done, as fully for all intents and purposes as he or she might or could do in person, hereby approving, ratifying and confirming all that such agent, proxy and attorney-in-fact or any of his substitutes may lawfully do or cause to be done by virtue thereof.

Pursuant to the requirements of the Securities Act, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.


Signature	Title	Date

/s/ Daniel Tassé Daniel Tassé	Chief Financial Officer and Director (Principal Executive Officer)	July 27, 2026

/s/ Virginie Boucinha Virginie Boucinha	Chief Financial Officer (Principal Financial and Accounting Officer)	July 27, 2026

/s/ Michel de Rosen Michel de Rosen	Director	July 27, 2026

/s/ Maïlys Ferrère Maïlys Ferrère	Director	July 27, 2026

/s/ Michael J. Goller Michael J. Goller	Director	July 27, 2026

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/s/ Danièle Guyot-Caparros Danièle Guyot-Caparros	Director	July 27, 2026

/s/ Timothy E. Morris Timothy E. Morris	Director	July 27, 2026

/s/ Adora Ndu Adora Ndu	Director	July 27, 2026

/s/ Julie O’Neill Julie O’Neill	Director	July 27, 2026

/s/ Ravi Madduri Rao Ravi Madduri Rao	Director	July 27, 2026

/s/ Philina Lee Philina Lee	Director	July 27, 2026

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SIGNATURE OF AUTHORIZED REPRESENTATIVE IN THE UNITED STATES

Pursuant to the requirements of the Securities Act of 1933, as amended, the undersigned, the duly authorized representative in the United States of DBV Technologies S.A. has signed this Registration Statement on July 27, 2026.


DBV TECHNOLOGIES INC.

By:		/s/ Michele Robertson
Name:		Michele Robertson
Title:		Chief Legal Officer, Vice President

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