SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 11)

ALLURION TECHNOLOGIES, INC.

(Name of Issuer)

Common Stock, par value $0.0001 per share

(Title of Class of Securities)

Roderick Wong, M.D.
RTW Investments, LP, 40 10th Avenue, Floor 7
New York, NY, 10014
(646) 597-6980

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

02/26/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. Checkbox not checked

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13D

CUSIP Number(s):

Name of reporting person

RTW Investments, LP

Check the appropriate box if a member of a Group (See Instructions)

(a)

(b)

SEC use only

Source of funds (See Instructions)

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

Checkbox not checked

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 5,891,430.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 5,891,430.00

Aggregate amount beneficially owned by each reporting person

5,891,430.00

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in Row (11)

39.4 %

Type of Reporting Person (See Instructions)

IA, PN

SCHEDULE 13D

CUSIP Number(s):

Name of reporting person

RTW Master Fund, Ltd.

Check the appropriate box if a member of a Group (See Instructions)

(a)

(b)

SEC use only

Source of funds (See Instructions)

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

Checkbox not checked

Citizenship or place of organization

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 3,138,798.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 3,138,798.00

Aggregate amount beneficially owned by each reporting person

3,138,798.00

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in Row (11)

21.0 %

Type of Reporting Person (See Instructions)

SCHEDULE 13D

CUSIP Number(s):

Name of reporting person

RTW Innovation Master Fund, Ltd.

Check the appropriate box if a member of a Group (See Instructions)

(a)

(b)

SEC use only

Source of funds (See Instructions)

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

Checkbox not checked

Citizenship or place of organization

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 2,427,089.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 2,427,089.00

Aggregate amount beneficially owned by each reporting person

2,427,089.00

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in Row (11)

16.2 %

Type of Reporting Person (See Instructions)

SCHEDULE 13D

CUSIP Number(s):

Name of reporting person

Roderick Wong

Check the appropriate box if a member of a Group (See Instructions)

(a)

(b)

SEC use only

Source of funds (See Instructions)

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

Checkbox not checked

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 5,891,430.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 5,891,430.00

Aggregate amount beneficially owned by each reporting person

5,891,430.00

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in Row (11)

39.4 %

Type of Reporting Person (See Instructions)

HC, IN

SCHEDULE 13D

Item 1.

Security and Issuer

(a)

Title of Class of Securities:

Common Stock, par value $0.0001 per share

(b)

Name of Issuer:

ALLURION TECHNOLOGIES, INC.

(c)

Address of Issuer's Principal Executive Offices:

11 Huron Drive, Natick, MASSACHUSETTS , 01760.

Item 5.

Interest in Securities of the Issuer

(a)

Items 5(a)-(c) of the Schedule 13D are hereby amended and supplemented as follows: The aggregate percentage of Shares reported to be beneficially owned by the Reporting Persons is based upon the sum of (i) 12,279,181 Shares outstanding as of January 5, 2026 as reported in the Issuer's prospectus dated January 16, 2026 filed with the Securities and Exchange Commission (the "SEC") on January 20, 2026 and (ii) 2,659,565 Shares issued pursuant to an Inducement Offer to Exercise Common Stock Purchase Warrants dated February 24, 2026, which closed on February 26, 2026.

(b)

See rows (7) through (10) of the cover pages to this Schedule 13D/A for the number of shares of Common Stock as to which each Reporting Person has the sole or shared power to vote or direct the vote and sole or shared power to dispose or to direct the disposition.

(c)

No transactions with respect to the securities of the Issuer have been effected during the past sixty days by any Reporting Person. The percentage ownership reported in this Schedule 13D/A reflect an increase in the number of outstanding shares of the Issuer.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

RTW Investments, LP

Signature:	/s/ Roderick Wong, M.D.
Name/Title:	Roderick Wong, M.D., Managing Partner
Date:	03/02/2026

RTW Master Fund, Ltd.

Signature:	/s/ Darshan Patel
Name/Title:	Darshan Patel, Director
Date:	03/02/2026

RTW Innovation Master Fund, Ltd.

Signature:	/s/ Darshan Patel
Name/Title:	Darshan Patel, Director
Date:	03/02/2026

Roderick Wong

Signature:	/s/ Roderick Wong, M.D.
Name/Title:	Roderick Wong, M.D.
Date:	03/02/2026

Amendment: SEC Form SCHEDULE 13D/A filed by Allurion Technologies Inc.