144: Filer Information

Filer CIK

0001321402

Filer CCC

XXXXXXXX

Is this a LIVE or TEST Filing?

LIVE

TEST

Submission Contact Information

Name

Phone

E-Mail Address

144: Issuer Information

Name of Issuer

ARDELYX INC

SEC File Number

001-36485

Address of Issuer

400 Fifth Avenue Suite 210
Waltham
MASSACHUSETTS
02451

Phone

6176752739

Name of Person for Whose Account the Securities are To Be Sold

MICHAEL RAAB

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

Director

Relationship to Issuer

Officer

144: Securities Information

Title of the Class of Securities To Be Sold

Name and Address of the Broker

Number of Shares or Other Units To Be Sold

Aggregate Market Value

Number of Shares or Other Units Outstanding

Approximate Date of Sale

Name the Securities Exchange

Common

Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York � NY � 10004

125000

711250.00

247029387

06/15/2026

NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class

Date you Acquired

Nature of Acquisition Transaction

Name of Person from Whom Acquired

Is this a Gift?

Date Donor Acquired

Amount of Securities Acquired

Date of Payment

Nature of Payment *

Common

06/15/2026

Exercise of Stock Options

Issuer

62500

06/15/2026

Cash

Common

08/19/2024

Restricted Stock Units

Issuer

58795

08/19/2024

N/A

Common

02/29/2024

Employee Stock Purchase Plan

Issuer

3705

02/29/2024

Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller

Title of Securities Sold

Date of Sale

Amount of Securities Sold

Gross Proceeds

MICHAEL G. RAAB
400 Fifth Avenue Suite 210
Waltham � MA � 02451

Common

05/21/2026

54748

343133.09

10b5-1 Sales for MICHAEL G. RAAB
400 Fifth Avenue Suite 210
Waltham � MA � 02451

Common

05/15/2026

41666

261610.40

10b5-1 Sales for MICHAEL G. RAAB
400 Fifth Avenue Suite 210
Waltham � MA � 02451

Common

04/15/2026

41668

261954.22

10b5-1 Sales for MICHAEL G. RAAB
400 Fifth Avenue Suite 210
Waltham � MA � 02451

Common

03/16/2026

41666

243329.44

144: Remarks and Signature

Remarks

The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale. The securities to be sold were acquired upon the vesting of restricted stock units during the period of 08/19/2024 through 02/19/2025 The securities to be sold were acquired upon the purchase of employee stock purchase plan shares during the period of 02/29/2024 through 02/28/2025.

Date of Notice

06/15/2026

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

11/07/2025

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

/s/ Michael Raab

144: Filer Information

Submission Contact Information

144: Issuer Information

144: Securities Information

144: Securities To Be Sold

144: Securities Sold During The Past 3 Months

144: Remarks and Signature

ATTENTION:

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

SEC Form 144 filed by Ardelyx Inc.