Ardelyx (ARDX) officer to sell 11,900 shares for RSU taxes

Rhea-AI Filing Summary

ARDELYX, INC. (ARDX) is the issuer for a notice of proposed sale of securities filed for the account of officer Eric Duane Foster under Rule 144. The filing indicates a planned sale of 11,900 shares of common stock through Morgan Stanley Smith Barney LLC, with an approximate aggregate market value of $47,957.00 as of the notice. The shares relate to the vesting of restricted stock units on 08/19/2026, with the issuer listed as the party from whom the securities were acquired for services rendered. The remarks state that the sale is pursuant to an automatic sell-to-cover feature to cover applicable withholding taxes upon vesting.

The notice also lists sales of ARDELYX common stock by Eric Duane Foster during the prior three months on 05/21/2026 in three transactions of 3,166, 2,427, and 2,405 shares, for consideration of $19,842.91, $15,211.22, and $15,073.34, respectively.

Key Figures

Proposed shares to be sold: 11,900 shares of common stock Aggregate market value of proposed sale: $47,957.00 Date of RSU vesting: 08/19/2026 +3 more

6 metrics

Proposed shares to be sold 11,900 shares of common stock Planned Rule 144 sale through Morgan Stanley Smith Barney LLC

Aggregate market value of proposed sale $47,957.00 Estimated value for 11,900 shares in the proposed Rule 144 sale

Date of RSU vesting 08/19/2026 Shares to be sold arise from vesting of restricted stock units

Past sale 1 3,166 shares for $19,842.91 Sale of ARDELYX common stock on 05/21/2026

Past sale 2 2,427 shares for $15,211.22 Sale of ARDELYX common stock on 05/21/2026

Past sale 3 2,405 shares for $15,073.34 Sale of ARDELYX common stock on 05/21/2026

Key Terms

Rule 144, restricted stock units, automatic sell-to-cover, withholding taxes

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

restricted stock units financial

"Vesting of restricted stock units | Issuer | | | 28415"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

automatic sell-to-cover financial

"Pursuant to an automatic sell-to-cover imposed by the terms of the initial grant"

withholding taxes financial

"shares are to be sold upon the vesting of the RSUs solely to cover applicable withholding taxes"

Withholding taxes are amounts a payer or government takes out of payments — such as wages, interest, or dividends — before the recipient gets the money, functioning like a cashier keeping part of a bill to pay taxes on your behalf. For investors this matters because it reduces the cash they actually receive, affects net returns and yield calculations, and may require additional paperwork or treaty claims to recover or offset the withheld amount against final tax bills.

FAQ

What does the Form 144 filing for ARDX disclose about Eric Duane Foster's planned stock sale?

The notice discloses a proposed sale of 11,900 shares of ARDELYX, INC. common stock by officer Eric Duane Foster under Rule 144, with an indicated aggregate market value of approximately $47,957.00, in connection with vesting of restricted stock units on 08/19/2026.

How will the ARDX shares from Eric Duane Foster's RSUs be sold according to the Form 144?

The remarks state that, under the terms of the initial RSU grants, the shares are subject to an automatic sell-to-cover upon vesting, and the shares are to be sold solely to cover applicable withholding taxes related to those restricted stock units.

Which broker is listed in the ARDX Form 144 for handling the proposed stock sale?

The broker listed is Morgan Stanley Smith Barney LLC, Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004, for the proposed sale of 11,900 shares of ARDELYX common stock.

What prior ARDX stock sales by Eric Duane Foster are reported in the last three months?

The filing reports three ARDELYX common stock sales on 05/21/2026 by Eric Duane Foster: 3,166 shares for $19,842.91, 2,427 shares for $15,211.22, and 2,405 shares for $15,073.34.

What is the relationship of Eric Duane Foster to ARDELYX, INC. in this Form 144?

Eric Duane Foster is identified as an Officer of ARDELYX, INC. in the Form 144, and the notice covers sales of the issuer’s common stock for his account under Rule 144.

On what date was the Form 144 notice for ARDX filed for Eric Duane Foster?

The Form 144 notice for ARDELYX, INC. common stock sales by Eric Duane Foster is dated 08/21/2026, covering proposed sales related to RSU vesting on 08/19/2026 and listing sales made on 05/21/2026.

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Available on EDGAR 08/21/2026 - 06:29 PM Accepted by SEC EDGAR 08/21/2026 - 06:28 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002034148
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	510-745-7047
Name of Person for Whose Account the Securities are To Be Sold	Foster Eric Duane
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	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 Stock	Morgan Stanley Smith Barney LLC, Executive Financial Services 1 New York Plaza, 8th Floor New York NY 10004	11900	47957.00	249187572	08/21/2026	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 Stock	08/19/2026	Vesting of restricted stock units	Issuer			28415	08/19/2026	Services Rendered

* 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
Eric Duane Foster 400 Fifth Avenue, Suite 210 Waltham MA 02451	Common Stock	05/21/2026	3166	19842.91
Eric Duane Foster 400 Fifth Avenue, Suite 210 Waltham MA 02451	Common Stock	05/21/2026	2427	15211.22
Eric Duane Foster 400 Fifth Avenue, Suite 210 Waltham MA 02451	Common Stock	05/21/2026	2405	15073.34

144: Remarks and Signature

Remarks	Pursuant to an automatic sell-to-cover imposed by the terms of the initial grant of the restricted stock units (RSUs) awards, the shares are to be sold upon the vesting of the RSUs solely to cover applicable withholding taxes.
Date of Notice	08/21/2026
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	Orlando Wells
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)