Ardelyx (NASDAQ: ARDX) plans RSU tax-cover sale of 10,500 shares

Rhea-AI Filing Summary

ARDELYX, INC. (ARDX) has a notice under Rule 144 for potential sales of common stock by Laura A. Williams. The notice covers 10,500 shares of common stock, with an aggregate market value of $42,315.00, based on an issuer share count of 249,187,572 shares as of the notice. The shares relate to the 08/19/2026 vesting of 24,041 restricted stock units, characterized as issued for services rendered. The issuer states the sales are pursuant to an automatic sell-to-cover mechanism imposed by the original RSU grant, with shares to be sold solely to cover applicable withholding taxes. In the prior three months, Williams reported multiple sales, including 81,898 shares for $490,487.12 on 06/18/2026.

Key Figures

Shares covered by current notice: 10,500 shares of Common Stock Aggregate market value of shares covered: $42,315.00 Shares outstanding reference: 249,187,572 shares +4 more

7 metrics

Shares covered by current notice 10,500 shares of Common Stock Rule 144 notice for Laura A. Williams

Aggregate market value of shares covered $42,315.00 Value associated with 10,500 shares in the notice

Shares outstanding reference 249,187,572 shares Issuer share count referenced in securities information

RSUs vesting 24,041 restricted stock units Vesting on 08/19/2026 for services rendered

Largest recent sale 81,898 shares for $490,487.12 Sale on 06/18/2026 reported in past 3 months

Recent smaller sale example 1,503 shares for $9,420.05 Sale of common stock on 05/21/2026

Date of Notice 08/21/2026 Form 144 notice date

Key Terms

Rule 144, restricted stock units (RSUs), 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 (RSUs) financial

"initial grant of the restricted stock units (RSUs) awards, the shares"

Restricted stock units (RSUs) are a type of company promise to give employees shares of stock in the future, usually after certain conditions like working for a set time. They are like a gift promised today that you receive later, which can become valuable if the company's stock price goes up. RSUs matter because they are a way companies reward employees and can be a significant part of compensation.

sell-to-cover financial

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

Sell-to-cover is when part of newly issued or exercised company stock is immediately sold to pay required taxes and fees, so the recipient keeps the remaining shares. For investors this matters because it reduces the number of shares insiders or employees actually hold after a grant, can create small, routine share sales that aren’t signal of cashing out, and slightly increases share supply on the market—like selling a portion of a paycheck to cover the tax bill.

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 disclose for ARDX and Laura A. Williams?

It discloses a Rule 144 notice for potential sale of 10,500 shares of Ardelyx common stock by Laura A. Williams, related to vested RSUs, with an indicated aggregate value of $42,315.00 and sales intended solely to cover applicable withholding taxes.

How many ARDX shares are covered by the current Rule 144 notice?

The notice covers 10,500 shares of Ardelyx common stock, with an aggregate market value listed as $42,315.00 at the time of the notice.

What RSU vesting event underlies the planned ARDX share sales?

The sales relate to the 08/19/2026 vesting of 24,041 restricted stock units, described as issued by the issuer for services rendered.

What is the stated purpose of the ARDX share sales in this Form 144?

The filing states that, under an automatic sell-to-cover feature of the original RSU awards, shares are to be sold upon vesting solely to cover applicable withholding taxes.

What ARDX share sales has Laura A. Williams reported in the last three months?

Reported sales in the past three months include several transactions on 05/21/2026 and a larger transaction on 06/18/2026 of 81,898 shares for $490,487.12, all in Ardelyx common stock.

What share count for ARDX is referenced in the Form 144?

The securities information section references 249,187,572 shares of Ardelyx common stock, presented in connection with the issuer’s share data at the time of the notice.

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Available on EDGAR 08/21/2026 - 07:38 PM Accepted by SEC EDGAR 08/21/2026 - 07:38 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	0001869194
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	617 675-2739
Name of Person for Whose Account the Securities are To Be Sold	Williams Laura A
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	10500	42315.00	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			24041	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
Laura A. Williams 400 Fifth Avenue, Suite 210 Waltham MA 02451	Common Stock	05/21/2026	1503	9420.05
Laura A. Williams 400 Fifth Avenue, Suite 210 Waltham MA 02451	Common Stock	05/21/2026	2157	13519.00
Laura A. Williams 400 Fifth Avenue, Suite 210 Waltham MA 02451	Common Stock	05/21/2026	1911	11977.19
Laura A. Williams 400 Fifth Avenue, Suite 210 Waltham MA 02451	Common Stock	05/21/2026	1418	8887.32
Laura A. Williams 400 Fifth Avenue, Suite 210 Waltham MA 02451	Common Stock	06/18/2026	81898	490487.12

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)