Ardelyx (NASDAQ: ARDX) officer plans stock sales and tax-cover trades

Rhea-AI Filing Summary

ARDELYX, INC. (ARDX) received a Rule 144 notice for planned sales of its common stock by officer Brady James Parker. A brokerage account at Morgan Stanley Smith Barney LLC lists 19,700 shares of common stock with an aggregate market value of $79,391.00, relative to 249,187,572 shares outstanding.

The notice also reports that 47,716 shares are to be sold in connection with the 08/19/2026 vesting of restricted stock units as compensation for services rendered, with sales described as being pursuant to an automatic sell-to-cover arrangement to satisfy applicable withholding taxes. During the prior three months, 1,846 shares of common stock were sold for $11,569.81.

Key Figures

Shares proposed for sale (broker section): 19,700 shares Aggregate market value of proposed sale: $79,391.00 Shares outstanding: 249,187,572 shares +5 more

8 metrics

Shares proposed for sale (broker section) 19,700 shares Common Stock with aggregate market value of $79,391.00

Aggregate market value of proposed sale $79,391.00 Value of 19,700 shares of Common Stock in broker information

Shares outstanding 249,187,572 shares Common Stock outstanding referenced in the notice

Shares to be sold from RSU vesting 47,716 shares Common Stock tied to 08/19/2026 vesting of restricted stock units

Recent shares sold 1,846 shares Common Stock sold on 05/21/2026 during the past three months

Proceeds from recent sale $11,569.81 Total consideration for 1,846 shares sold on 05/21/2026

RSU vesting date 08/19/2026 Date of vesting for restricted stock units leading to share sales

Date of Notice 08/21/2026 Date on which the Rule 144 notice was signed

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 | | | 47716"

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 disclose for ARDX?

The filing discloses planned sales of Ardelyx, Inc. (ARDX) common stock under Rule 144 by officer Brady James Parker, including 19,700 shares with an aggregate market value of $79,391.00 and additional shares tied to restricted stock unit vesting and tax withholding.

How many ARDX shares are referenced as outstanding in this notice?

The notice references 249,187,572 shares of Ardelyx, Inc. common stock as outstanding, providing context for the size of the proposed Rule 144 sales relative to the company’s total equity base.

What ARDX shares are linked to restricted stock unit vesting?

The filing states that 47,716 shares of Ardelyx common stock are to be sold in connection with the 08/19/2026 vesting of restricted stock units as compensation for services rendered.

How are taxes handled on the ARDX restricted stock unit vesting?

According to the remarks, shares are to be sold under an automatic sell-to-cover imposed by the terms of the restricted stock unit awards, with the shares sold upon vesting solely to cover applicable withholding taxes.

What ARDX sales occurred in the last three months before this Form 144?

The notice reports that on 05/21/2026, 1,846 shares of Ardelyx common stock were sold for total proceeds of $11,569.81 during the three months preceding the filing.

Which broker is identified for the planned ARDX stock sales?

The filing identifies Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, as the broker handling the Rule 144 sales of Ardelyx common stock, with the securities listed for trading on NASDAQ.

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Available on EDGAR 08/21/2026 - 06:46 PM Accepted by SEC EDGAR 08/21/2026 - 06:46 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	0002088887
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	Brady James Parker
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	19700	79391.00	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			47716	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
James Parker Brady 400 Fifth Avenue, Suite 210 Waltham MA 02451	Common Stock	05/21/2026	1846	11569.81

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)