Ardelyx officer plans 4,700-share tax-cover sale

Rhea-AI Filing Summary

ARDELYX, INC. (ARDX) officer Joseph James Reilly filed a notice of proposed sale of company common stock under Rule 144. The filing lists a planned sale of 4,700 shares through Morgan Stanley Smith Barney LLC, with an indicated aggregate value of $18,941.00, in connection with restricted stock units (RSUs) vesting on 08/19/2026. The RSUs vest for 10,388 shares, and the filing states the shares are to be sold solely to cover applicable withholding taxes under an automatic sell‑to‑cover provision. It also reports prior sales on 05/21/2026 totaling 3,719 shares at aggregate values of $16,815.70 and $6,493.13.

Key Figures

Proposed shares to be sold: 4,700 shares Proposed aggregate sale value: $18,941.00 RSU shares vesting: 10,388 shares +4 more

7 metrics

Proposed shares to be sold 4,700 shares Common Stock proposed for sale under Rule 144

Proposed aggregate sale value $18,941.00 Aggregate value for 4,700 shares of Common Stock

RSU shares vesting 10,388 shares Shares underlying restricted stock units vesting on 08/19/2026

Past sale 1 shares 2,683 shares Common Stock sold on 05/21/2026

Past sale 1 value $16,815.70 Aggregate value for 2,683 shares sold on 05/21/2026

Past sale 2 shares 1,036 shares Common Stock sold on 05/21/2026

Past sale 2 value $6,493.13 Aggregate value for 1,036 shares sold 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 | | | 10388"

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"

withholding taxes financial

"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

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing disclose for ARDX?

It discloses that officer Joseph James Reilly intends to sell 4,700 shares of Ardelyx common stock under Rule 144, with an indicated aggregate value of $18,941.00, related to the vesting of restricted stock units on 08/19/2026.

How many ARDX shares are tied to the RSU vesting in this notice?

The notice states that restricted stock units vest for 10,388 shares of Ardelyx common stock on 08/19/2026. An automatic sell-to-cover applies so that shares are sold upon vesting to cover withholding taxes.

How many ARDX shares does Joseph James Reilly plan to sell and through whom?

The filing lists a proposed sale of 4,700 shares of Ardelyx common stock, to be executed through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, New York, NY.

What were the recent ARDX share sales by Joseph James Reilly in the past 3 months?

The document reports two prior sales on 05/21/2026: one of 2,683 shares for an aggregate $16,815.70 and another of 1,036 shares for an aggregate $6,493.13.

What is the purpose of the planned ARDX share sale mentioned in the Form 144?

A remark explains that, under an automatic sell-to-cover provision in the RSU awards, the shares are to be sold upon vesting solely to cover applicable withholding taxes on the RSU vesting.

When was the Form 144 notice for ARDX dated and who signed it?

The notice is dated 08/21/2026 and is signed by Orlando Wells, in connection with the planned sale of Ardelyx common stock for the account of Joseph James Reilly.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/21/2026 - 07:13 PM Accepted by SEC EDGAR 08/21/2026 - 07:13 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	0002044416
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	Reilly Joseph James
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	4700	18941.00	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			10388	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
Joseph James Reilly 400 Fifth Avenue, Suite 210 Waltham MA 02451	Common Stock	05/21/2026	2683	16815.70
Joseph James Reilly 400 Fifth Avenue, Suite 210 Waltham MA 02451	Common Stock	05/21/2026	1036	6493.13

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)