Ardelyx (NASDAQ: ARDX) CAO sells shares to cover RSU taxes

Q: How many ARDX shares did Joseph James Reilly sell in each trade lot?

Joseph James Reilly sold 2,872 shares of ARDX common stock in one transaction and 1,110 shares in another, both on August 21, 2026, for a combined total of 3,982 shares sold.

Q: Why were ARDX shares sold by Joseph James Reilly on August 21, 2026?

The filing states the ARDX shares were sold pursuant to an automatic sell-to-cover feature of the original RSU grants. The shares were sold upon RSU vesting solely to cover applicable withholding taxes, rather than as a discretionary open-market sale.

Q: Were the August 21, 2026 ARDX insider sales made under a Rule 10b5-1 plan?

The Rule 10b5-1 checkbox is not marked as affirmative for this filing. The footnote instead explains that the sales resulted from an automatic sell-to-cover mechanism tied to RSU vesting to satisfy tax withholding obligations.

Filing Impact

(Neutral)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

ARDELYX, INC. (ARDX) reported that Senior Vice President and Chief Accounting Officer Joseph James Reilly sold a total of 3,982 shares of common stock on August 21, 2026. According to the disclosure, these sales were an automatic sell-to-cover triggered by the vesting of restricted stock units and were executed solely to cover applicable withholding taxes, at a weighted average price of $3.8569 per share across multiple trades.

Insider Trade Summary

Net Seller: 3,982 shares

Net Sell 2 txns

Insider Reilly Joseph James

Role See Remarks

Sold 3,982 shs ($15K)

Type	Security	Shares	Price	Value
Sale	Common Stock ^F1	2,872	$3.8569	$11K
Sale	Common Stock ^F1	1,110	$3.8569	$4K

Holdings After Transaction: Common Stock — 145,854 shares (Direct)

Footnotes (1)

F1. Pursuant to an automatic sell-to-cover imposed by the terms of the initial grant of the restricted stock units ("RSUs") awards, the shares were sold upon the vesting of the RSUs solely to cover applicable withholding taxes. The transaction was executed in multiple trades in prices ranging from $3.648 to $3.984, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.

Key Figures

Shares sold (lot 1): 2,872 shares of Common Stock Shares sold (lot 2): 1,110 shares of Common Stock Total shares sold: 3,982 shares of Common Stock +2 more

5 metrics

Shares sold (lot 1) 2,872 shares of Common Stock Sale on August 21, 2026 by Joseph James Reilly

Shares sold (lot 2) 1,110 shares of Common Stock Sale on August 21, 2026 by Joseph James Reilly

Total shares sold 3,982 shares of Common Stock Combined sales reported on August 21, 2026

Weighted average sale price $3.8569 per share Weighted average for trades on August 21, 2026

Trade price range $3.648 to $3.984 per share Price range for multiple trades on August 21, 2026

Key Terms

automatic sell-to-cover, restricted stock units ("RSUs"), weighted average sale price

3 terms

automatic sell-to-cover financial

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

restricted stock units ("RSUs") financial

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

Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.

weighted average sale price financial

"The price reported in Column 4 above reflects the weighted average sale price"

FAQ

What insider transaction did ARDX report for Joseph James Reilly?

ARDELYX, INC. reported that Joseph James Reilly, Senior Vice President and Chief Accounting Officer, sold 3,982 shares of common stock on August 21, 2026. The sales were related to vested RSUs and used to cover applicable withholding taxes.

At what price were the ARDX shares sold in the August 21, 2026 transaction?

The reported price for the ARDX insider sale on August 21, 2026 was a weighted average of $3.8569 per share. The trades occurred in a price range from $3.648 to $3.984 per share, inclusive.

How many ARDX shares did Joseph James Reilly sell in each trade lot?

Joseph James Reilly sold 2,872 shares of ARDX common stock in one transaction and 1,110 shares in another, both on August 21, 2026, for a combined total of 3,982 shares sold.

Why were ARDX shares sold by Joseph James Reilly on August 21, 2026?

The filing states the ARDX shares were sold pursuant to an automatic sell-to-cover feature of the original RSU grants. The shares were sold upon RSU vesting solely to cover applicable withholding taxes, rather than as a discretionary open-market sale.

Were the August 21, 2026 ARDX insider sales made under a Rule 10b5-1 plan?

The Rule 10b5-1 checkbox is not marked as affirmative for this filing. The footnote instead explains that the sales resulted from an automatic sell-to-cover mechanism tied to RSU vesting to satisfy tax withholding obligations.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/25/2026 - 07:18 PM Accepted by SEC EDGAR 08/25/2026 - 07:17 PM

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Reilly Joseph James

(Last)

(First)

(Middle)

C/O ARDELYX, INC.

400 FIFTH AVENUE, SUITE 210

(Street)

WALTHAM

MASSACHUSETTS

02451

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
ARDELYX, INC. [ ARDX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	See Remarks

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/21/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	08/21/2026		S⁽¹⁾		2,872	D	$3.8569	146,964	D
Common Stock	08/21/2026		S⁽¹⁾		1,110	D	$3.8569	145,854	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Pursuant to an automatic sell-to-cover imposed by the terms of the initial grant of the restricted stock units ("RSUs") awards, the shares were sold upon the vesting of the RSUs solely to cover applicable withholding taxes. The transaction was executed in multiple trades in prices ranging from $3.648 to $3.984, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.

Remarks:

Senior Vice President and Chief Accounting Officer

	/s/ Felecia Ettenberg, Attorney-in-Fact for Joseph J. Reilly	08/25/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR