Ardelyx (NASDAQ: ARDX) CCO sells 10,439 shares in RSU tax sale

Rhea-AI Filing Summary

Ardelyx, Inc. Chief Commercial Officer Eric Duane Foster reported open-market sales of a total of 10,439 shares of common stock on February 20, 2026, at prices between $5.7003 and $5.865 per share. According to the footnote, these trades were executed automatically to sell shares upon restricted stock unit vesting solely to cover withholding taxes. After these transactions, he directly owned 425,970 Ardelyx common shares.

Insider Trade Summary

Net Seller: 10,439 shares ($61,034)

Net Sell 4 txns

Insider Foster Eric Duane

Role Chief Commercial Officer

Sold 10,439 shs ($61K)

Type	Security	Shares	Price	Value
Sale	Common Stock	9,176	$5.865	$54K
Sale	Common Stock	1,261	$5.7138	$7K
Sale	Common Stock	1	$5.705	$5.71
Sale	Common Stock	1	$5.7003	$5.70

Holdings After Transaction: Common Stock — 427,233 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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^*

Foster Eric Duane

(Last) (First) (Middle)

C/O ARDELYX, INC.

400 FIFTH AVENUE, SUITE 210

(Street)

WALTHAM MA 02451

(City) (State) (Zip)

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)
	Chief Commercial Officer

3. Date of Earliest Transaction (Month/Day/Year)
02/20/2026

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

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

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

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	02/20/2026		S(1)		9,176	D	$5.865	427,233	D
Common Stock	02/20/2026		S(1)		1,261	D	$5.7138	425,972	D
Common Stock	02/20/2026		S(1)		1	D	$5.705	425,971	D
Common Stock	02/20/2026		S(1)		1	D	$5.7003	425,970	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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

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.

	/s/ Elizabeth Grammer, Attorney-in-fact for Eric D. Foster	02/23/2026
	** 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.

FAQ

What insider transaction did Ardelyx (ARDX) report for Eric Duane Foster?

Ardelyx reported that Chief Commercial Officer Eric Duane Foster sold 10,439 shares of common stock on February 20, 2026. The sales were tied to restricted stock unit vesting and executed to satisfy required tax withholding obligations.

At what prices did Ardelyx (ARDX) CCO Eric Duane Foster sell shares?

Eric Duane Foster’s Ardelyx share sales on February 20, 2026 occurred at prices ranging from $5.7003 to $5.865 per share. These were automatic sell-to-cover transactions related to restricted stock unit vesting and associated tax withholding.

How many Ardelyx (ARDX) shares does Eric Duane Foster hold after this Form 4?

Following the February 20, 2026 transactions, Eric Duane Foster directly held 425,970 shares of Ardelyx common stock. This figure reflects his ownership after the automatic sales used to cover withholding taxes on vested restricted stock units.

Were Eric Duane Foster’s Ardelyx (ARDX) share sales discretionary trades?

The filing indicates the sales were not discretionary trades but automatic sell-to-cover transactions. Shares were sold upon the vesting of restricted stock units solely to cover applicable withholding taxes required at the time of vesting.

What type of security was involved in Eric Duane Foster’s Ardelyx (ARDX) transactions?

All reported transactions involved Ardelyx common stock, linked to the vesting of restricted stock units. The sales were described as open-market transactions executed automatically to cover tax withholding obligations triggered by the RSU vesting event.

How many separate sale transactions did Ardelyx (ARDX) report for its CCO?

The filing lists four separate sale transactions for Eric Duane Foster on February 20, 2026. Each line reflects a portion of the total 10,439 shares sold, all categorized as open-market sales associated with RSU vesting tax withholding.