Automatic tax-related stock sales by Ardelyx (ARDX) officer Mike Kelliher

Rhea-AI Filing Summary

Ardelyx, Inc. officer Mike Kelliher reported automatic sales of company common stock tied to vested restricted stock units. On February 20, 2026, he sold a total of 9,595 shares in open-market transactions at prices around $5.71–$5.87 per share.

According to the footnote, these were “automatic sell-to-cover” transactions required under the original RSU grant terms and were executed solely to cover withholding taxes, rather than discretionary sales. After these transactions, Kelliher directly holds 364,666 shares of Ardelyx common stock.

Insider Trade Summary

Net Seller: 9,595 shares ($56,099)

Net Sell 3 txns

Insider Kelliher Mike

Role See Remarks

Sold 9,595 shs ($56K)

Type	Security	Shares	Price	Value
Sale	Common Stock	8,434	$5.865	$49K
Sale	Common Stock	1,159	$5.7138	$7K
Sale	Common Stock	2	$5.705	$11.41

Holdings After Transaction: Common Stock — 365,827 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^*

Kelliher Mike

(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)
	See Remarks

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)		8,434	D	$5.865	365,827	D
Common Stock	02/20/2026		S(1)		1,159	D	$5.7138	364,668	D
Common Stock	02/20/2026		S(1)		2	D	$5.705	364,666	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.

Remarks:

Chief Business Officer

	/s/ Elizabeth Grammer, Attorney-in-Fact for Mike Kelliher	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 Mike Kelliher?

Ardelyx officer Mike Kelliher reported automatic open-market sales of 9,595 common shares on February 20, 2026. These sales were triggered by RSU vesting and executed solely to cover related tax withholding obligations under the original award terms.

At what prices were Mike Kelliher’s Ardelyx (ARDX) shares sold?

The reported shares were sold at prices ranging from about $5.71 to $5.87 per share. Each transaction was an open-market sale executed on February 20, 2026, tied to the vesting of restricted stock units and associated tax obligations.

How many Ardelyx (ARDX) shares did Mike Kelliher sell in this Form 4?

Mike Kelliher sold a total of 9,595 shares of Ardelyx common stock across three open-market transactions. The reported trades involved 8,434, 1,159, and 2 shares, all executed on February 20, 2026, to cover RSU-related withholding taxes.

Were Mike Kelliher’s Ardelyx (ARDX) stock sales discretionary or automatic?

The filing notes these sales were automatic sell-to-cover transactions. They occurred under the original restricted stock unit grant terms and were executed solely to satisfy tax withholding upon RSU vesting, rather than representing discretionary open-market selling activity.

How many Ardelyx (ARDX) shares does Mike Kelliher own after the reported sales?

After the reported sell-to-cover transactions, Mike Kelliher directly owns 364,666 shares of Ardelyx common stock. This remaining stake reflects his holdings following the automatic sales tied to restricted stock unit vesting and the associated tax withholding requirements.

What type of security was involved in Mike Kelliher’s Ardelyx (ARDX) Form 4?

All reported transactions involved Ardelyx common stock. The sales were linked to the vesting of restricted stock units, where a portion of the resulting shares was automatically sold in the market to cover required withholding taxes under the award’s terms.