Ardelyx (ARDX) Chief Patient Officer sells 6,989 shares to cover RSU taxes

Rhea-AI Filing Summary

Ardelyx, Inc. Chief Patient Officer Laura A. Williams reported multiple open-market sales totaling 6,989 shares of common stock at $6.2675 per share. According to the footnote, these transactions were automatic sell-to-cover trades tied to RSU vesting, executed solely to pay withholding taxes. Williams continued to hold 434,579 shares directly after the transactions.

Insider Trade Summary

Net Seller: 6,989 shares ($43,804)

Net Sell 4 txns

Insider Williams Laura A

Role Chief Patient Officer

Sold 6,989 shs ($44K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,503	$6.2675	$9K
Sale	Common Stock	2,157	$6.2675	$14K
Sale	Common Stock	1,911	$6.2675	$12K
Sale	Common Stock	1,418	$6.2675	$9K

Holdings After Transaction: Common Stock — 434,579 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold: 6,989 shares Sale price: $6.2675 per share Shares held after: 434,579 shares +1 more

4 metrics

Shares sold 6,989 shares Total common shares sold on 2026-05-21

Sale price $6.2675 per share Execution price for all reported sales

Shares held after 434,579 shares Direct ownership following the transactions

Number of sale transactions 4 transactions Open-market sales of common stock

Key Terms

sell-to-cover, restricted stock units ("RSUs"), withholding taxes, open-market sale

4 terms

sell-to-cover financial

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

Sell-to-cover is when part of newly issued or exercised company stock is immediately sold to pay required taxes and fees, so the recipient keeps the remaining shares. For investors this matters because it reduces the number of shares insiders or employees actually hold after a grant, can create small, routine share sales that aren’t signal of cashing out, and slightly increases share supply on the market—like selling a portion of a paycheck to cover the tax bill.

restricted stock units ("RSUs") financial

"the initial grant of the restricted stock units ("RSUs") awards"

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.

withholding taxes financial

"the shares were 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.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

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^*

Williams Laura A

(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)
	Chief Patient Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/21/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/21/2026		S(1)		1,503	D	$6.2675	434,579	D
Common Stock	05/21/2026		S(1)		2,157	D	$6.2675	432,422	D
Common Stock	05/21/2026		S(1)		1,911	D	$6.2675	430,511	D
Common Stock	05/21/2026		S(1)		1,418	D	$6.2675	429,093	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:

	/s/ Michael Raab, Attorney-in-Fact for Laura A. Williams	05/22/2026
	** 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)

FAQ

What did Ardelyx (ARDX) executive Laura A. Williams report in this Form 4?

Laura A. Williams reported selling 6,989 Ardelyx common shares in several open-market transactions at $6.2675 per share. The filing notes these sales were automatically executed to cover withholding taxes upon vesting of restricted stock units, rather than discretionary sales for portfolio reasons.

Why did Laura A. Williams sell Ardelyx (ARDX) shares in this filing?

The shares were sold under an automatic sell-to-cover arrangement linked to her restricted stock unit grants. The footnote explains the sales occurred upon RSU vesting solely to satisfy applicable withholding taxes, indicating a tax-related mechanism instead of a voluntary decision to reduce her investment.

How many Ardelyx (ARDX) shares did Laura A. Williams sell and at what price?

She sold a total of 6,989 shares of Ardelyx common stock across four transactions. Each sale was executed at a price of $6.2675 per share, as disclosed in the Form 4, reflecting a uniform execution price for the tax-related sell-to-cover activity.

How many Ardelyx (ARDX) shares does Laura A. Williams hold after these transactions?

After the reported sales, Laura A. Williams directly holds 434,579 Ardelyx common shares. This post-transaction ownership figure in the Form 4 shows that the tax-related sales represented a small portion of her overall direct equity position in the company.

Are the Ardelyx (ARDX) share sales by Laura A. Williams part of a trading plan?

The footnote states the transactions were pursuant to an automatic sell-to-cover imposed by the terms of the initial RSU grants. This means the sales were pre-arranged within the award documents, automatically triggered at vesting to fund withholding tax obligations.