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

Q: Why were Eric Duane Foster’s ARDX shares sold in this Form 4?

The shares were sold under an automatic sell-to-cover provision tied to the initial restricted stock unit grants. The sales occurred upon RSU vesting and were made solely to cover applicable withholding taxes, according to the footnote.

Q: How many ARDX shares did Eric Duane Foster sell and at what prices?

Eric Duane Foster sold a total of 8,562 ARDX shares at a weighted average price of $3.8569 per share. The transactions were executed in multiple trades at prices ranging from $3.648 to $3.984 per share.

Q: How many separate sale transactions did the ARDX Form 4 disclose?

The Form 4 for ARDX discloses three separate open-market or private sale transactions of common stock by Eric Duane Foster, all dated 2026-08-21, which together total 8,562 shares.

Filing Impact

(Neutral)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

ARDELYX, INC. (ARDX) reported that Chief Commercial Officer Eric Duane Foster sold a total of 8,562 shares of common stock on 2026-08-21 at a weighted average price of $3.8569 per share. According to the footnote, these sales were an automatic sell-to-cover triggered upon vesting of restricted stock units and were made solely to cover applicable withholding taxes, executed in multiple trades between $3.648 and $3.984 per share.

Insider Trade Summary

Net Seller: 8,562 shares

Net Sell 3 txns

Insider Foster Eric Duane

Role Chief Commercial Officer

Sold 8,562 shs ($33K)

Type	Security	Shares	Price	Value
Sale	Common Stock ^F1	2,598	$3.8569	$10K
Sale	Common Stock ^F1	3,389	$3.8569	$13K
Sale	Common Stock ^F1	2,575	$3.8569	$10K

Holdings After Transaction: Common Stock — 409,410 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: 8,562 shares of Common Stock Weighted average sale price: $3.8569 per share Sale price range: $3.648 to $3.984 per share +1 more

4 metrics

Shares sold 8,562 shares of Common Stock Total non-derivative sales by Eric Duane Foster on 2026-08-21

Weighted average sale price $3.8569 per share Average price for the reported 8,562-share sale sequence

Sale price range $3.648 to $3.984 per share Range of prices for multiple trades on 2026-08-21

Number of sale transactions 3 transactions Non-derivative sales of Common Stock reported in this Form 4

Key Terms

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

3 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

"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 Eric Duane Foster?

ARDX reported that Chief Commercial Officer Eric Duane Foster sold 8,562 shares of common stock on 2026-08-21 in three open-market transactions at a weighted average price of $3.8569 per share.

Why were Eric Duane Foster’s ARDX shares sold in this Form 4?

The shares were sold under an automatic sell-to-cover provision tied to the initial restricted stock unit grants. The sales occurred upon RSU vesting and were made solely to cover applicable withholding taxes, according to the footnote.

How many ARDX shares did Eric Duane Foster sell and at what prices?

Eric Duane Foster sold a total of 8,562 ARDX shares at a weighted average price of $3.8569 per share. The transactions were executed in multiple trades at prices ranging from $3.648 to $3.984 per share.

Were the ARDX insider sales made under a Rule 10b5-1 plan?

The filing’s Rule 10b5-1 checkbox is not marked as a plan trade, but the footnote states the transactions were under an automatic sell-to-cover mechanism imposed by the RSU grant terms to pay withholding taxes upon vesting.

How many separate sale transactions did the ARDX Form 4 disclose?

The Form 4 for ARDX discloses three separate open-market or private sale transactions of common stock by Eric Duane Foster, all dated 2026-08-21, which together total 8,562 shares.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/25/2026 - 07:13 PM Accepted by SEC EDGAR 08/25/2026 - 07:13 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^*

Foster Eric Duane

(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 Commercial Officer

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⁾		2,598	D	$3.8569	415,374	D
Common Stock	08/21/2026		S⁽¹⁾		3,389	D	$3.8569	411,985	D
Common Stock	08/21/2026		S⁽¹⁾		2,575	D	$3.8569	409,410	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:

	/s/ Felecia Ettenberg, Attorney-in-Fact for Eric Duane Foster	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