Ardelyx technical chief sells 19,750 shares at $3.86

Rhea-AI Filing Summary

ARDELYX, INC. (ARDX) reported that Chief Technical and Quality Officer John E. Bishop sold a total of 19,750 shares of common stock on 2026-08-21 at a weighted average price of $3.8569 per share. According to the company’s disclosure, these shares were sold pursuant to an automatic sell-to-cover feature triggered by the vesting of restricted stock units, and were disposed of solely to cover applicable withholding taxes.

Insider Trade Summary

Net Seller: 19,750 shares

Net Sell 2 txns

Insider Bishop John E

Role See Remarks

Sold 19,750 shs ($76K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	17,281	$3.8569	$67K
Sale	Common Stock F1	2,469	$3.8569	$10K

Holdings After Transaction: Common Stock — 317,095 shares (Direct)

Footnotes (1)

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 (block 1): 17,281 shares Shares sold (block 2): 2,469 shares Total shares sold: 19,750 shares +2 more

5 metrics

Shares sold (block 1) 17,281 shares Common Stock sale on 2026-08-21 to cover withholding taxes

Shares sold (block 2) 2,469 shares Common Stock sale on 2026-08-21 to cover withholding taxes

Total shares sold 19,750 shares Aggregate of two Common Stock sale transactions by John E. Bishop

Weighted average sale price $3.8569 per share Weighted average price for sales executed on 2026-08-21

Trade price range $3.648 to $3.984 per share Price range of multiple trades comprising the reported sales

Key Terms

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

4 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") awards financial

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

withholding taxes financial

"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.

weighted average sale price financial

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

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did ARDX report for John E. Bishop on this Form 4?

ARDX reported that Chief Technical and Quality Officer John E. Bishop sold a total of 19,750 shares of common stock on 2026-08-21. The disclosure states the sales were made automatically in connection with RSU vesting to cover withholding taxes.

How many ARDX shares did John E. Bishop sell and at what price?

John E. Bishop sold 19,750 shares of ARDX common stock at a weighted average price of $3.8569 per share. The trades occurred in multiple transactions within a price range from $3.648 to $3.984, according to the company’s disclosure.

Were the ARDX stock sales by John E. Bishop discretionary or automatic?

The ARDX stock sales were described as automatic sell-to-cover transactions. They were imposed by the terms of Bishop’s initial restricted stock unit (RSU) grants and executed upon RSU vesting solely to cover applicable withholding taxes.

Did ARDX indicate that John E. Bishop’s sales were related to tax withholding?

Yes. ARDX disclosed that the shares were sold solely to cover applicable withholding taxes arising from the vesting of RSU awards. The automatic sell-to-cover mechanism was specified as part of the original RSU grant terms.

What price range did the ARDX insider sales occur in for John E. Bishop?

The sales were executed in multiple trades at prices ranging from $3.648 to $3.984 per ARDX share. The reported $3.8569 price is a weighted average sale price across those trades, as stated in the disclosure footnote.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/25/2026 - 07:17 PM Accepted by SEC EDGAR 08/25/2026 - 07:16 PM Learn about SEC filing dates

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^*

Bishop John E

(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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/21/2026		S(1)		17,281	D	$3.8569	319,564	D
Common Stock	08/21/2026		S(1)		2,469	D	$3.8569	317,095	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. 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:

Chief Technical and Quality Officer

	/s/ Felecia Ettenberg, Attorney-in-Fact for John E. Bishop	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)