Ardelyx (ARDX) officer’s RSU vesting triggers 2,306-share tax sell

Rhea-AI Filing Summary

ARDELYX, INC. officer John E. Bishop reported a small sale of common stock tied to restricted stock unit (RSU) vesting. He disposed of 2,306 shares at an average price of $6.2675 per share, and held 336,845 shares afterward.

According to the footnote, the transaction was an automatic sell-to-cover required by the original RSU grant terms, with shares sold solely to pay applicable withholding taxes. This indicates a routine, compensation-related tax event rather than a discretionary open-market sale based on a view of the stock.

Insider Trade Summary

Net Seller: 2,306 shares ($14,453)

Net Sell 1 txn

Insider Bishop John E

Role See Remarks

Sold 2,306 shs ($14K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,306	$6.2675	$14K

Holdings After Transaction: Common Stock — 336,845 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold: 2,306 shares Sale price: $6.2675 per share Post-transaction holdings: 336,845 shares +1 more

4 metrics

Shares sold 2,306 shares Open-market sale associated with RSU vesting

Sale price $6.2675 per share Average price for the 2,306 shares sold

Post-transaction holdings 336,845 shares Common stock held directly after reported sale

Net shares sold 2,306 shares Net change in position from this Form 4

Key Terms

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

4 terms

restricted stock units ("RSUs") financial

"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.

sell-to-cover financial

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

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.

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.

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^*

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)
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)		2,306	D	$6.2675	336,845	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 Technical and Quality Officer

	/s/ Michael Raab, Attorney-in-Fact for John Bishop	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 insider transaction did ARDELYX (ARDX) report for John E. Bishop?

ARDELYX officer John E. Bishop reported selling 2,306 shares of common stock. The shares were sold automatically when restricted stock units vested, and the sale served only to cover required tax withholding obligations tied to that compensation award.

At what price were John E. Bishop’s ARDELYX (ARDX) shares sold?

The reported shares were sold at an average price of $6.2675 per share. This price applies to the 2,306 ARDELYX common shares disposed of in the transaction linked to the vesting of Bishop’s restricted stock units and related tax withholding.

How many ARDELYX (ARDX) shares does John E. Bishop hold after this filing?

After the transaction, John E. Bishop held 336,845 ARDELYX common shares directly. This post-transaction balance shows that the tax-related sale represented a small portion of his overall reported holdings in the company’s stock.

Was the ARDELYX (ARDX) insider sale a discretionary trade or tax-related?

The sale was tax-related, not discretionary. The footnote states it was an automatic sell-to-cover imposed by the original RSU grant, with shares sold solely to cover applicable withholding taxes upon vesting of those restricted stock units.

What role do restricted stock units (RSUs) play in this ARDELYX (ARDX) Form 4?

The Form 4 explains that the sold shares came from vesting restricted stock units. When the RSUs vested, an automatic sell-to-cover provision triggered, selling enough shares to pay withholding taxes associated with this stock-based compensation.

Does this ARDELYX (ARDX) Form 4 indicate any remaining derivative or option holdings?

The filing’s derivative summary is empty, indicating no additional derivative transactions were reported in this Form 4. The disclosed position after the sale consists of 336,845 shares of ARDELYX common stock held directly by John E. Bishop.