STOCK TITAN

Tax-related Ardelyx (ARDX) insider sale covers RSU withholding needs

Filing Impact
(Neutral)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

ARDELYX, INC. officer Joseph James Reilly reported selling a total of 3,719 shares of common stock at an average price of $6.2675 per share. According to the footnotes, these sales were automatic sell-to-cover transactions triggered by the vesting of restricted stock units and were made solely to cover withholding taxes. After the sales, he directly holds 149,107 shares of Ardelyx common stock. The holdings include 1,765 shares acquired under the company’s employee stock purchase plan on February 27, 2026.

Positive

  • None.

Negative

  • None.
Insider Reilly Joseph James
Role See Remarks
Sold 3,719 shs ($23K)
Type Security Shares Price Value
Sale Common Stock 2,683 $6.2675 $17K
Sale Common Stock 1,036 $6.2675 $6K
Holdings After Transaction: Common Stock — 149,107 shares (Direct, null)
Footnotes (1)
  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. Includes 1,765 shares acquired under the Issuer's employee stock purchase plan on February 27, 2026.
Total shares sold 3,719 shares Open-market sales on May 21, 2026
Sale price $6.2675 per share Price for both reported sale transactions
Shares after transactions 149,107 shares Direct common stock holdings following sales
ESPP acquisition 1,765 shares Acquired under employee stock purchase plan on February 27, 2026
First sale tranche 1,036 shares Common stock sold on May 21, 2026
Second sale tranche 2,683 shares Common stock sold on May 21, 2026
automatic sell-to-cover financial
"Pursuant to an automatic sell-to-cover imposed by the terms of the initial grant"
restricted stock units ("RSUs") financial
"the terms of 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.
employee stock purchase plan financial
"Includes 1,765 shares acquired under the Issuer's employee stock purchase plan"
An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.
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.
SEC Form 4
FORM 4UNITED 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*
Reilly Joseph James

(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)
Director10% Owner
XOfficer (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)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock05/21/2026S(1)2,683D$6.2675149,107D
Common Stock05/21/2026S(1)1,036D$6.2675149,836(2)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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount 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.
2. Includes 1,765 shares acquired under the Issuer's employee stock purchase plan on February 27, 2026.
Remarks:
Senior Vice President and Chief Accounting Officer
/s/ Michael Raab, Attorney-in-Fact for Joseph J. Reilly05/22/2026
** Signature of Reporting PersonDate
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 Joseph James Reilly?

Ardelyx reported that officer Joseph James Reilly sold 3,719 shares of common stock at $6.2675 per share. Footnotes state these were automatic sell-to-cover transactions tied to RSU vesting, executed solely to satisfy tax withholding obligations.

How many Ardelyx (ARDX) shares does Joseph James Reilly hold after this Form 4?

Following the reported transactions, Joseph James Reilly directly holds 149,107 shares of Ardelyx common stock. This figure includes his existing holdings and 1,765 shares previously acquired under the company’s employee stock purchase plan on February 27, 2026.

At what price were the Ardelyx (ARDX) insider shares sold in this filing?

The reported Ardelyx insider sales occurred at an average price of $6.2675 per share. Two open-market sale transactions on May 21, 2026, covered 1,036 and 2,683 shares respectively, both executed at this same per-share price according to the Form 4 data.

Does the Ardelyx (ARDX) Form 4 involve any derivative or option exercises?

The Form 4 does not report any derivative or option exercises. All disclosed transactions involve non-derivative common stock sales. A derivative summary is present but contains no remaining derivative positions or option exercises associated with this specific reporting period.

What role do restricted stock units (RSUs) play in this Ardelyx (ARDX) insider sale?

The insider sale is directly linked to RSU vesting. Footnotes state that, under the initial RSU grant terms, an automatic sell-to-cover mechanism required selling shares upon vesting specifically to fund applicable tax withholding obligations on the restricted stock unit awards.