Eric Duane Foster - 21 Aug 2026 Form 4 Insider Report for ARDELYX, INC. (ARDX)

Reporting relationship: Chief Commercial Officer
Issuer ticker: ARDX
Reported as of: 21 Aug 2026
Net transaction value: -$33,023
SEC form: 4
Accepted by SEC: 25 Aug 2026, 19:13:16 UTC
Prior SEC filing: 22 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Felecia Ettenberg, Attorney-in-Fact for Eric Duane Foster

Key filing fact

Eric Duane Foster filed Form 4 for ARDELYX, INC. (ARDX) on 25 Aug 2026.

Key facts

This page summarizes Eric Duane Foster's Form 4 filing for ARDELYX, INC. (ARDX).
3 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 25 Aug 2026, 19:13.

Change

Previous filing in this sequence was filed on 22 May 2026.
Current net transaction value: -$33,023.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002034148 Primary reporting owner

Foster Eric Duane

Relationship: Chief Commercial Officer
Address: C/O ARDELYX, INC., 400 FIFTH AVENUE, SUITE 210, WALTHAM
Signature: /s/ Felecia Ettenberg, Attorney-in-Fact for Eric Duane Foster
Signature date: 25 Aug 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ARDX transaction

Common Stock

Sale

Transaction value: $10,020
Shares: -2,598
Change %: -0.62%
Price: $3.86
Shares after: 415,374
Date: 21 Aug 2026
Ownership: Direct
Footnotes: F1

ARDX transaction

Common Stock

Sale

Transaction value: $13,071
Shares: -3,389
Change %: -0.82%
Price: $3.86
Shares after: 411,985
Date: 21 Aug 2026
Ownership: Direct
Footnotes: F1

ARDX transaction

Common Stock

Sale

Transaction value: $9,932
Shares: -2,575
Change %: -0.63%
Price: $3.86
Shares after: 409,410
Date: 21 Aug 2026
Ownership: Direct
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote 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.