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

Reporting relationship: Chief Commercial Officer
Issuer ticker: ARDX
Reported as of: 21 May 2026
Net transaction value: -$50,127
SEC form: 4
Accepted by SEC: 22 May 2026, 16:12:20 UTC
Prior SEC filing: 23 Feb 2026
Source filing: View source filing
Reporting owner signature: /s/ Michael Raab, Attorney-in-Fact for Eric D. Foster

Key filing fact

Eric D. Foster filed Form 4 for ARDELYX, INC. (ARDX) on 22 May 2026.

Key facts

This page summarizes Eric D. Foster's Form 4 filing for ARDELYX, INC. (ARDX).
3 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 22 May 2026, 16:12.

Change

Previous filing in this sequence was filed on 23 Feb 2026.
Current net transaction value: -$50,127.

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/ Michael Raab, Attorney-in-Fact for Eric D. Foster
Signature date: 22 May 2026

Reported non-derivative transactions

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

ARDX transaction

Common Stock

Sale

Transaction value: $19,843
Shares: -3,166
Change %: -0.74%
Price: $6.27
Shares after: 422,804
Date: 21 May 2026
Ownership: Direct
Footnotes: F1

ARDX transaction

Common Stock

Sale

Transaction value: $15,211
Shares: -2,427
Change %: -0.57%
Price: $6.27
Shares after: 420,377
Date: 21 May 2026
Ownership: Direct
Footnotes: F1

ARDX transaction

Common Stock

Sale

Transaction value: $15,073
Shares: -2,405
Change %: -0.57%
Price: $6.27
Shares after: 417,972
Date: 21 May 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.