Ardelyx Inc
Ownership
Ownership Structure
Who owns Ardelyx Inc (ARDX)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 81.6% of the shares are freely tradable; institutional investors hold 70.7%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 8.20 | 21,164,132 | +0.1 | 03/31/2026 |
| Millennium Management LLC | 5.38 | 13,900,773 | -22.1 | 06/30/2026 |
| State Street Corp | 5.27 | 13,604,307 | +14.2 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.01 | 10,365,512 | +0.0 | 03/31/2026 |
| HHG PLC | 3.24 | 8,371,234 | -42.3 | 03/31/2026 |
| Delaware Management Holdings Inc | 3.16 | 8,169,369 | -12.4 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| State Street® SPDR® S&P® Biotech ETF | 3.03 | 7,827,086 | -1.1 | 08/31/2026 |
| Nomura US Small Cap Core Equity | 2.96 | 7,634,498 | +18.0 | 06/30/2026 |
| Nomura Small Cap Core I | 2.96 | 7,634,498 | +0.0 | 07/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 2.87 | 7,404,867 | +0.0 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Raab Michael | President & CEO | 1,619,792 | 5,507,293 $ | Aug 21, 2026 | direct |
| Foster Eric Duane | Chief Commercial Officer | 409,410 | 1,391,994 $ | Aug 21, 2026 | direct |
| Williams Laura A | Chief Patient Officer | 367,456 | 1,249,350 $ | Aug 21, 2026 | direct |
| Kelliher Mike | Chief Business Officer | 349,660 | 1,188,844 $ | Aug 21, 2026 | direct |
| Bishop John E | See Remarks | 317,095 | 1,078,123 $ | Aug 21, 2026 | direct |
| Brady James Parker | Chief Human Resources Officer | 245,930 | 836,162 $ | Aug 21, 2026 | direct |
| Hohenleitner Susan | Chief Financial Officer | 227,520 | 773,568 $ | Aug 21, 2026 | direct |
| Reilly Joseph James | See Remarks | 145,854 | 495,904 $ | Aug 21, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 21, 2026 | Hohenleitner Susan | Chief Financial Officer | Sell | 1,558 | 3.86 | 6,009 |
| Aug 21, 2026 | Brady James Parker | Chief Human Resources Officer | Sell | 13,160 | 3.86 | 50,757 |
| Aug 21, 2026 | Brady James Parker | Chief Human Resources Officer | Sell | 1,976 | 3.86 | 7,621 |
| Aug 21, 2026 | Reilly Joseph James | See Remarks | Sell | 1,110 | 3.86 | 4,281 |
| Aug 21, 2026 | Reilly Joseph James | See Remarks | Sell | 2,872 | 3.86 | 11,077 |
| Aug 21, 2026 | Foster Eric Duane | Chief Commercial Officer | Sell | 2,575 | 3.86 | 9,932 |
| Aug 21, 2026 | Foster Eric Duane | Chief Commercial Officer | Sell | 3,389 | 3.86 | 13,071 |
| Aug 21, 2026 | Foster Eric Duane | Chief Commercial Officer | Sell | 2,598 | 3.86 | 10,020 |
| Aug 21, 2026 | Kelliher Mike | Chief Business Officer | Sell | 2,002 | 3.86 | 7,722 |
| Aug 21, 2026 | Kelliher Mike | Chief Business Officer | Sell | 2,652 | 3.86 | 10,229 |
| Aug 21, 2026 | Kelliher Mike | Chief Business Officer | Sell | 3,104 | 3.86 | 11,972 |
| Aug 21, 2026 | Williams Laura A | Chief Patient Officer | Sell | 1,734 | 3.86 | 6,688 |
| Aug 21, 2026 | Williams Laura A | Chief Patient Officer | Sell | 2,430 | 3.86 | 9,372 |
| Aug 21, 2026 | Williams Laura A | Chief Patient Officer | Sell | 3,089 | 3.86 | 11,914 |
| Aug 21, 2026 | Williams Laura A | Chief Patient Officer | Sell | 3,486 | 3.86 | 13,445 |
| Aug 21, 2026 | Raab Michael | President & CEO | Sell | 19,178 | 3.86 | 73,968 |
| Aug 21, 2026 | Raab Michael | President & CEO | Sell | 8,411 | 3.86 | 32,440 |
| Aug 21, 2026 | Raab Michael | President & CEO | Sell | 15,976 | 3.86 | 61,618 |
| Aug 21, 2026 | Raab Michael | President & CEO | Sell | 15,009 | 3.86 | 57,888 |
| Aug 21, 2026 | Bishop John E | See Remarks | Sell | 2,469 | 3.86 | 9,523 |
| Aug 21, 2026 | Bishop John E | See Remarks | Sell | 17,281 | 3.86 | 66,651 |
| Jul 15, 2026 | Raab Michael | President & CEO | Sell | 41,668 | 5.06 | 210,923 |
| Jul 15, 2026 | Raab Michael | President & CEO | Other | 20,834 | 0.99 | 20,626 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 18, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.