Ardelyx, Inc.
Ardelyx, Inc. (ARDX) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ARDX · as of Sep 30, 2025
Ownership Breakdown
235
Institutional Holders
▲ 22 vs Q2
$963.28M
Total Inst. Value
▲ $306.23M vs Q2
247.03M
Shares Outstanding
freeFloat 95.67%
162.78M
13F Shares Held
▼ 4.93M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ARDX largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. pharmaceutical preparations | 20.82M | 8.68% | 8.68% | $114.74B | Nov 12, 2025 | ▲ 75.7K |
VANGUARD GROUP INC pharmaceutical preparations | 18.37M | 7.66% | 7.66% | $101.21B | Nov 7, 2025 | ▲ 2.34M |
JANUS HENDERSON GROUP PLC pharmaceutical preparations | 13.82M | 5.76% | 5.76% | $76.14B | Nov 14, 2025 | ▼ 1.23M |
MACQUARIE GROUP LTD pharmaceutical preparations | 10.46M | 4.36% | 4.36% | $57.61B | Nov 13, 2025 | ▼ 1.00M |
STATE STREET CORP pharmaceutical preparations | 9.72M | 4.05% | 4.05% | $53.55B | Nov 14, 2025 | ▼ 123.2K |
MARSHALL WACE, LLP pharmaceutical preparations | 8.94M | 3.73% | 3.73% | $49.28B | Nov 13, 2025 | ▼ 2.31M |
MILLENNIUM MANAGEMENT LLC pharmaceutical preparations | 7.64M | 3.19% | 3.19% | $42.11B | Nov 14, 2025 | ▼ 4.02M |
GEODE CAPITAL MANAGEMENT, LLC pharmaceutical preparations | 5.76M | 2.40% | 2.40% | $31.72B | Nov 12, 2025 | ▲ 90.7K |
NUVEEN, LLC pharmaceutical preparations | 5.17M | 2.16% | 2.16% | $28.51B | Nov 12, 2025 | ▲ 1.69M |
D. E. SHAW & CO., INC. pharmaceutical preparations | 3.31M | 1.38% | 1.38% | $18.25B | Nov 14, 2025 | ▲ 854.4K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
26
Increased
+14.45M shares3
New Positions
first time holders20
Decreased
−15.65M shares0
Sold Out
fully exitedNet shares change (top 50)
1.20M
+14.45M / −15.65M
Net new holders
+9
3 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ARDX insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
2
Buy transactions
23
Sell transactions
0.09
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Reilly Joseph James See Remarks | May 21, 2026 | Sale | 1,036 | $6.27 | $6.5K | 149.8K | Form 4 ↗ |
Reilly Joseph James See Remarks | May 21, 2026 | Sale | 2,683 | $6.27 | $16.8K | 149.1K | Form 4 ↗ |
Hohenleitner Susan Chief Financial Officer | May 21, 2026 | Sale | 1,455 | $6.27 | $9.1K | 229.1K | Form 4 ↗ |
Bishop John E See Remarks | May 21, 2026 | Sale | 2,306 | $6.27 | $14.5K | 336.8K | Form 4 ↗ |
Brady James Parker Chief Human Resources Officer | May 21, 2026 | Sale | 1,846 | $6.27 | $11.6K | 261.1K | Form 4 ↗ |
Foster Eric Duane Chief Commercial Officer | May 21, 2026 | Sale | 3,166 | $6.27 | $19.8K | 422.8K | Form 4 ↗ |
Foster Eric Duane Chief Commercial Officer | May 21, 2026 | Sale | 2,427 | $6.27 | $15.2K | 420.4K | Form 4 ↗ |
Foster Eric Duane Chief Commercial Officer | May 21, 2026 | Sale | 2,405 | $6.27 | $15.1K | 418.0K | Form 4 ↗ |
Kelliher Mike Chief Business Officer | May 21, 2026 | Sale | 2,900 | $6.27 | $18.2K | 361.8K | Form 4 ↗ |
Kelliher Mike Chief Business Officer | May 21, 2026 | Sale | 1,870 | $6.27 | $11.7K | 359.9K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Ardelyx, Inc. (ARDX) is primarily owned by institutional investors, who hold approximately 65.9% of total shares outstanding. Company insiders own approximately 4.33%, while retail and public investors account for the remaining 29.78%.
The largest institutional shareholder of Ardelyx, Inc. is BLACKROCK, INC., holding approximately 20.82 million shares — equal to 8.68% of outstanding shares — as of September 30, 2025.
A total of 235 institutional investors currently hold ARDX stock, with a combined institutional value of approximately $963,279,964 as of the most recent 13F filing period.
Frequently asked questions
ARDX ownershipArdelyx, Inc. (ARDX) is primarily owned by institutional investors, who hold approximately 65.9% of shares. The largest shareholder is BLACKROCK, INC. with a 8.68% stake. Company insiders hold 4.33%. Data sourced from SEC Form 13F as of September 30, 2025.