Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in ARDX held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 21.2M | $126.8M | +0.1% | 8.630% | 0.00% |
| 2 | STATE STREET CORP | 13.6M | $81.5M | +14.2% | 5.547% | 0.00% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 10.4M | $62.1M | β | 4.227% | 0.00% |
| 4 | JANUS HENDERSON GROUP PLC | 8.4M | $50.1M | -42.3% | 3.413% | 0.02% |
| 5 | NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 8.2M | $48.9M | -12.4% | 3.331% | 0.08% |
| 6 | VANGUARD PORTFOLIO MANAGEMENT LLC | 6.7M | $39.9M | β | 2.716% | 0.00% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 6.0M | $36.0M | +3.1% | 2.450% | 0.00% |
| 8 | Nuveen, LLC | 5.2M | $31.4M | +1.4% | 2.135% | 0.01% |
| 9 | TWO SIGMA INVESTMENTS, LP | 4.3M | $25.6M | +48.7% | 1.743% | 0.02% |
| 10 | CITADEL ADVISORS LLC | 3.8M | $22.5M | +111.5% | 1.535% | 0.01% |
| 11 | GOLDMAN SACHS GROUP INC | 3.2M | $19.3M | +4.9% | 1.311% | 0.00% |
| 12 | J. Goldman & Co LP | 3.0M | $18.0M | +84.9% | 1.224% | 0.56% |
| 13 | Point72 Asset Management, L.P. | 3.0M | $17.9M | +211.3% | 1.217% | 0.03% |
| 14 | AQR CAPITAL MANAGEMENT LLC | 2.4M | $14.6M | +20.5% | 0.995% | 0.01% |
| 15 | Qube Research & Technologies Ltd | 2.4M | $14.6M | +122.2% | 0.993% | 0.02% |
| 16 | BANK OF AMERICA CORP /DE/ | 2.3M | $14.0M | +5.8% | 0.953% | 0.00% |
| 17 | Rock Springs Capital Management LP | 2.3M | $13.8M | 0.0% | 0.938% | 0.81% |
| 18 | Eversept Partners, LP | 2.2M | $13.4M | +30.0% | 0.909% | 0.87% |
| 19 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 2.1M | $12.7M | -0.1% | 0.862% | 0.00% |
| 20 | NORTHERN TRUST CORP | 2.1M | $12.4M | +2.6% | 0.844% | 0.00% |
| 21 | Freestone Grove Partners LP | 1.9M | $11.3M | +168.9% | 0.766% | 0.08% |
| 22 | Rubric Capital Management LP | 1.9M | $11.1M | β | 0.759% | 0.14% |
| 23 | MORGAN STANLEY | 1.7M | $10.2M | -27.6% | 0.697% | 0.00% |
| 24 | JONES FINANCIAL COMPANIES LLLP | 1.9M | $10.2M | +0.2% | 0.758% | 0.00% |
| 25 | VANGUARD FIDUCIARY TRUST CO | 1.7M | $10.1M | β | 0.684% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in ARDX β a direct measure of their conviction.
Filings activity in ARDX during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 230 | +3.6% | 63.42% | 4.80 pp | $885M | 7.0% |
| Q4 2025 | 222 | +2.8% | 68.22% | +2.44 pp | $952M | +3.7% |
| Q3 2025 | 216 | +6.9% | 65.78% | +19.44 pp | $918M | +42% |
| Q2 2025 | 202 | 5.2% | 46.34% | 7.66 pp | $647M | 14% |
| Q1 2025 | 213 | +2.4% | 54.00% | +0.20 pp | $754M | +0.4% |
| Q4 2024 | 208 | +6.1% | 53.80% | 13.32 pp | $751M | 20% |
| Q3 2024 | 196 | +2.6% | 67.12% | 7.21 pp | $937M | 9.7% |
| Q2 2024 | 191 | β | 74.33% | β | $1.04B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ARDX stock.
Based on Q1 2026 13F filings, institutional ownership of Ardelyx, Inc. stands at 63.4%, held across 230 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of ARDX, with approximately 21,164,132 shares worth $0.13B as of Q1 2026.
Yes β 3 widely-followed marquee investors appear among the top 25 institutional holders of ARDX, including TWO SIGMA INVESTMENTS, LP, CITADEL ADVISORS LLC, Point72 Asset Management, L.P..
Our composite Smart Money Score for ARDX is 52 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
49 institutions opened new positions in ARDX during Q1 2026, while 41 fully exited. 132 added to existing positions and 46 trimmed.
ARDX institutional ownership fell by 4.80 percentage points quarter-over-quarter, with a net change of +8 holders.
The top 10 institutions account for 59.3% of all reported 13F value in ARDX, and the top 25 account for 82.3%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Ardelyx, Inc. (ARDX) Institutional Ownership