Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
226 institutional managers reported holding ARDX for the quarter ended Mar 31, 2026. Together they hold about 69% of shares outstanding; the top 10 hold 44%. 40 opened new positions; 38 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 21.16M | 8.61% | $126.8M | unchanged | 2014 Q3 |
| Vanguard Group | 19.06M | 7.75% | $114.1M | unchanged | 2014 Q3 |
| Millennium Management | 17.84M | 7.26% | $106.9M | added +49.8% | 2019 Q3 |
| State Street | 13.60M | 5.53% | $81.5M | added +14.2% | 2014 Q3 |
| Janus Henderson | 8.37M | 3.40% | $50.1M | trimmed -42.3% | 2022 Q3 |
| Nomura Asset Management International INC. | 8.17M | 3.32% | $48.9M | trimmed -12.4% | 2025 Q3 |
| Geode Capital | 6.01M | 2.44% | $36.0M | added +3.1% | 2014 Q3 |
| Nuveen | 5.23M | 2.13% | $31.4M | added +1.4% | 2023 Q2 |
| Two Sigma | 4.27M | 1.74% | $25.6M | added +48.7% | 2022 Q4 |
| Citadel Advisors | 3.46M | 1.41% | $20.8M | added +161% | 2016 Q3 |
| Goldman Sachs | 3.22M | 1.31% | $19.3M | added +4.9% | 2016 Q1 |
| J. Goldman & CO LP | 3.00M | 1.22% | $18.0M | added +84.9% | 2025 Q2 |
| Point72 | 2.98M | 1.21% | $17.9M | added +211.3% | 2025 Q3 |
| AQR Capital | 2.44M | 0.99% | $14.6M | added +20.5% | 2023 Q2 |
| Qube Research & Technologies LTD | 2.44M | 0.99% | $14.6M | added +122.2% | 2025 Q4 |
| Bank OF America CORP /DE/ | 2.34M | 0.95% | $14.0M | added +5.8% | 2014 Q4 |
| Rock Springs Capital Management LP | 2.30M | 0.94% | $13.8M | unchanged | 2024 Q4 |
| Eversept Partners, LP | 2.23M | 0.91% | $13.4M | added +30% | 2025 Q3 |
| Charles Schwab Investment Management | 2.11M | 0.86% | $12.7M | unchanged | 2015 Q2 |
| Northern Trust | 2.07M | 0.84% | $12.4M | added +2.6% | 2014 Q4 |
| Freestone Grove Partners LP | 1.88M | 0.77% | $11.3M | added +168.9% | 2024 Q4 |
| Rubric Capital Management LP | 1.86M | 0.76% | $11.1M | opened | 2026 Q1 |
| Jones Financial Companies Lllp | 1.86M | 0.76% | $11.1M | unchanged | 2024 Q2 |
| Morgan Stanley | 1.71M | 0.69% | $10.2M | trimmed -27.5% | 2014 Q3 |
| Marshall Wace | 1.60M | 0.65% | $9.6M | trimmed -69.1% | 2024 Q4 |
| First Trust Advisors LP | 1.50M | 0.61% | $9.0M | added +44.6% | 2024 Q2 |
| Renaissance Technologies | 1.27M | 0.52% | $7.6M | trimmed -29.1% | 2025 Q1 |
| Jane Street | 1.18M | 0.48% | $7.1M | trimmed -42.8% | 2020 Q2 |
| UBS | 1.13M | 0.46% | $6.8M | added +11.9% | 2014 Q3 |
| Hennion & Walsh Asset Management, INC. | 1.00M | 0.41% | $6.0M | added +4.4% | 2023 Q2 |
| Trexquant Investment LP | 804.7k | 0.33% | $4.8M | added +146% | 2024 Q1 |
| Redmile Group, LLC (focused) | 733.4k | 0.30% | $4.4M | opened | 2026 Q1 |
| Deutsche Bank AG\ | 708.6k | 0.29% | $4.2M | added +41.7% | 2014 Q3 |
| BNP Paribas Financial Markets | 702.7k | 0.29% | $4.2M | trimmed -30% | 2015 Q1 |
| Susquehanna International Group | 702.0k | 0.29% | $4.2M | trimmed -9.6% | 2019 Q2 |
| BNY Mellon | 700.8k | 0.28% | $4.2M | trimmed -3.1% | 2014 Q4 |
| Squarepoint Ops LLC | 697.3k | 0.28% | $4.2M | added +101.4% | 2023 Q1 |
| Sector Gamma AS (focused) | 516.1k | 0.21% | $3.1M | opened | 2026 Q1 |
| Krensavage Asset Management, LLC (focused) | 500.0k | 0.20% | $3.0M | opened | 2026 Q1 |
| Raymond James Financial INC | 486.7k | 0.20% | $2.9M | added +151.2% | 2021 Q4 |
| Swiss National Bank | 480.8k | 0.20% | $2.9M | added +1.2% | 2023 Q1 |
| GSA Capital Partners LLP | 473.1k | 0.19% | $2.8M | added +673.6% | 2024 Q4 |
| Ishara Investments LP (focused) | 451.0k | 0.18% | $2.7M | opened | 2026 Q1 |
| Y-Intercept (Hong Kong) LTD | 450.7k | 0.18% | $2.7M | trimmed -9.8% | 2025 Q2 |
| Monimus Capital Management, LP | 443.8k | 0.18% | $2.7M | added +127.9% | 2025 Q1 |
| Schroder Investment Management Group | 419.8k | 0.17% | $2.5M | added +13.9% | 2025 Q4 |
| Rafferty Asset Management, LLC | 407.9k | 0.17% | $2.4M | added +4.5% | 2023 Q1 |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 357.2k | 0.14% | $2.1M | added +2.8% | 2025 Q1 |
| Clay Northam Wealth Management, LLC | 332.0k | 0.14% | $2.0M | added +5.4% | 2023 Q4 |
| HRT Financial LP | 325.1k | 0.13% | $1.9M | opened | 2025 Q1 |
Largest 50 of 226 shown; the full ranked, searchable register is at boothcheck.com/holders/ARDX. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.