Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
286 institutional managers reported holding ADPT for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 53%. 48 opened new positions; 40 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Viking Global | 29.99M | 19.29% | $416.5M | unchanged | 2019 Q2 |
| BlackRock | 13.30M | 8.55% | $184.7M | unchanged | 2019 Q3 |
| Vanguard Group | 11.66M | 7.50% | $161.9M | added +3.1% | 2019 Q2 |
| Westfield Capital Management CO LP | 5.44M | 3.50% | $75.5M | added +33.9% | 2025 Q4 |
| Invesco | 4.45M | 2.86% | $61.8M | added +43.2% | 2019 Q2 |
| Wellington Management | 3.86M | 2.48% | $53.6M | added +78.1% | 2025 Q3 |
| Geode Capital | 3.64M | 2.34% | $50.5M | added +3.5% | 2019 Q3 |
| Lord, Abbett & CO. LLC | 3.54M | 2.27% | $49.1M | added +14.8% | 2025 Q1 |
| Goldman Sachs | 3.24M | 2.08% | $45.0M | added +11.7% | 2019 Q2 |
| State Street | 3.23M | 2.08% | $44.8M | added +1.4% | 2019 Q3 |
| Ameriprise Financial INC | 3.02M | 1.94% | $41.9M | added +16.5% | 2022 Q4 |
| BNP Paribas Financial Markets | 2.77M | 1.78% | $38.5M | added +3910.1% | 2019 Q3 |
| ARK Investment Management | 2.09M | 1.35% | $29.1M | trimmed -2.2% | 2020 Q2 |
| Fred Alger Management, LLC | 2.06M | 1.33% | $28.6M | trimmed -8.1% | 2025 Q2 |
| Arrowstreet Capital | 2.00M | 1.28% | $27.7M | trimmed -17.6% | 2025 Q1 |
| D. E. Shaw | 1.97M | 1.26% | $27.3M | added +3.3% | 2025 Q2 |
| Nomura Asset Management International INC. | 1.88M | 1.21% | $26.1M | trimmed -3.1% | 2025 Q4 |
| Driehaus Capital Management LLC | 1.75M | 1.13% | $24.3M | trimmed -36.6% | 2024 Q3 |
| Aristotle Atlantic Partners, LLC | 1.71M | 1.10% | $23.8M | trimmed -7% | 2019 Q3 |
| Principal Financial Group INC | 1.70M | 1.10% | $23.7M | added +9.8% | 2019 Q2 |
| Sumitomo Mitsui Trust Group, INC. | 1.60M | 1.03% | $22.2M | trimmed -18.1% | 2020 Q1 |
| Amova Asset Management Americas, INC. | 1.60M | 1.03% | $22.2M | trimmed -18.1% | 2020 Q2 |
| T. Rowe Price | 1.57M | 1.01% | $21.7M | trimmed -64.3% | 2019 Q2 |
| Northern Trust | 1.39M | 0.90% | $19.3M | added +18.7% | 2019 Q3 |
| Divisadero Street Capital Management, LP | 1.32M | 0.85% | $18.3M | added +264.9% | 2025 Q4 |
| Nuveen | 1.30M | 0.84% | $18.1M | added +65.8% | 2019 Q2 |
| Capricorn Fund Managers LTD | 1.29M | 0.83% | $17.9M | opened | 2026 Q1 |
| Bank OF America CORP /DE/ | 1.23M | 0.79% | $17.0M | added +52.3% | 2019 Q3 |
| Charles Schwab Investment Management | 1.15M | 0.74% | $15.9M | trimmed -2.4% | 2019 Q3 |
| Millennium Management | 1.08M | 0.69% | $15.0M | added +5790.8% | 2024 Q1 |
| MFS Investment Management | 1.07M | 0.69% | $14.9M | added +16.2% | 2019 Q2 |
| Aberdeen Group plc | 1.07M | 0.69% | $14.9M | added +2.3% | 2023 Q4 |
| Point72 | 1.02M | 0.66% | $14.2M | added +403.2% | 2023 Q3 |
| Blue Water Life Science Advisors, LP (focused) | 1.01M | 0.65% | $14.0M | trimmed -42.8% | 2022 Q2 |
| Morgan Stanley | 967.1k | 0.62% | $13.4M | trimmed -15.8% | 2019 Q2 |
| Kennedy Capital Management LLC | 931.5k | 0.60% | $12.9M | added +3.5% | 2025 Q1 |
| T. Rowe Price Investment Management, INC. | 919.3k | 0.59% | $12.8M | added +29288.7% | 2025 Q4 |
| Oberweis Asset Management INC/ | 807.0k | 0.52% | $11.2M | added +8.4% | 2025 Q2 |
| Tudor Investment | 786.3k | 0.51% | $10.9M | added +41.9% | 2024 Q1 |
| Deutsche Bank AG\ | 785.8k | 0.51% | $10.9M | trimmed -54.7% | 2019 Q3 |
| Jennison Associates LLC | 753.1k | 0.48% | $10.5M | trimmed -71.8% | 2022 Q3 |
| Catalio Capital Management, LP (focused) | 722.8k | 0.47% | $10.0M | trimmed -12% | 2025 Q1 |
| Rhenman & Partners Asset Management AB | 720.0k | 0.46% | $10.0M | added +19% | 2025 Q3 |
| Jane Street | 682.2k | 0.44% | $9.5M | opened | 2020 Q1 |
| Connor, Clark & Lunn Investment Management LTD. | 649.6k | 0.42% | $9.0M | added +9.9% | 2025 Q3 |
| Qube Research & Technologies LTD | 639.4k | 0.41% | $8.9M | trimmed -30.1% | 2025 Q2 |
| Hillsdale Investment Management INC. | 625.2k | 0.40% | $8.7M | added +1.3% | 2025 Q2 |
| Trexquant Investment LP | 571.6k | 0.37% | $7.9M | added +116.5% | 2024 Q4 |
| FMR (Fidelity) | 567.0k | 0.36% | $7.9M | added +46.9% | 2019 Q2 |
| SEI Investments CO | 560.6k | 0.36% | $7.8M | added +77.1% | 2019 Q2 |
Largest 50 of 286 shown; the full ranked, searchable register is at boothcheck.com/holders/ADPT. 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.