Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
289 institutional managers reported holding BCRX for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 54%. 64 opened new positions; 45 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 24.41M | 10.08% | $232.4M | added +9.6% | ≤2013 |
| BlackRock | 22.65M | 9.35% | $215.6M | added +7.2% | ≤2013 |
| RA Capital Management, L.p. | 15.83M | 6.53% | $150.7M | unchanged | 2025 Q4 |
| Deerfield Management Company, L.p. | 15.04M | 6.21% | $143.2M | added +4.9% | 2023 Q1 |
| State Street | 12.21M | 5.04% | $116.2M | added +10.3% | ≤2013 |
| TCG Crossover Management, LLC (focused) | 11.02M | 4.55% | $104.9M | opened | 2026 Q1 |
| Janus Henderson | 8.91M | 3.68% | $84.8M | added +20.3% | 2021 Q3 |
| Perceptive Advisors LLC | 7.43M | 3.07% | $70.8M | added +135.1% | 2025 Q4 |
| Vestal Point Capital, LP | 7.03M | 2.90% | $66.9M | added +212.2% | 2025 Q4 |
| Two Sigma | 6.39M | 2.64% | $60.9M | added +41.6% | 2016 Q4 |
| Geode Capital | 5.78M | 2.39% | $55.1M | added +14.4% | ≤2013 |
| Kynam Capital Management, LP (focused) | 5.68M | 2.35% | $54.1M | trimmed -39.4% | 2022 Q2 |
| UBS | 5.31M | 2.19% | $50.6M | trimmed -5.8% | ≤2013 |
| Bank OF America CORP /DE/ | 5.09M | 2.10% | $48.5M | added +231.6% | ≤2013 |
| Aberdeen Group plc | 5.04M | 2.08% | $48.0M | added +451.7% | 2025 Q4 |
| Frazier Life Sciences Management, L.p. (focused) | 4.01M | 1.66% | $38.2M | opened | 2026 Q1 |
| Royalty Pharma Sub-Manager, LLC (focused) | 3.85M | 1.59% | $36.6M | unchanged | 2025 Q4 |
| Nuveen | 3.82M | 1.58% | $36.4M | added +5.7% | 2019 Q2 |
| Gw&k Investment Management, LLC | 3.24M | 1.34% | $30.8M | added +2.5% | 2022 Q3 |
| Eversept Partners, LP | 3.04M | 1.25% | $28.9M | added +1.6% | 2022 Q4 |
| RFG Advisory, LLC | 2.87M | 1.19% | $27.3M | opened | 2026 Q1 |
| Susquehanna International Group | 2.82M | 1.16% | $26.8M | added +319.1% | 2019 Q2 |
| Fisher Investments | 2.73M | 1.13% | $26.0M | added +10.8% | 2021 Q2 |
| Dimensional Fund Advisors | 2.69M | 1.11% | $25.6M | added +119% | 2025 Q4 |
| Charles Schwab Investment Management | 2.35M | 0.97% | $22.4M | added +17.2% | ≤2013 |
| Goldman Sachs | 2.35M | 0.97% | $22.3M | trimmed -26.9% | ≤2013 |
| Candriam S.c.a. | 2.29M | 0.94% | $21.8M | opened | 2026 Q1 |
| Rice Hall James & Associates, LLC | 2.23M | 0.92% | $21.2M | added +17.1% | 2023 Q2 |
| Northern Trust | 2.10M | 0.87% | $20.0M | added +13.3% | ≤2013 |
| Morgan Stanley | 2.02M | 0.83% | $19.3M | added +15.9% | ≤2013 |
| Nantahala Capital Management, LLC | 1.99M | 0.82% | $18.9M | added +46.5% | 2025 Q4 |
| Stifel Financial CORP | 1.83M | 0.75% | $17.4M | unchanged | 2020 Q1 |
| Parkman Healthcare Partners LLC | 1.71M | 0.70% | $16.3M | added +89.8% | 2024 Q2 |
| Orbimed Advisors LLC | 1.43M | 0.59% | $13.6M | trimmed -18.2% | 2025 Q3 |
| Legal & General Group PLC | 1.41M | 0.58% | $13.4M | added +568.8% | 2014 Q3 |
| Schonfeld Strategic Advisors | 1.34M | 0.55% | $12.7M | added +845.7% | 2024 Q2 |
| Invesco | 1.31M | 0.54% | $12.5M | trimmed -3.4% | 2020 Q2 |
| BNP Paribas Financial Markets | 1.31M | 0.54% | $12.4M | trimmed -48.7% | 2014 Q3 |
| Man Group | 1.29M | 0.53% | $12.3M | added +217.1% | 2024 Q3 |
| OP Asset Management LTD | 1.25M | 0.52% | $11.9M | added +800% | 2025 Q4 |
| Healthcare OF Ontario Pension Plan Trust Fund | 1.23M | 0.51% | $11.7M | opened | 2026 Q1 |
| Jupiter Asset Management LTD | 1.20M | 0.49% | $11.4M | unchanged | 2024 Q3 |
| Citadel Advisors | 1.02M | 0.42% | $9.7M | trimmed -21.6% | 2016 Q4 |
| Jacobs Levy Equity Management, INC | 1.00M | 0.41% | $9.6M | trimmed -2.6% | 2022 Q3 |
| Elmind Capital, LP (focused) | 1.00M | 0.41% | $9.5M | trimmed -53.5% | 2025 Q4 |
| Rosalind Advisors, INC. (focused) | 923.1k | 0.38% | $8.8M | opened | 2026 Q1 |
| Sphera Funds Management LTD. | 866.5k | 0.36% | $8.2M | added +3.4% | 2025 Q4 |
| Deutsche Bank AG\ | 821.4k | 0.34% | $7.8M | added +67.3% | ≤2013 |
| First Trust Advisors LP | 800.9k | 0.33% | $7.6M | added +113.6% | 2021 Q2 |
| Renaissance Technologies | 777.0k | 0.32% | $7.4M | trimmed -63.5% | 2023 Q3 |
Largest 50 of 289 shown; the full ranked, searchable register is at boothcheck.com/holders/BCRX. 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.