Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
376 institutional managers reported holding BIO for the quarter ended Mar 31, 2026. Together they hold about 74% of shares outstanding; the top 10 hold 40%. 53 opened new positions; 68 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| First Eagle Investment Management | 2.60M | 9.65% | $725.7M | added +1.3% | 2023 Q2 |
| Vanguard Group | 1.81M | 6.70% | $503.9M | added +1.7% | ≤2013 |
| BlackRock | 1.68M | 6.23% | $468.4M | unchanged | ≤2013 |
| Dimensional Fund Advisors | 1.09M | 4.04% | $303.7M | added +1.1% | ≤2013 |
| Ariel Investments, LLC | 786.0k | 2.92% | $219.1M | added +2.8% | ≤2013 |
| UBS | 780.4k | 2.90% | $217.6M | added +27.7% | ≤2013 |
| Earnest Partners LLC | 588.7k | 2.18% | $164.1M | trimmed -2.5% | 2013 Q4 |
| State Street | 559.6k | 2.08% | $156.0M | unchanged | ≤2013 |
| Capital Group (American Funds) | 450.0k | 1.67% | $125.5M | opened | 2026 Q1 |
| Bank OF America CORP /DE/ | 445.0k | 1.65% | $124.1M | unchanged | ≤2013 |
| First Manhattan CO. LLC. | 407.4k | 1.51% | $113.6M | added +1% | 2023 Q3 |
| MFS Investment Management | 396.1k | 1.47% | $110.4M | trimmed -0.8% | 2023 Q3 |
| Capital Research Global Investors | 385.6k | 1.43% | $107.5M | trimmed -22% | 2025 Q3 |
| Geode Capital | 364.7k | 1.35% | $101.7M | added +7.8% | ≤2013 |
| SEI Investments CO | 287.9k | 1.07% | $80.3M | trimmed -1.4% | 2013 Q3 |
| Barclays PLC | 278.8k | 1.03% | $77.7M | added +1038.4% | ≤2013 |
| Morgan Stanley | 273.9k | 1.02% | $76.4M | added +47% | ≤2013 |
| Parnassus Investments | 254.3k | 0.94% | $70.9M | added +0.9% | 2023 Q3 |
| Deerfield Management Company, L.p. | 226.1k | 0.84% | $63.0M | unchanged | 2023 Q3 |
| Northern Trust | 218.5k | 0.81% | $60.9M | added +1.1% | ≤2013 |
| Nomura Asset Management International INC. | 217.3k | 0.81% | $60.6M | opened | 2026 Q1 |
| Charles Schwab Investment Management | 196.6k | 0.73% | $54.8M | added +9% | ≤2013 |
| Mawer Investment Management LTD. | 188.8k | 0.70% | $52.6M | trimmed -19.3% | 2020 Q4 |
| Thompson Siegel & Walmsley LLC | 176.5k | 0.66% | $49.2M | trimmed -8.1% | 2022 Q3 |
| Gw&k Investment Management, LLC | 174.7k | 0.65% | $48.7M | trimmed -1.3% | 2018 Q3 |
| Franklin Resources | 170.4k | 0.63% | $47.5M | added +24.1% | 2014 Q4 |
| Southeastern Asset Management INC/TN/ (focused) | 162.8k | 0.60% | $45.4M | trimmed -28.5% | 2023 Q2 |
| Gotham Asset Management | 152.4k | 0.56% | $42.5M | added +30.2% | 2018 Q3 |
| Citadel Advisors | 148.7k | 0.55% | $41.4M | added +1468.2% | ≤2013 |
| Assenagon Asset Management S.a. | 147.8k | 0.55% | $41.2M | added +6586.3% | 2020 Q1 |
| Freestone Grove Partners LP | 147.6k | 0.55% | $41.2M | added +33.6% | 2024 Q4 |
| BNY Mellon | 126.9k | 0.47% | $35.4M | trimmed -1.9% | ≤2013 |
| Mangrove Partners IM, LLC | 126.9k | 0.47% | $35.4M | unchanged | 2025 Q3 |
| Cibc Bancorp USA INC. | 120.1k | 0.45% | $33.5M | added +73143.9% | 2018 Q3 |
| Fisher Investments | 118.7k | 0.44% | $33.1M | trimmed -9.5% | ≤2013 |
| Allianz Asset Management GmbH | 110.2k | 0.41% | $30.7M | unchanged | 2025 Q1 |
| Federated Hermes, INC. | 109.9k | 0.41% | $30.6M | trimmed -3.5% | ≤2013 |
| Envestnet Asset Management INC | 105.3k | 0.39% | $29.4M | added +11.4% | ≤2013 |
| Acadian Asset Management | 102.8k | 0.38% | $28.7M | trimmed -14.8% | 2020 Q2 |
| Manufacturers Life Insurance Company, THE | 99.7k | 0.37% | $27.8M | trimmed -18.6% | ≤2013 |
| Tikvah Management LLC (focused) | 97.8k | 0.36% | $27.3M | trimmed -11.9% | 2022 Q1 |
| Hound Partners, LLC (focused) | 97.7k | 0.36% | $27.2M | added +125.9% | 2022 Q2 |
| AQR Capital | 94.5k | 0.35% | $26.4M | added +135.2% | 2015 Q2 |
| Boston Trust Walden CORP | 93.5k | 0.35% | $26.1M | added +4.1% | 2025 Q3 |
| JNE Partners LLP (focused) | 92.1k | 0.34% | $25.7M | unchanged | 2025 Q2 |
| National Bank OF Canada /FI/ | 90.0k | 0.33% | $25.1M | opened | 2026 Q1 |
| ING Groep NV | 90.0k | 0.33% | $25.1M | opened | 2026 Q1 |
| Allspring Global Investments Holdings, LLC | 86.0k | 0.32% | $24.0M | trimmed -33.5% | 2021 Q4 |
| Qvidtvm Management LLC (focused) | 83.7k | 0.31% | $23.3M | unchanged | 2023 Q3 |
| Natixis Advisors, LLC | 82.0k | 0.30% | $22.9M | added +15.7% | 2019 Q1 |
Largest 50 of 376 shown; the full ranked, searchable register is at boothcheck.com/holders/BIO. 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.