Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
441 institutional managers reported holding BBIO for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 51%. 82 opened new positions; 62 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 17.28M | 8.87% | $1.28B | added +2.4% | 2019 Q2 |
| BlackRock | 14.21M | 7.29% | $1.05B | trimmed -2.3% | 2019 Q3 |
| KKR (focused) | 13.26M | 6.81% | $984.2M | unchanged | 2019 Q2 |
| Janus Henderson | 13.18M | 6.77% | $978.1M | added +19.8% | 2019 Q2 |
| Viking Global | 11.84M | 6.08% | $878.9M | trimmed -17.7% | 2019 Q2 |
| Farallon Capital | 9.37M | 4.81% | $695.1M | added +4.1% | 2024 Q3 |
| Aisling Capital Management LP (focused) | 5.09M | 2.61% | $377.8M | unchanged | 2019 Q2 |
| State Street | 4.93M | 2.53% | $366.2M | trimmed -0.6% | 2019 Q3 |
| Geode Capital | 4.92M | 2.52% | $365.0M | added +11.5% | 2019 Q3 |
| Invesco | 4.59M | 2.36% | $340.9M | trimmed -4.9% | 2019 Q4 |
| T. Rowe Price | 3.80M | 1.95% | $282.2M | trimmed -0.7% | 2020 Q1 |
| Frazier Life Sciences Management, L.p. (focused) | 3.45M | 1.77% | $255.9M | trimmed -2.7% | 2023 Q1 |
| Citadel Advisors | 3.17M | 1.63% | $235.6M | added +354.6% | 2020 Q1 |
| Two Sigma | 3.12M | 1.60% | $231.6M | added +60.3% | 2020 Q3 |
| D. E. Shaw | 2.55M | 1.31% | $188.9M | added +15% | 2021 Q1 |
| Polar Capital Holdings PLC | 2.52M | 1.29% | $187.0M | added +93.9% | 2025 Q3 |
| Wellington Management | 2.48M | 1.27% | $184.4M | added +5.8% | 2023 Q3 |
| Franklin Resources | 2.44M | 1.25% | $181.0M | added +12.7% | 2024 Q1 |
| UBS | 2.43M | 1.25% | $180.3M | added +4.4% | 2019 Q2 |
| FMR (Fidelity) | 2.34M | 1.20% | $174.0M | trimmed -1.9% | 2019 Q2 |
| Manufacturers Life Insurance Company, THE | 1.98M | 1.01% | $146.7M | unchanged | 2019 Q3 |
| Charles Schwab Investment Management | 1.98M | 1.01% | $146.7M | added +0.6% | 2019 Q3 |
| AllianceBernstein | 1.91M | 0.98% | $141.7M | trimmed -6.9% | 2019 Q4 |
| Goldman Sachs | 1.90M | 0.97% | $140.8M | added +6.4% | 2019 Q2 |
| Morgan Stanley | 1.88M | 0.96% | $139.3M | added +34.1% | 2019 Q2 |
| SC US (TTGP), LTD. (focused) | 1.86M | 0.95% | $138.1M | unchanged | 2019 Q2 |
| Nomura Asset Management International INC. | 1.85M | 0.95% | $137.6M | trimmed -8.9% | 2020 Q3 |
| Jane Street | 1.76M | 0.90% | $130.5M | added +414.2% | 2020 Q2 |
| Northern Trust | 1.40M | 0.72% | $104.2M | added +4.2% | 2019 Q3 |
| BNP Paribas Financial Markets | 1.40M | 0.72% | $103.6M | trimmed -12.5% | 2019 Q3 |
| Pictet Asset Management Holding SA | 1.38M | 0.71% | $102.5M | added +8.7% | 2021 Q1 |
| Principal Financial Group INC | 1.33M | 0.68% | $98.7M | added +1.2% | 2020 Q1 |
| Bank OF America CORP /DE/ | 1.29M | 0.66% | $95.4M | added +19.3% | 2019 Q3 |
| Hood River Capital Management LLC | 1.27M | 0.65% | $93.9M | added +0.8% | 2025 Q3 |
| Laurion Capital Management LP | 1.26M | 0.65% | $93.7M | trimmed -9.9% | 2022 Q1 |
| Ameriprise Financial INC | 1.25M | 0.64% | $92.7M | added +48.4% | 2019 Q2 |
| Driehaus Capital Management LLC | 1.15M | 0.59% | $85.1M | trimmed -31.8% | 2025 Q1 |
| American Century Companies INC | 1.09M | 0.56% | $80.9M | trimmed -1.5% | 2020 Q2 |
| Lord, Abbett & CO. LLC | 1.02M | 0.53% | $76.0M | added +31% | 2025 Q1 |
| Gw&k Investment Management, LLC | 962.6k | 0.49% | $71.4M | added +53.7% | 2025 Q3 |
| Frontier Capital Management CO LLC | 958.0k | 0.49% | $71.1M | added +16% | 2024 Q1 |
| Clearbridge Investments, LLC | 951.2k | 0.49% | $70.6M | added +90.9% | 2025 Q2 |
| Allspring Global Investments Holdings, LLC | 889.4k | 0.46% | $66.0M | trimmed -10.5% | 2021 Q4 |
| Cormorant Asset Management, LP (focused) | 850.0k | 0.44% | $63.1M | trimmed -29.2% | 2019 Q2 |
| Deep Track Capital, LP | 841.4k | 0.43% | $62.5M | added +3.9% | 2024 Q4 |
| Ensign Peak Advisors, INC | 836.6k | 0.43% | $62.1M | trimmed -33.8% | 2019 Q4 |
| Capital Research Global Investors | 763.7k | 0.39% | $56.7M | trimmed -60.5% | 2023 Q3 |
| Citigroup INC | 746.5k | 0.38% | $55.4M | added +6.6% | 2019 Q3 |
| Panagora Asset Management INC | 742.1k | 0.38% | $55.1M | unchanged | 2023 Q2 |
| First Turn Management, LLC (focused) | 695.7k | 0.36% | $51.6M | added +16.8% | 2024 Q3 |
Largest 50 of 441 shown; the full ranked, searchable register is at boothcheck.com/holders/BBIO. 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.