Generation Bio Co.
GBIODelisted Feb 9, 2026- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001733294
Generation Bio Co. was delisted on Feb 9, 2026; its insiders filed their last Form 4 on Feb 9, 2026; 48 institutions reported holding it in 13F filings for Q4 2025, worth $24.5M in total; no superinvestor held it.
13F holders, Q4 2025
Institutional positions in Generation Bio Co. as of Dec 31, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 48
- +7 vs. Q3 2025
- Shares held
- 4.31M
- +342.9K (+8.6%) vs. Q3 2025
- Total value
- $24.5M
- +$282.7K (+1.2%) vs. Q3 2025
- New holders
- 11
- 10 more added
- Sold out
- 4
- 15 more reduced
Compare with Q3 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting GBIO on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 1 | $0 |
| Q1 2026 | 2 | $53.3K |
| Q4 2025 | 48 | $24.5M |
| Q3 2025 | 41 | $24.2M |
| Q2 2025 | 63 | $13.3M |
| Q1 2025 | 81 | $19.3M |
| Q4 2024 | 80 | $57.1M |
| Q3 2024 | 77 | $136.4M |
| Q2 2024 | 79 | $156.5M |
| Q1 2024 | 77 | $223.7M |
| Q4 2023 | 76 | $86.7M |
| Q3 2023 | 77 | $216.8M |
| Q2 2023 | 81 | $315.1M |
| Q1 2023 | 86 | $246.8M |
| Q4 2022 | 98 | $224.5M |
| Q3 2022 | 115 | $306.3M |
| Q2 2022 | 95 | $363.5M |
| Q1 2022 | 89 | $415.8M |
| Q4 2021 | 89 | $390.3M |
| Q3 2021 | 82 | $1.20B |
| Q2 2021 | 98 | $1.25B |
| Q1 2021 | 88 | $1.27B |
Institutions, Q4 2025
Shares, value and share of portfolio for each institution holding Generation Bio Co.; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Atlas Venture Life Science Advisors, LLC | 827,946 | $4.70M | 0.54% | 00.0% | Unchanged |
| SymBiosis Capital Partners, LLC | 665,000 | $3.78M | 3.45% | +665,000 | New |
| Opaleye Management Inc. | 310,000 | $1.76M | 0.23% | +310,000 | New |
| Renaissance Technologies LLC | 287,614 | $1.63M | 0.00% | −56,649−16.5% | Reduced |
| Vanguard Group Inc | 229,833 | $1.31M | 0.00% | 00.0% | Unchanged |
| Price T Rowe Associates Inc | 209,641 | $1.19M | 0.00% | −367,148−63.7% | Reduced |
| Siren, L.L.C. | 201,419 | $1.14M | 0.03% | −95,473−32.2% | Reduced |
| UBS Group AG | 164,716 | $935.6K | 0.00% | +15,995+10.8% | Added |
| Morgan Stanley | 161,378 | $916.6K | 0.00% | −2,892−1.8% | Reduced |
| Marshall Wace, LLP | 140,294 | $796.9K | 0.00% | −78,167−35.8% | Reduced |
| Acadian Asset Management LLC | 121,029 | $686.0K | 0.00% | −6,477−5.1% | Reduced |
| Yiheng Capital Management, L.P. | 105,524 | $599.4K | 0.26% | 00.0% | Unchanged |
| Rangeley Capital, LLC | 98,280 | $558.2K | 0.48% | +98,280 | New |
| Goldman Sachs Group Inc | 91,527 | $519.9K | 0.00% | −27,056−22.8% | Reduced |
| Millennium Management LLC | 88,563 | $503.0K | 0.00% | −8,791−9.0% | Reduced |
| Bank of America Corp | 84,842 | $481.9K | 0.00% | +250.0% | Added |
| BlackRock, Inc. | 60,070 | $341.2K | 0.00% | −46−0.1% | Reduced |
| Geode Capital Management, LLC | 51,795 | $294.3K | 0.00% | +1,990+4.0% | Added |
| Two Sigma Investments, LP | 50,557 | $287.2K | 0.00% | +38,115+306.3% | Added |
| Citadel Advisors LLC | 47,245 | $268.4K | 0.00% | +48+0.1% | Added |
| DRW Securities, LLC | 43,812 | $248.9K | 0.02% | +43,812 | New |
| Deltec Asset Management LLC | 32,650 | $185.5K | 0.03% | +32,650 | New |
| TD Asset Management Inc | 26,708 | $151.7K | 0.00% | 00.0% | Unchanged |
| Lynx1 Capital Management LP | 25,000 | $142.0K | 0.03% | +25,000 | New |
| Torno Capital, LLC | 25,000 | $142.0K | 0.06% | +25,000 | New |
| ADAR1 Capital Management, LLC | 22,144 | $125.8K | 0.01% | 00.0% | Unchanged |
| State Street Corp | 19,993 | $113.6K | 0.00% | 00.0% | Unchanged |
| Shay Capital LLC | 19,839 | $112.7K | 0.02% | +9,425+90.5% | Added |
| CSS LLC | 17,464 | $99.2K | 0.01% | +17,464 | New |
| Northern Trust Corp | 17,058 | $96.9K | 0.00% | +3,752+28.2% | Added |
| Palo Alto Investors LP | 15,047 | $85.5K | 0.01% | 00.0% | Unchanged |
| Manufacturers Life Insurance Company, The | 14,398 | $80.5K | 0.00% | 00.0% | Unchanged |
| XTX Topco Ltd | 13,122 | $74.5K | 0.00% | +1,778+15.7% | Added |
| Two Sigma Advisers, LP | 11,930 | $67.8K | 0.00% | +11,930 | New |
| Seven Fleet Capital Management LP | 5,376 | $30.5K | 0.02% | +5,376 | New |
| Accent Capital Management, LLC | 26 | $17.0K | 0.01% | −12−31.6% | Reduced |
| FMR LLC | 2,617 | $14.9K | 0.00% | −10,414−79.9% | Reduced |
| Royal Bank of Canada | 992 | $6.00K | 0.00% | −97−8.9% | Reduced |
| JPMorgan Chase & Co | 689 | $3.91K | 0.00% | +2+0.3% | Added |
| Rockefeller Capital Management L.P. | 500 | $2.84K | 0.00% | +150+42.9% | Added |
| Sterling Capital Management LLC | 194 | $1.10K | 0.00% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 147 | $835 | 0.00% | −7−4.5% | Reduced |
| SBI Securities Co., Ltd. | 53 | $301 | 0.00% | 00.0% | Unchanged |
| Wells Fargo & Company | 50 | $284 | 0.00% | 00.0% | Unchanged |
| Optiver Holding B.V. | 2 | $11 | 0.00% | −3−60.0% | Reduced |
| Smartleaf Asset Management LLC | 1 | $6 | 0.00% | +1 | New |
| Huntington National Bank | 1 | $0 | 0.00% | 00.0% | Unchanged |
| CWM, LLC | 1 | $0 | 0.00% | −7−87.5% | Reduced |
| Baker Bros. Advisors LP | 0 | $0 | 0.00% | −194,493−100.0% | Sold out |
| Cantor Fitzgerald, L. P. | 0 | $0 | 0.00% | −99,000−100.0% | Sold out |
| Advisor Group Holdings, Inc. | 0 | $0 | 0.00% | −15,459−100.0% | Sold out |
| Citigroup Inc | 0 | $0 | 0.00% | −668−100.0% | Sold out |