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
GBIO is no longer listed, so this page shows Q4 2025. 13F filings for later quarters list far fewer holders.
- 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 |
|---|---|---|---|---|---|
| Huntington National Bank | 1 | $0 | 0.00% | 00.0% | Unchanged |
| CWM, LLC | 1 | $0 | 0.00% | −7−87.5% | Reduced |
| Smartleaf Asset Management LLC | 1 | $6 | 0.00% | +1 | New |
| Optiver Holding B.V. | 2 | $11 | 0.00% | −3−60.0% | Reduced |
| Wells Fargo & Company | 50 | $284 | 0.00% | 00.0% | Unchanged |
| SBI Securities Co., Ltd. | 53 | $301 | 0.00% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 147 | $835 | 0.00% | −7−4.5% | Reduced |
| Sterling Capital Management LLC | 194 | $1.10K | 0.00% | 00.0% | Unchanged |
| Rockefeller Capital Management L.P. | 500 | $2.84K | 0.00% | +150+42.9% | Added |
| JPMorgan Chase & Co | 689 | $3.91K | 0.00% | +2+0.3% | Added |
| Royal Bank of Canada | 992 | $6.00K | 0.00% | −97−8.9% | Reduced |
| FMR LLC | 2,617 | $14.9K | 0.00% | −10,414−79.9% | Reduced |
| Accent Capital Management, LLC | 26 | $17.0K | 0.01% | −12−31.6% | Reduced |
| Seven Fleet Capital Management LP | 5,376 | $30.5K | 0.02% | +5,376 | New |
| Two Sigma Advisers, LP | 11,930 | $67.8K | 0.00% | +11,930 | New |
| XTX Topco Ltd | 13,122 | $74.5K | 0.00% | +1,778+15.7% | Added |
| Manufacturers Life Insurance Company, The | 14,398 | $80.5K | 0.00% | 00.0% | Unchanged |
| Palo Alto Investors LP | 15,047 | $85.5K | 0.01% | 00.0% | Unchanged |
| Northern Trust Corp | 17,058 | $96.9K | 0.00% | +3,752+28.2% | Added |
| CSS LLC | 17,464 | $99.2K | 0.01% | +17,464 | New |
| Shay Capital LLC | 19,839 | $112.7K | 0.02% | +9,425+90.5% | Added |
| State Street Corp | 19,993 | $113.6K | 0.00% | 00.0% | Unchanged |
| ADAR1 Capital Management, LLC | 22,144 | $125.8K | 0.01% | 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 |
| TD Asset Management Inc | 26,708 | $151.7K | 0.00% | 00.0% | Unchanged |
| Deltec Asset Management LLC | 32,650 | $185.5K | 0.03% | +32,650 | New |
| DRW Securities, LLC | 43,812 | $248.9K | 0.02% | +43,812 | New |
| Citadel Advisors LLC | 47,245 | $268.4K | 0.00% | +48+0.1% | Added |
| Two Sigma Investments, LP | 50,557 | $287.2K | 0.00% | +38,115+306.3% | Added |
| Geode Capital Management, LLC | 51,795 | $294.3K | 0.00% | +1,990+4.0% | Added |
| BlackRock, Inc. | 60,070 | $341.2K | 0.00% | −46−0.1% | Reduced |
| Bank of America Corp | 84,842 | $481.9K | 0.00% | +250.0% | Added |
| Millennium Management LLC | 88,563 | $503.0K | 0.00% | −8,791−9.0% | Reduced |
| Goldman Sachs Group Inc | 91,527 | $519.9K | 0.00% | −27,056−22.8% | Reduced |
| Rangeley Capital, LLC | 98,280 | $558.2K | 0.48% | +98,280 | New |
| Yiheng Capital Management, L.P. | 105,524 | $599.4K | 0.26% | 00.0% | Unchanged |
| Acadian Asset Management LLC | 121,029 | $686.0K | 0.00% | −6,477−5.1% | Reduced |
| Marshall Wace, LLP | 140,294 | $796.9K | 0.00% | −78,167−35.8% | Reduced |
| Morgan Stanley | 161,378 | $916.6K | 0.00% | −2,892−1.8% | Reduced |
| UBS Group AG | 164,716 | $935.6K | 0.00% | +15,995+10.8% | Added |
| Siren, L.L.C. | 201,419 | $1.14M | 0.03% | −95,473−32.2% | Reduced |
| Price T Rowe Associates Inc | 209,641 | $1.19M | 0.00% | −367,148−63.7% | Reduced |
| Vanguard Group Inc | 229,833 | $1.31M | 0.00% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 287,614 | $1.63M | 0.00% | −56,649−16.5% | Reduced |
| Opaleye Management Inc. | 310,000 | $1.76M | 0.23% | +310,000 | New |
| SymBiosis Capital Partners, LLC | 665,000 | $3.78M | 3.45% | +665,000 | New |
| Atlas Venture Life Science Advisors, LLC | 827,946 | $4.70M | 0.54% | 00.0% | Unchanged |
| 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 |