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, Q1 2026
Institutional positions in Generation Bio Co. as of Mar 31, 2026. 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, and 13F filings after Q4 2025 list far fewer holders. See Q4 2025
- Institutional holders
- 2
- −45 vs. Q4 2025
- Shares held
- 62
- −4.08M (−100.0%) vs. Q4 2025
- Total value
- $53.3K
- −$23.1M (−99.8%) vs. Q4 2025
- New holders
- 0
- 1 more added
- Sold out
- 45
- 0 more reduced
1 institution that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 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, Q1 2026
Shares, value and share of portfolio for each institution holding Generation Bio Co.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Accent Capital Management, LLC | 61 | $53.3K | 0.03% | +35+134.6% | Added |
| Huntington National Bank | 1 | $0 | 0.00% | 00.0% | Unchanged |
| Atlas Venture Life Science Advisors, LLC | 0 | $0 | 0.00% | −827,946−100.0% | Sold out |
| SymBiosis Capital Partners, LLC | 0 | $0 | 0.00% | −665,000−100.0% | Sold out |
| Opaleye Management Inc. | 0 | $0 | 0.00% | −310,000−100.0% | Sold out |
| Renaissance Technologies LLC | 0 | $0 | 0.00% | −287,614−100.0% | Sold out |
| Price T Rowe Associates Inc | 0 | $0 | 0.00% | −209,641−100.0% | Sold out |
| Siren, L.L.C. | 0 | $0 | 0.00% | −201,419−100.0% | Sold out |
| UBS Group AG | 0 | $0 | 0.00% | −164,716−100.0% | Sold out |
| Morgan Stanley | 0 | $0 | 0.00% | −161,378−100.0% | Sold out |
| Marshall Wace, LLP | 0 | $0 | 0.00% | −140,294−100.0% | Sold out |
| Acadian Asset Management LLC | 0 | $0 | 0.00% | −121,029−100.0% | Sold out |
| Yiheng Capital Management, L.P. | 0 | $0 | 0.00% | −105,524−100.0% | Sold out |
| Rangeley Capital, LLC | 0 | $0 | 0.00% | −98,280−100.0% | Sold out |
| Goldman Sachs Group Inc | 0 | $0 | 0.00% | −91,527−100.0% | Sold out |
| Millennium Management LLC | 0 | $0 | 0.00% | −88,563−100.0% | Sold out |
| Bank of America Corp | 0 | $0 | 0.00% | −84,842−100.0% | Sold out |
| BlackRock, Inc. | 0 | $0 | 0.00% | −60,070−100.0% | Sold out |
| Geode Capital Management, LLC | 0 | $0 | 0.00% | −51,795−100.0% | Sold out |
| Two Sigma Investments, LP | 0 | $0 | 0.00% | −50,557−100.0% | Sold out |
| Citadel Advisors LLC | 0 | $0 | 0.00% | −47,245−100.0% | Sold out |
| DRW Securities, LLC | 0 | $0 | 0.00% | −43,812−100.0% | Sold out |
| Deltec Asset Management LLC | 0 | $0 | 0.00% | −32,650−100.0% | Sold out |
| TD Asset Management Inc | 0 | $0 | 0.00% | −26,708−100.0% | Sold out |
| Lynx1 Capital Management LP | 0 | $0 | 0.00% | −25,000−100.0% | Sold out |
| Torno Capital, LLC | 0 | $0 | 0.00% | −25,000−100.0% | Sold out |
| ADAR1 Capital Management, LLC | 0 | $0 | 0.00% | −22,144−100.0% | Sold out |
| State Street Corp | 0 | $0 | 0.00% | −19,993−100.0% | Sold out |
| Shay Capital LLC | 0 | $0 | 0.00% | −19,839−100.0% | Sold out |
| CSS LLC | 0 | $0 | 0.00% | −17,464−100.0% | Sold out |
| Northern Trust Corp | 0 | $0 | 0.00% | −17,058−100.0% | Sold out |
| Palo Alto Investors LP | 0 | $0 | 0.00% | −15,047−100.0% | Sold out |
| Manufacturers Life Insurance Company, The | 0 | $0 | 0.00% | −14,398−100.0% | Sold out |
| XTX Topco Ltd | 0 | $0 | 0.00% | −13,122−100.0% | Sold out |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −11,930−100.0% | Sold out |
| Seven Fleet Capital Management LP | 0 | $0 | 0.00% | −5,376−100.0% | Sold out |
| FMR LLC | 0 | $0 | 0.00% | −2,617−100.0% | Sold out |
| Royal Bank of Canada | 0 | $0 | 0.00% | −992−100.0% | Sold out |
| JPMorgan Chase & Co | 0 | $0 | 0.00% | −689−100.0% | Sold out |
| Rockefeller Capital Management L.P. | 0 | $0 | 0.00% | −500−100.0% | Sold out |
| Sterling Capital Management LLC | 0 | $0 | 0.00% | −194−100.0% | Sold out |
| BNP Paribas Arbitrage, SA | 0 | $0 | 0.00% | −147−100.0% | Sold out |
| SBI Securities Co., Ltd. | 0 | $0 | 0.00% | −53−100.0% | Sold out |
| Wells Fargo & Company | 0 | $0 | 0.00% | −50−100.0% | Sold out |
| Optiver Holding B.V. | 0 | $0 | 0.00% | −2−100.0% | Sold out |
| Smartleaf Asset Management LLC | 0 | $0 | 0.00% | −1−100.0% | Sold out |
| CWM, LLC | 0 | $0 | 0.00% | −1−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |