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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, Q3 2025

Institutional positions in Generation Bio Co. as of Sep 30, 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
41
−21 vs. Q2 2025
Shares held
3.97M
−177.3K (−4.3%) vs. Q2 2025Converted for a 1-for-10 split
Total value
$24.2M
+$10.9M (+82.4%) vs. Q2 2025
New holders
6
13 more added
Sold out
27
11 more reduced

1 institution that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q2 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.

Institutional holdersQ3 2025: 41 institutions
Q1 2021: 88 institutionsQ2 2021: 98 institutionsQ3 2021: 82 institutionsQ4 2021: 89 institutionsQ1 2022: 89 institutionsQ2 2022: 95 institutionsQ3 2022: 115 institutionsQ4 2022: 98 institutionsQ1 2023: 86 institutionsQ2 2023: 81 institutionsQ3 2023: 77 institutionsQ4 2023: 76 institutionsQ1 2024: 77 institutionsQ2 2024: 79 institutionsQ3 2024: 77 institutionsQ4 2024: 80 institutionsQ1 2025: 81 institutionsQ2 2025: 63 institutionsQ3 2025: 41 institutionsQ4 2025: 48 institutionsQ1 2026: 2 institutionsQ2 2026: 1 institution
Value heldQ3 2025: $24.2M
Q1 2021: $1.27BQ2 2021: $1.25BQ3 2021: $1.20BQ4 2021: $390.3MQ1 2022: $415.8MQ2 2022: $363.5MQ3 2022: $306.3MQ4 2022: $224.5MQ1 2023: $246.8MQ2 2023: $315.1MQ3 2023: $216.8MQ4 2023: $86.7MQ1 2024: $223.7MQ2 2024: $156.5MQ3 2024: $136.4MQ4 2024: $57.1MQ1 2025: $19.3MQ2 2025: $13.3MQ3 2025: $24.2MQ4 2025: $24.5MQ1 2026: $53.3KQ2 2026: $0
Institutions holding GBIO and their total value by quarter
QuarterHoldersValue
Q2 20261$0
Q1 20262$53.3K
Q4 202548$24.5M
Q3 202541$24.2M
Q2 202563$13.3M
Q1 202581$19.3M
Q4 202480$57.1M
Q3 202477$136.4M
Q2 202479$156.5M
Q1 202477$223.7M
Q4 202376$86.7M
Q3 202377$216.8M
Q2 202381$315.1M
Q1 202386$246.8M
Q4 202298$224.5M
Q3 2022115$306.3M
Q2 202295$363.5M
Q1 202289$415.8M
Q4 202189$390.3M
Q3 202182$1.20B
Q2 202198$1.25B
Q1 202188$1.27B

Institutions, Q3 2025

Shares, value and share of portfolio for each institution holding Generation Bio Co.; share changes are against Q2 2025.

Institutions holding GBIO in Q3 2025
InstitutionSharesValue% of portfolioChange in sharesAction
Atlas Venture Life Science Advisors, LLC827,946$5.07M0.67%00.0%UnchangedConverted for a 1-for-10 split
Price T Rowe Associates Inc576,789$3.53M0.00%−269,472−31.8%ReducedConverted for a 1-for-10 split
Renaissance Technologies LLC344,263$2.11M0.00%+86,185+33.4%AddedConverted for a 1-for-10 split
Siren, L.L.C.296,892$1.82M0.07%00.0%UnchangedConverted for a 1-for-10 split
Vanguard Group Inc229,833$1.41M0.00%00.0%UnchangedConverted for a 1-for-10 split
Marshall Wace, LLP218,461$1.34M0.00%+206,841+1,780.0%AddedConverted for a 1-for-10 split
Baker Bros. Advisors LP194,493$1.19M0.01%00.0%UnchangedConverted for a 1-for-10 split
Morgan Stanley164,270$1.01M0.00%+72,987+80.0%AddedConverted for a 1-for-10 split
UBS Group AG148,721$910.2K0.00%+60,231+68.1%AddedConverted for a 1-for-10 split
Acadian Asset Management LLC127,506$779.0K0.00%+4,159+3.4%AddedConverted for a 1-for-10 split
Goldman Sachs Group Inc118,583$725.7K0.00%+12,174+11.4%AddedConverted for a 1-for-10 split
Yiheng Capital Management, L.P.105,524$645.8K0.21%00.0%UnchangedConverted for a 1-for-10 split
Cantor Fitzgerald, L. P.99,000$605.9K0.01%+99,000New
Millennium Management LLC97,354$595.8K0.00%−8,807−8.3%ReducedConverted for a 1-for-10 split
Bank of America Corp84,817$519.1K0.00%−2,378−2.7%ReducedConverted for a 1-for-10 split
BlackRock, Inc.60,116$367.9K0.00%−56,042−48.2%ReducedConverted for a 1-for-10 split
Geode Capital Management, LLC49,805$304.9K0.00%00.0%UnchangedConverted for a 1-for-10 split
Citadel Advisors LLC47,197$288.8K0.00%+27,981+145.6%AddedConverted for a 1-for-10 split
TD Asset Management Inc26,708$163.5K0.00%−7,361−21.6%ReducedConverted for a 1-for-10 split
ADAR1 Capital Management, LLC22,144$135.5K0.01%+22,144New
State Street Corp19,993$122.4K0.00%−619−3.0%ReducedConverted for a 1-for-10 split
Palo Alto Investors LP15,047$92.1K0.02%00.0%UnchangedConverted for a 1-for-10 split
Manufacturers Life Insurance Company, The14,398$88.1K0.00%00.0%UnchangedConverted for a 1-for-10 split
Northern Trust Corp13,306$81.4K0.00%00.0%UnchangedConverted for a 1-for-10 split
FMR LLC13,031$79.8K0.00%−221,531−94.4%ReducedConverted for a 1-for-10 split
Two Sigma Investments, LP12,442$76.1K0.00%+1,846+17.4%AddedConverted for a 1-for-10 split
XTX Topco Ltd11,344$69.4K0.00%+11,344New
Shay Capital LLC10,414$63.7K0.01%+10,414New
Accent Capital Management, LLC38$23.4K0.01%+34+900.0%AddedConverted for a 1-for-10 split
Royal Bank of Canada1,089$7.00K0.00%+788+261.2%AddedConverted for a 1-for-10 split
Advisor Group Holdings, Inc.15,459$4.95K0.00%+13,913+900.0%AddedConverted for a 1-for-10 split
JPMorgan Chase & Co687$4.20K0.00%+254+58.6%AddedConverted for a 1-for-10 split
Citigroup Inc668$4.09K0.00%−368−35.5%ReducedConverted for a 1-for-10 split
Rockefeller Capital Management L.P.350$2.14K0.00%+350New
Sterling Capital Management LLC194$1.19K0.00%00.0%UnchangedConverted for a 1-for-10 split
BNP Paribas Arbitrage, SA154$9420.00%−17−9.7%ReducedConverted for a 1-for-10 split
SBI Securities Co., Ltd.53$3240.00%00.0%UnchangedConverted for a 1-for-10 split
Wells Fargo & Company50$3060.00%−103−67.4%ReducedConverted for a 1-for-10 split
Optiver Holding B.V.5$310.00%+5New
CWM, LLC8$00.00%−657−98.8%ReducedConverted for a 1-for-10 split
Huntington National Bank1$00.00%+1+900.0%AddedConverted for a 1-for-10 split
Militia Capital Partners, LP0$00.00%−54,235−100.0%Sold outConverted for a 1-for-10 split
Squarepoint Ops LLC0$00.00%−51,827−100.0%Sold outConverted for a 1-for-10 split
Susquehanna International Group, LLP0$00.00%−24,928−100.0%Sold outConverted for a 1-for-10 split
Charles Schwab Investment Management Inc0$00.00%−23,686−100.0%Sold outConverted for a 1-for-10 split
Two Sigma Advisers, LP0$00.00%−19,140−100.0%Sold outConverted for a 1-for-10 split
Y-Intercept (Hong Kong) Ltd0$00.00%−14,819−100.0%Sold outConverted for a 1-for-10 split
Aegis Wealth Management LLC0$00.00%−8,889−100.0%Sold outConverted for a 1-for-10 split
Callan Family Office, LLC0$00.00%−6,974−100.0%Sold outConverted for a 1-for-10 split
AQR Capital Management LLC0$00.00%−6,369−100.0%Sold outConverted for a 1-for-10 split
Kestra Private Wealth Services, LLC0$00.00%−5,700−100.0%Sold outConverted for a 1-for-10 split
Qube Research & Technologies Ltd0$00.00%−5,559−100.0%Sold outConverted for a 1-for-10 split
Point72 Asia (Singapore) Pte. Ltd.0$00.00%−3,497−100.0%Sold outConverted for a 1-for-10 split
Two Sigma Securities, LLC0$00.00%−3,267−100.0%Sold outConverted for a 1-for-10 split
Abel Hall, LLC0$00.00%−2,357−100.0%Sold outConverted for a 1-for-10 split
Prudential Financial Inc0$00.00%−2,210−100.0%Sold outConverted for a 1-for-10 split
Tower Research Capital LLC (TRC)0$00.00%−1,595−100.0%Sold outConverted for a 1-for-10 split
PFG Advisors0$00.00%−1,500−100.0%Sold outConverted for a 1-for-10 split
Mariner, LLC0$00.00%−1,229−100.0%Sold outConverted for a 1-for-10 split
Barclays PLC0$00.00%−1,148−100.0%Sold outConverted for a 1-for-10 split
Jump Financial, LLC0$00.00%−1,028−100.0%Sold outConverted for a 1-for-10 split
Russell Investments Group, Ltd.0$00.00%−270−100.0%Sold outConverted for a 1-for-10 split
Point72 (DIFC) Ltd0$00.00%−145−100.0%Sold outConverted for a 1-for-10 split
Nisa Investment Advisors, LLC0$00.00%−122−100.0%Sold outConverted for a 1-for-10 split
Raymond James Financial Inc0$00.00%−60−100.0%Sold outConverted for a 1-for-10 split
EverSource Wealth Advisors, LLC0$00.00%−39−100.0%Sold outConverted for a 1-for-10 split
The PNC Financial Services Group, Inc.0$00.00%−26−100.0%Sold outConverted for a 1-for-10 split
Essential Partners LLC0$00.00%−13−100.0%Sold outConverted for a 1-for-10 split
First Horizon Advisors, Inc.––––Not filed