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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, Q1 2024

Institutional positions in Generation Bio Co. as of Mar 31, 2024. 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
77
+1 vs. Q4 2023
Shares held
55.0M
+2.38M (+4.5%) vs. Q4 2023
Total value
$223.7M
+$136.9M (+157.8%) vs. Q4 2023
New holders
13
26 more added
Sold out
12
27 more reduced

Compare with Q4 2023: 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 holdersQ1 2024: 77 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 heldQ1 2024: $223.7M
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, Q1 2024

Shares, value and share of portfolio for each institution holding Generation Bio Co.; share changes are against Q4 2023.

Institutions holding GBIO in Q1 2024
InstitutionSharesValue% of portfolioChange in sharesAction
Price T Rowe Associates Inc8,878,361$36.1M0.00%+1,952,187+28.2%Added
Atlas Venture Life Science Advisors, LLC8,279,484$33.7M3.11%00.0%Unchanged
FMR LLC5,334,259$21.7M0.00%−18,140−0.3%Reduced
Bellevue Group AG3,861,575$15.7M0.24%+244,495+6.8%Added
BlackRock Inc.3,048,849$12.4M0.00%−119,566−3.8%Reduced
Bank of America Corp2,989,606$12.2M0.00%+461,744+18.3%Added
Artal Group S.A.2,830,591$11.5M0.30%+16,400+0.6%Added
Vanguard Group Inc2,570,456$10.5M0.00%+18,205+0.7%Added
EcoR1 Capital, LLC2,046,867$8.33M0.21%00.0%Unchanged
PFM Health Sciences, LP1,622,487$6.60M0.33%00.0%Unchanged
Deutsche Bank AG1,251,566$5.09M0.00%+19,250+1.6%Added
Goldman Sachs Group Inc1,242,091$5.06M0.00%+82,585+7.1%Added
Geode Capital Management, LLC1,070,689$4.36M0.00%−7,274−0.7%Reduced
State Street Corp964,609$3.93M0.00%+42,622+4.6%Added
Morgan Stanley941,782$3.83M0.00%−122,282−11.5%Reduced
UBS Group AG868,100$3.53M0.00%+701+0.1%Added
Renaissance Technologies LLC664,500$2.71M0.00%−24,900−3.6%Reduced
Dimensional Fund Advisors LP504,251$2.05M0.00%−178,849−26.2%Reduced
Acadian Asset Management LLC479,835$1.95M0.01%+255,468+113.9%Added
D. E. Shaw & Co., Inc.443,708$1.81M0.00%+160,600+56.7%Added
Charles Schwab Investment Management Inc389,255$1.58M0.00%+7,775+2.0%Added
Northern Trust Corp383,286$1.56M0.00%+10,201+2.7%Added
Los Angeles Capital Management LLC381,661$1.55M0.01%+105,827+38.4%Added
Baker Bros. Advisors LP371,219$1.51M0.02%+371,219New
TD Asset Management Inc340,686$1.39M0.00%00.0%Unchanged
Two Sigma Advisers, LP333,600$1.36M0.00%+121,200+57.1%Added
Two Sigma Investments, LP314,151$1.28M0.00%−2,926−0.9%Reduced
JPMorgan Chase & Co268,078$1.09M0.00%−17,808−6.2%Reduced
Bridgeway Capital Management, LLC241,600$983.3K0.02%−1,400−0.6%Reduced
Millennium Management LLC222,743$906.6K0.00%−530,002−70.4%Reduced
Yiheng Capital Management, L.P.191,530$779.5K0.11%+191,530New
Nuveen Asset Management, LLC169,265$688.9K0.00%−59,680−26.1%Reduced
XTX Topco Ltd166,207$676.5K0.09%+19,804+13.5%Added
Manufacturers Life Insurance Company, The151,469$616.5K0.00%+7,150+5.0%Added
Bank of New York Mellon Corp142,378$579.5K0.00%−17,159−10.8%Reduced
Connor, Clark & Lunn Investment Management Ltd.90,759$369.4K0.00%+62,242+218.3%Added
Panagora Asset Management Inc87,943$357.9K0.00%+58,305+196.7%Added
Cornercap Investment Counsel Inc74,170$301.9K0.05%+35,712+92.9%Added
Rhumbline Advisers73,473$299.0K0.00%+1,604+2.2%Added
Alliancebernstein L.P.65,285$265.7K0.00%00.0%Unchanged
Gsa Capital Partners LLP64,244$261.0K0.02%−65,826−50.6%Reduced
Citadel Advisors LLC57,621$234.5K0.00%−68,559−54.3%Reduced
Kestra Private Wealth Services, LLC52,300$212.9K0.00%+21,800+71.5%Added
Prudential Financial Inc41,175$167.6K0.00%+12,800+45.1%Added
Man Group plc38,317$155.9K0.00%+38,317New
Barclays PLC37,405$152.2K0.00%−30,456−44.9%Reduced
Jacobs Levy Equity Management, Inc32,352$131.7K0.00%−56,183−63.5%Reduced
Jane Street Group, LLC28,423$115.7K0.00%−78,605−73.4%Reduced
Simplex Trading, LLC25,092$102.0K0.00%+12,276+95.8%Added
MetLife Investment Management24,356$99.1K0.00%+24,356New
American International Group, Inc.22,317$90.8K0.00%−191−0.8%Reduced
Mirae Asset Global Investments Co., Ltd.18,259$87.5K0.00%+18,259New
Wells Fargo & Company20,372$82.9K0.00%+2,054+11.2%Added
Susquehanna International Group, LLP17,841$72.6K0.00%−22,907−56.2%Reduced
SG Americas Securities, LLC16,626$68.0K0.00%−31,844−65.7%Reduced
Voya Investment Management LLC16,253$66.2K0.00%−2,649−14.0%Reduced
Invesco Ltd.15,427$62.8K0.00%−62,718−80.3%Reduced
American Century Companies Inc10,619$43.2K0.00%+10,619New
PFG Advisors10,000$40.7K0.00%+10,000New
Cubist Systematic Strategies, LLC9,971$40.6K0.00%−6,506−39.5%Reduced
Citigroup Inc8,512$34.6K0.00%+2,041+31.5%Added
Royal Bank of Canada7,032$28.0K0.00%−13,044−65.0%Reduced
Tower Research Capital LLC (TRC)4,584$18.7K0.00%−4,134−47.4%Reduced
California State Teachers Retirement System4,553$18.5K0.00%−2,901−38.9%Reduced
Legal & General Group Plc3,919$16.0K0.00%00.0%Unchanged
Ameritas Investment Partners, Inc.3,277$13.3K0.00%00.0%Unchanged
New York State Common Retirement Fund2,659$10.8K0.00%00.0%Unchanged
Metropolitan Life Insurance Co2,507$10.2K0.00%+2,507New
Amalgamated Bank1,526$6.00K0.00%−2,423−61.4%Reduced
Point72 (DIFC) Ltd218$8870.00%+218New
GAMMA Investing LLC79$3220.00%00.0%Unchanged
Nisa Investment Advisors, LLC15$610.00%+15New
Nelson, Van Denburg & Campbell Wealth Management Group, LLC9$360.00%+9New
First Horizon Advisors, Inc.2$80.00%00.0%Unchanged
Huntington National Bank1$40.00%00.0%Unchanged
CWM, LLC2$00.00%+2New
Capital Advisors, Ltd. LLC38$00.00%+38New
Marshall Wace, LLP0$00.00%−123,587−100.0%Sold out
Squarepoint Ops LLC0$00.00%−110,232−100.0%Sold out
Weiss Asset Management LP0$00.00%−81,630−100.0%Sold out
Engineers Gate Manager LP0$00.00%−40,121−100.0%Sold out
State of Wisconsin Investment Board0$00.00%−36,900−100.0%Sold out
Point72 Middle East FZE0$00.00%−29,338−100.0%Sold out
Envestnet Asset Management Inc0$00.00%−17,917−100.0%Sold out
Advisor Group Holdings, Inc.0$00.00%−17,917−100.0%Sold out
State Board of Administration of Florida Retirement System0$00.00%−13,030−100.0%Sold out
Lazard Asset Management LLC0$00.00%−3,061−100.0%Sold out
Qube Research & Technologies Ltd0$00.00%−386−100.0%Sold out
Federated Hermes, Inc.0$00.00%−340−100.0%Sold out