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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, Q4 2024

Institutional positions in Generation Bio Co. as of Dec 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
80
+3 vs. Q3 2024
Shares held
53.9M
−1.38M (−2.5%) vs. Q3 2024
Total value
$57.1M
−$79.3M (−58.2%) vs. Q3 2024
New holders
16
24 more added
Sold out
13
19 more reduced

Compare with Q3 2024: 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 holdersQ4 2024: 80 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 heldQ4 2024: $57.1M
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, Q4 2024

Shares, value and share of portfolio for each institution holding Generation Bio Co.; share changes are against Q3 2024.

Institutions holding GBIO in Q4 2024
InstitutionSharesValue% of portfolioChange in sharesAction
Price T Rowe Associates Inc9,279,059$9.84M0.00%−72,531−0.8%Reduced
Atlas Venture Life Science Advisors, LLC8,279,484$8.78M1.07%00.0%Unchanged
FMR LLC4,626,045$4.90M0.00%−694,221−13.0%Reduced
BlackRock, Inc.3,459,065$3.67M0.00%+43,067+1.3%Added
Bank of America Corp2,997,739$3.18M0.00%+14,647+0.5%Added
Siren, L.L.C.2,982,733$3.16M0.14%00.0%Unchanged
Vanguard Group Inc2,641,996$2.80M0.00%+6,274+0.2%Added
Jefferies Financial Group Inc.2,261,817$2.40M0.03%+2,261,817New
EcoR1 Capital, LLC2,046,867$2.17M0.09%00.0%Unchanged
Baker Bros. Advisors LP1,944,945$2.06M0.02%00.0%Unchanged
Goldman Sachs Group Inc1,208,269$1.28M0.00%+20,066+1.7%Added
Geode Capital Management, LLC1,137,075$1.21M0.00%−2,092−0.2%Reduced
UBS Group AG1,053,509$1.12M0.00%+206,623+24.4%Added
State Street Corp1,039,125$1.10M0.00%+46,937+4.7%Added
Renaissance Technologies LLC962,959$1.02M0.00%+368,659+62.0%Added
Morgan Stanley939,827$996.2K0.00%−59,844−6.0%Reduced
PFM Health Sciences, LP787,914$835.2K0.06%00.0%Unchanged
Acadian Asset Management LLC751,292$795.0K0.00%+145,480+24.0%Added
Northern Trust Corp403,067$427.3K0.00%+11,247+2.9%Added
Dimensional Fund Advisors LP396,237$420.0K0.00%−44,880−10.2%Reduced
Charles Schwab Investment Management Inc367,026$389.0K0.00%−56,273−13.3%Reduced
D. E. Shaw & Co., Inc.344,922$365.6K0.00%−143,227−29.3%Reduced
TD Asset Management Inc340,686$361.1K0.00%00.0%Unchanged
Jacobs Levy Equity Management, Inc311,535$330.2K0.00%+38,090+13.9%Added
JPMorgan Chase & Co297,705$315.6K0.00%+127,513+74.9%Added
Bridgeway Capital Management, LLC246,800$261.6K0.01%−77,200−23.8%Reduced
Los Angeles Capital Management LLC245,927$260.7K0.00%−49,800−16.8%Reduced
Two Sigma Advisers, LP194,400$206.1K0.00%−22,700−10.5%Reduced
Yiheng Capital Management, L.P.191,530$203.0K0.04%00.0%Unchanged
Deutsche Bank AG184,173$195.2K0.00%+160,822+688.7%Added
Nuveen Asset Management, LLC169,265$179.4K0.00%00.0%Unchanged
Palo Alto Investors LP150,475$159.5K0.02%00.0%Unchanged
Manufacturers Life Insurance Company, The145,094$153.8K0.00%−18,884−11.5%Reduced
Bank of New York Mellon Corp139,913$148.3K0.00%−11,474−7.6%Reduced
Two Sigma Investments, LP120,403$127.6K0.00%−29,496−19.7%Reduced
Citadel Advisors LLC100,305$106.3K0.00%+100,305New
Millennium Management LLC91,578$97.1K0.00%+91,578New
Aegis Wealth Management LLC88,890$94.2K0.06%+88,890New
Panagora Asset Management Inc87,644$92.9K0.00%+116+0.1%Added
Barclays PLC85,900$91.1K0.00%+9,470+12.4%Added
Rhumbline Advisers73,445$77.8K0.00%−2,174−2.9%Reduced
Integrated Wealth Concepts LLC72,720$77.1K0.00%+72,720New
Alliancebernstein L.P.72,155$76.5K0.00%00.0%Unchanged
Squarepoint Ops LLC65,628$69.6K0.00%+65,628New
Connor, Clark & Lunn Investment Management Ltd.63,559$67.4K0.00%−10,159−13.8%Reduced
Prudential Financial Inc50,975$54.0K0.00%00.0%Unchanged
Citigroup Inc41,477$44.0K0.00%+4,361+11.7%Added
Wells Fargo & Company32,841$34.8K0.00%+5,788+21.4%Added
Mirae Asset Global ETFs Holdings Ltd.28,709$30.4K0.00%+1,216+4.4%Added
SG Americas Securities, LLC27,097$29.0K0.00%+10,030+58.8%Added
Corebridge Financial, Inc.24,598$26.1K0.00%−1,857−7.0%Reduced
Intech Investment Management LLC23,337$24.7K0.00%+23,337New
Susquehanna International Group, LLP22,788$24.2K0.00%+22,788New
BNP Paribas Arbitrage, SA18,488$19.6K0.00%+18,488New
Police & Firemen's Retirement System of New Jersey15,793$16.7K0.00%+15,793New
PFG Advisors15,000$15.9K0.00%00.0%Unchanged
Invesco Ltd.14,362$15.2K0.00%+1,949+15.7%Added
Envestnet Asset Management Inc14,104$14.9K0.00%+14,104New
ProShare Advisors LLC13,934$14.8K0.00%+13,934New
Voya Investment Management LLC11,691$12.4K0.00%−5,510−32.0%Reduced
Tower Research Capital LLC (TRC)10,300$10.9K0.00%+6,553+174.9%Added
Royal Bank of Canada7,987$9.00K0.00%−3,848−32.5%Reduced
Russell Investments Group, Ltd.5,815$6.16K0.00%+754+14.9%Added
Legal & General Group Plc3,919$4.15K0.00%00.0%Unchanged
Sterling Capital Management LLC3,629$3.85K0.00%+1,523+72.3%Added
California State Teachers Retirement System3,585$3.80K0.00%00.0%Unchanged
Public Employees Retirement System of Ohio3,534$3.75K0.00%−2,107−37.4%Reduced
Ameritas Investment Partners, Inc.3,277$3.47K0.00%00.0%Unchanged
New York State Common Retirement Fund2,682$2.84K0.00%00.0%Unchanged
Amalgamated Bank1,526$2.00K0.00%00.0%Unchanged
SBI Securities Co., Ltd.470$4980.00%+470New
CoreCap Advisors, LLC415$4400.00%+415New
Nisa Investment Advisors, LLC302$3200.00%+214+243.2%Added
Advisor Group Holdings, Inc.107$1130.00%00.0%Unchanged
Assetmark, Inc100$1060.00%+100New
EverSource Wealth Advisors, LLC75$800.00%+75New
The PNC Financial Services Group, Inc.53$560.00%00.0%Unchanged
First Horizon Advisors, Inc.2$20.00%00.0%Unchanged
Huntington National Bank1$10.00%00.0%Unchanged
CWM, LLC303$00.00%+257+558.7%Added
Bellevue Group AG0$00.00%−3,918,856−100.0%Sold out
Kestra Private Wealth Services, LLC0$00.00%−42,000−100.0%Sold out
Jane Street Group, LLC0$00.00%−34,783−100.0%Sold out
American Century Companies Inc0$00.00%−31,316−100.0%Sold out
Cornercap Investment Counsel Inc0$00.00%−28,995−100.0%Sold out
XTX Topco Ltd0$00.00%−17,922−100.0%Sold out
Ameriprise Financial Inc0$00.00%−14,274−100.0%Sold out
MetLife Investment Management0$00.00%−4,304−100.0%Sold out
Fortitude Family Office, LLC0$00.00%−3,351−100.0%Sold out
GAMMA Investing LLC0$00.00%−50−100.0%Sold out
Capital Performance Advisors LLP0$00.00%−45−100.0%Sold out
SRS Capital Advisors, Inc.0$00.00%−38−100.0%Sold out
Capital Advisors, Ltd. LLC0$00.00%−29−100.0%Sold out