Generation BioGBIO
13F holders, Q1 2025 (March 31)81holders +1
9new positions
8sold out
3famous investors
$0.41avg. 13F price*
At the end of Q1 2025, 81 institutions reported holding Generation Bio Co. (GBIO) in their 13F filings, up 1 from Q4 2024. 9 opened new positions and 8 sold out. The largest holders were T. Rowe Price Associates Inc. ($3.7M), Atlas Venture Life Science Advisors, LLC ($3.4M) and FMR LLC ($1.9M). 3 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio), Ken Griffin (0.0% of Citadel Advisors's portfolio) and Cliff Asness (0.0% of AQR Capital Management's portfolio).
- Company
- Generation Bio Co.
- CUSIP
- 37148K100
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2024 → Q1 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 9 | $151K |
| Exits | 8 | $3.6M |
All 13F filers, Q4 2024 → Q1 2025: 2,476,108 shares bought and 8,622,874 shares sold, net −6,146,766 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 81 holders
| T. Rowe Price Associates Inc. | 0.00% | Reduce -2.3% | 9,061,839 | $3.7M |
| Atlas Venture Life Science Advisors, LLC | 0.64% | No change | 8,279,484 | $3.4M |
| FMR LLC | 0.00% | Add +2.7% | 4,752,415 | $1.9M |
| BlackRock, Inc. | 0.00% | Reduce -1.6% | 3,405,178 | $1.4M |
| Siren, L.L.C. | 0.07% | Reduce -0.5% | 2,968,925 | $1.2M |
| Vanguard Group Inc. | 0.00% | Reduce -0.8% | 2,619,709 | $1.1M |
| Baker Bros. Advisors LP | 0.01% | No change | 1,944,945 | $788K |
| Renaissance Technologies | 0.00% | Add +95.3% | 1,880,670 | $762K |
| Bank of America Corp. | 0.00% | Reduce -57.1% | 1,287,186 | $521K |
| Acadian Asset Management LLC | 0.00% | Add +54.3% | 1,159,135 | $468K |
| Geode Capital Management, LLC | 0.00% | Reduce -2.5% | 1,108,422 | $449K |
| Goldman Sachs Group Inc. | 0.00% | Reduce -10.1% | 1,086,098 | $440K |
| State Street Corp. | 0.00% | Reduce -3.2% | 1,005,742 | $407K |
| UBS Group AG | 0.00% | Reduce -7.2% | 977,349 | $396K |
| Morgan Stanley | 0.00% | Reduce -6.5% | 878,936 | $356K |
| Squarepoint Ops LLC | 0.00% | Add +569.4% | 439,313 | $178K |
| Los Angeles Capital Management LLC | 0.00% | Add +54.1% | 378,914 | $153K |
| Northern Trust Corp. | 0.00% | Reduce -8.2% | 369,907 | $150K |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -2.9% | 356,441 | $144K |
| TD Asset Management Inc | 0.00% | No change | 340,686 | $138K |
| JPMorgan Chase & Co. | 0.00% | Reduce -32.2% | 201,959 | $82K |
| Two Sigma Advisers, LP | 0.00% | Reduce -0.2% | 194,000 | $79K |
| Dimensional Fund Advisors LP | 0.00% | Reduce -51.6% | 191,830 | $78K |
| Yiheng Capital Management, L.P. | 0.03% | No change | 191,530 | $78K |
| Jacobs Levy Equity Management, Inc. | 0.00% | Reduce -41.6% | 182,005 | $74K |
| Jefferies Financial Group Inc. | 0.00% | Reduce -92.3% | 173,659 | $70K |
| Nuveen, LLC | 0.00% | — | 169,265 | $69K |
| Palo Alto Investors LP | 0.01% | No change | 150,475 | $61K |
| Manufacturers Life Insurance Company, The | 0.00% | Reduce -0.8% | 143,980 | $58K |
| Bank of New York Mellon Corp | 0.00% | Reduce -0.1% | 139,783 | $57K |
| Citadel Advisors | 0.00% | Add +21.0% | 121,355 | $49K |
| Deutsche Bank AG | 0.00% | Reduce -40.9% | 108,771 | $45K |
| Two Sigma Investments, LP | 0.00% | Reduce -12.3% | 105,548 | $43K |
| Ewa, LLC | 0.01% | New | 92,901 | $38K |
| Susquehanna International Group, LLP | 0.00% | Add +304.8% | 92,248 | $37K |
| AQR Capital Management | 0.00% | New | 89,014 | $36K |
| Aegis Wealth Management LLC | 0.02% | No change | 88,890 | $36K |
| Panagora Asset Management Inc. | 0.00% | Reduce -1.4% | 86,373 | $35K |
| Integrated Wealth Concepts LLC | 0.00% | No change | 72,720 | $29K |
| Alliancebernstein L.P. | 0.00% | No change | 72,155 | $29K |
| Rhumbline Advisers | 0.00% | Reduce -5.0% | 69,754 | $28K |
| Barclays PLC | 0.00% | Reduce -28.8% | 61,151 | $25K |
| Bridgeway Capital Management, LLC | 0.00% | Reduce -77.6% | 55,200 | $22K |
| XTX Topco Ltd | 0.00% | New | 52,440 | $21K |
| Kestra Private Wealth Services, LLC | 0.00% | New | 52,000 | $21K |
| Jane Street Group, LLC | 0.00% | New | 38,723 | $16K |
| Intech Investment Management LLC | 0.00% | Add +62.6% | 37,954 | $15K |
| Prudential Financial Inc. | 0.00% | Reduce -30.2% | 35,575 | $14K |
| Citigroup Inc. | 0.00% | Reduce -16.1% | 34,787 | $14K |
| Wells Fargo & Company | 0.00% | Reduce -8.1% | 30,197 | $12K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Add +4.3% | 29,957 | $12K |
| Corebridge Financial, Inc. | 0.00% | Reduce -1.5% | 24,239 | $10K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +103.0% | 20,910 | $8K |
| Ieq Capital, LLC | 0.00% | New | 20,439 | $8K |
| SG Americas Securities, LLC | 0.00% | Reduce -32.8% | 18,209 | $7K |
| Cerity Partners LLC | 0.00% | New | 16,852 | $7K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | No change | 15,793 | $6K |
| Osaic Holdings, Inc. | 0.00% | Add +14347.7% | 15,459 | $6K |
| PFG Advisors | 0.00% | No change | 15,000 | $6K |
| BNP Paribas Financial Markets | 0.00% | Reduce -19.3% | 14,917 | $6K |
| Invesco Ltd. | 0.00% | Reduce -5.8% | 13,536 | $5K |
| Cibc World Markets Corp. | 0.00% | New | 10,979 | $4K |
| ProShare Advisors LLC | 0.00% | Reduce -23.1% | 10,711 | $4K |
| Cwm, LLC | 0.00% | Add +2656.4% | 8,352 | $3K |
| Royal Bank of Canada | 0.00% | Reduce -34.3% | 5,246 | $2K |
| Legal & General Group Plc | 0.00% | No change | 3,919 | $2K |
| California State Teachers Retirement System | 0.00% | No change | 3,585 | $1K |
| Public Employees Retirement System of Ohio | 0.00% | No change | 3,534 | $1K |
| Ameritas Investment Partners, Inc. | 0.00% | No change | 3,277 | $1K |
| Sterling Capital Management LLC | 0.00% | Reduce -22.8% | 2,803 | $1K |
| Russell Investments Group, Ltd. | 0.00% | Reduce -53.5% | 2,703 | $1K |
| New York State Common Retirement Fund | 0.00% | No change | 2,682 | $1K |
| Amalgamated Bank | 0.00% | No change | 1,526 | $1K |
| PNC Financial Services Group, Inc. | 0.00% | Add +3288.7% | 1,796 | $728 |
| Nisa Investment Advisors, LLC | 0.00% | Add +455.3% | 1,677 | $679 |
| CoreCap Advisors, LLC | 0.00% | Add +128.0% | 946 | $383 |
| SBI Securities Co., Ltd. | 0.00% | No change | 470 | $190 |
| True Wealth Design, LLC | 0.00% | New | 129 | $53 |
| EverSource Wealth Advisors, LLC | 0.00% | Reduce -64.0% | 27 | $11 |
| First Horizon Advisors, Inc. | 0.00% | No change | 2 | $1 |
| Huntington National Bank | 0.00% | No change | 1 | $0 |
"% of holder's portfolio" is GBIO's weight in each manager's 13F, not the share of Generation Bio Co. the manager owns.