Generation BioGBIO
13F holders, Q3 2025 (September 30)6holders −53
0new positions
25sold out
$6.04avg. 13F price*
At the end of Q3 2025, 6 institutions reported holding Generation Bio Co. (GBIO) in their 13F filings, down 53 from Q2 2025. 0 opened new positions and 25 sold out. The largest holders were Atlas Venture Life Science Advisors, LLC ($5.1M), Palo Alto Investors LP ($92K) and Accent Capital Management, LLC ($23K).
- Company
- Generation Bio Co.
- CUSIP
- 37148K100
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 0 | $0 |
| Exits | 25 | $778K |
All 13F filers, Q2 2025 → Q3 2025: 9,999,383 shares sold, net −9,999,383 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 6 holders
| Atlas Venture Life Science Advisors, LLC | 0.67% | Reduce -90.0% | 827,946 | $5.1M |
| Palo Alto Investors LP | 0.02% | Reduce -90.0% | 15,047 | $92K |
| Accent Capital Management, LLC | 0.01% | No change | 38 | $23K |
| Osaic Holdings, Inc. | 0.00% | No change | 15,459 | $5K |
| Huntington National Bank | 0.00% | No change | 1 | $0 |
| Cwm, LLC | 0.00% | Reduce -99.9% | 4 | $0 |
"% of holder's portfolio" is GBIO's weight in each manager's 13F, not the share of Generation Bio Co. the manager owns.