GENERATION BIO CO

Historical 13F Holders

Symbol
GBIO
CUSIP
37148K209
All holders as of
Q4 2025
Type
Equity
Class
COM NEW
Reported Value, Excluding Options
Total Filings

13D/G Filers

Investors who own more than 5% of a class must file a Schedule 13D or 13G. Each filer's latest filing for 37148K209 since 12/18/2024, largest first.

Filer % of Class Filed
SymBiosis Capital Partners, LLC 13G/A 6.3% 11/14/2025
Event 9/30/2025
Under 5%, checked the "5 percent or less" box, or amended by a later filing (3)
Renaissance Technologies LLC 13G/A
4.3% 2/12/2026
Event 12/31/2025
Price T Rowe Associates Inc /MD/ 13G/A 3.1% 2/17/2026
Event 12/31/2025
Baselake Partners, LP 13G/A
0% 2/11/2026
Event 2/9/2026

13F Holders by Quarter

Period Filings Shares, Excl. Options Value, Excl. Options
2025 Q4 47 4.34 M $24.6 M
2025 Q3 37 3.11 M $19.0 M
2025 Q2 4 117 k $37.5 k