RENAISSANCE TECHNOLOGIES LLC - 31 Dec 2025 SCHEDULE 13G/A Report for Generation Bio Co. Common Stock, $0.0001 Par Value (GBIO)

Filing Manager
RENAISSANCE TECHNOLOGIES LLC
Reporting Manager
Renaissance Technologies LLC
Security
Generation Bio Co. Common Stock, $0.0001 Par Value
Symbol
GBIO
Shares outstanding
6,735,691 shares
Disclosed Ownership
287,614 shares
Ownership
4.3%
Form type
SCHEDULE 13G/A
Filing time
12 Feb 2026, 14:14:04 UTC
Date of event
31 Dec 2025
Previous filing
13 Nov 2025
SEC
View on sec.gov

Reporting Managers (2)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Renaissance Technologies LLC 4.3% 287,614 287,614 0 Brian Felczak Chief Financial Officer
Renaissance Technologies Holdings Corporation 4.3% 287,614 287,614 0 Brian Felczak Vice President