Renaissance Technologies Llc - Jul 1, 2025 SCHEDULE 13G 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: 6.74M shares
Disclosed Ownership: 344K shares
Ownership: 5.11%
Form type: SCHEDULE 13G
Date filed: 11/13/2025, 02:28 PM
Date of event: Jul 1, 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	5.11%	344K	344K	0	Brian Felczak	Chief Financial Officer
Renaissance Technologies Holdings Corporation	5.11%	344K	344K	0	Brian Felczak	Vice President