RENAISSANCE TECHNOLOGIES LLC - 01 Jul 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: 6,737,045 shares
Disclosed Ownership: 344,263 shares
Ownership: 5.1%
Form type: SCHEDULE 13G
Filing time: 13 Nov 2025, 14:28:17 UTC
Date of event: 01 Jul 2025
Next filing: 12 Feb 2026
SEC: View on sec.gov

Reporting Managers (2)

Name	Ownership	Shares Owned	sole voting power	shared voting power	Signature	Title	CIK
Renaissance Technologies LLC	5.1%	344,263	344,263	0	Brian Felczak	Chief Financial Officer
Renaissance Technologies Holdings Corporation	5.1%	344,263	344,263	0	Brian Felczak	Vice President