Generation Bio (GBIO) Proxy Filing summary

Executive summary

• Annual meeting scheduled for June 4, 2025, with virtual attendance available for shareholders.

• Shareholders are encouraged to review proxy materials and vote by June 3, 2025.

Voting matters and shareholder proposals

• Election of three Class II directors to serve until the 2028 annual meeting: Ron Cooper, Anthony Quinn, and Jason Rhodes.

• Ratification of Ernst & Young LLP as independent registered public accounting firm for fiscal year ending December 31, 2025.

• Advisory vote on executive compensation for named executive officers.

• Proposal to amend the restated certificate of incorporation to effect a reverse stock split at a ratio between 1-for-10 and 1-for-30, with the board determining the exact ratio and timing.

• Proxyholders authorized to vote on other business that may arise at the meeting.

Board of directors and corporate governance

• Board recommends voting in favor of all proposals, including director nominees and the reverse stock split.