Recent Corporate Updates

Reduction in Force and Executive Departures: In June 2026, enGene implemented a plan to reduce its workforce by approximately 50% to streamline operations and preserve cash. The Company has retained personnel and resources required to meet its key strategic goals and milestones, including completion of LEGEND Cohort 1; enrolling the detalimogene plus surfactant cohort; meeting with the FDA and planning for BLA initiation in 2H 2026; and completing necessary pre-commercial activities required to support the planned commercial launch ofdetalimogene in 2027.

In conjunction with its reduction in force, the following executive officers will depart from the Company, effective July 15, 2026: Ryan Daws, Chief Financial Officer, Lee Giguere, Chief Legal Officer and Alex Nichols, Chief Strategy and Operations Officer.

Anthony Cheung, Chief Scientific Officer, will continue in his role through September 30, 2026, after which, he will transition into a consulting arrangement.

Hussein Sweiti, M.D., Chief Medical Officer,stepped down from his position to pursue a new professional opportunity, effective June 14, 2026. Effective immediately, William Grossman, M.D., Ph.D., a member of enGene's Board of Directors, will act as interim Chief Medical Officer. He is the former Senior Vice President and Therapeutic Area Head of Oncology Clinical Development at Gilead Sciences Inc. where he oversaw the oncology portfolio (early and late-stage clinical development) and collaboration programs. Prior to that, he held several Chief Medical Officer roles including at Arcus Biosciences and Bellicum Pharmaceuticals. He has held additional leadership roles at Genentech/Roche, Merck, AbbVie, and Biothera. Dr. Grossman received his M.D. and Ph.D. in Immunology from Washington University School of Medicine's Medical Scientist Training Program and completed his medical and post-doctoral training in both the Divisions of Pediatrics and Medicine at Washington University School of Medicine. He also currently serves on several advisory boards and will continue to serve on enGene's Board of Directors as a non-independent Director during his interim CMO role.

Constantine Chinoporos, who joined the Company in May as a business development consultant, is expected to act as enGene's interim Chief Business Officer. Mr. Chinoporos brings deep experience across business development, licensing, and M&A in the biopharma sector. He is a member of the Board of Directors at Geron Corporation, and most recently served as Chief Operating Officer and Chief Business Officer of Applied Therapeutics. Prior to his role at Applied Therapeutics, Mr. Chinoporos served as Chief Business Officer at Albireo Pharmaceuticals, Inc. from 2021 until its acquisition by Ipsen S.A. in 2023. From 2015 to 2021, he served as Chief Business Officer at Boston Pharmaceuticals, Inc. Previously, he held senior positions in worldwide licensing, business development, corporate development, corporate finance and alliance management at Sanofi S.A., Genzyme Corporation, and Eli Lilly and Company. Mr. Chinoporos holds an M.B.A. from the Johnson Graduate School of Management at Cornell University and a B.A. in History from Cornell University.