On June 29, 2020, Donald J. Hayden, Jr., notified REGENXBIO Inc. (the ‘Company’) of his resignation from the Board of Directors of the Company (the ‘Board’), effective as of July 1, 2020. In accordance with the Company’s Restated Certificate of Incorporation and Amended and Restated Bylaws, the Board reduced the number of directors of the Company from nine to eight effective upon Mr. Hayden’s resignation. The Board appointed Allan M. Fox, a current member of the Board, as Chairman of the Board and appointed A.N. ‘Jerry’ Karabelas, Ph.D., a current member of the Board, as Lead Independent Director effective upon Mr. Hayden’s resignation.