On March 24, 2021, Kellen O'Keefe notified Stable Road Acquisition Corp. (the Company) that he has elected to resign from the Board of Directors of the Company effective immediately. Mr. O'Keefe and the Board concluded that his services and expertise were no longer necessary in light of the Company's proposed business combination with Momentus Inc. In connection with Mr. O'Keefe's departure, Ann Kono has been appointed to serve as (i) a member and the chairperson of the Company's Compensation Committee and (ii) a member of the Company's Audit Committee.