On February 19, 2021, Kimon Angelides resigned as a member of the Board of Directors of Petra Acquisition, Inc. To fill the vacancy on the Audit Committee of the Board created by Mr. Angelides' resignation, the Board appointed Anthony Hayes, a current independent Board member, to serve as a member of the Committee. Effective February 22, 2021, the corporate governance and nominating committee recommended, and the board of directors approved, the appointment of William H. Carson to fill the vacancy resulting from the resignation of Mr. Angelides.