On January 20, 2023, the board of directors of ProPetro Holding Corp. appointed Mary P. Ricciardello as a Director and as a Member of the Nominating and Corporate Governance Committee and the Audit Committee of the Board in connection with an increase in Board size. Ms. Ricciardello's term as director will expire at the 2023 annual meeting of stockholders or until her successor is elected and qualified or her earlier death, resignation or removal.

The Board determined that Ms. Ricciardello meets the independence requirements under the rules of the New York Stock Exchange and Rule 10A-3 of the Securities Exchange Act of 1934, as amended, that she is an “audit committee financial expert,” as defined in Item 407(d) of Regulation S-K, and that there are no transactions between the Company.