On October 23, 2020, Darin G. Holderness was appointed as the Special Advisor to the Chief Financial Officer and will no longer serve as the Chief Financial Officer or an executive officer of ProPetro Holding Corp. Effective as of October 23, 2020, the company and Mr. Holderness entered into a separation agreement and release (the Holderness Separation Agreement") memorializing the terms of his revised role and related matters and pursuant to which Mr. Holderness expects to resign as an employee on October 30, 2020, or such earlier date as either Mr. Holderness or the Company may elect.