Darin G. Holderness has served as a director of Diamondback since February 2025 and is a Certified Public Accountant with extensive energy-sector finance and accounting experience. He served as CFO of ProPetro Holding Corp. from 2019 to 2020 and as SVP, CFO and Treasurer of Concho Resources from 2008 to 2016. He began his career at KPMG and earned a Bachelor of Business Administration in Accounting from Boise State University.