X0609 4 2026-09-11 0 0001539838 Diamondback Energy, Inc. FANG 0001559933 Stice Travis D. false 500 WEST TEXAS AVENUE SUITE 100 MIDLAND TX 79701 1 0 0 0 0 Common Stock 2026-09-11 4 S 0 75000 204.3103 D 49727 D Common Stock 305314 I By Stice Investments, Ltd. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $203.77 per share to $204.715 per share, inclusive. The reporting person undertakes to provide to Diamondback Energy, Inc., any security holder of Diamondback Energy, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. These securities are held by Stice Investments, Ltd., which is managed by Stice Management, LLC, its general partner. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager. /s/ Matt Zmigrosky, as attorney-in-fact for Travis D. Stice 2026-09-14