X0609 4 2026-08-20 0 0001539838 Diamondback Energy, Inc. FANG 0001704666 Van't Hof Matthew Kaes false 500 WEST TEXAS AVENUE SUITE 100 MIDLAND TX 79701 1 1 0 0 Chief Executive Officer 0 Common Stock 2026-08-20 4 S 0 9500 214.64 D 116440 D Common Stock 2026-08-20 4 S 0 500 215.056 D 115940 D The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $214.015 per share to $215.01 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 and in footnote 2. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $215.045 per share to $215.07 per share, inclusive. /s/ Matt Zmigrosky, as attorney-in-fact for Matthew Kaes Van't Hof 2026-08-24