X0609 4 2026-04-06 0 0001539838 Diamondback Energy, Inc. FANG 0001333454 Meloy Charles Alvin false 500 WEST TEXAS AVENUE SUITE 100 MIDLAND TX 79701 1 0 0 0 1 Common Stock 2026-04-06 4 S 0 2316 193.3227 D 963976 I Wolfrock Energy, LLC Common Stock 2026-04-06 4 S 0 5356 194.1535 D 958620 I Wolfrock Energy, LLC Common Stock 2026-04-06 4 S 0 185 195.1757 D 958435 I Wolfrock Energy, LLC Common Stock 2026-04-07 4 S 0 1885 195.5504 D 956550 I Wolfrock Energy, LLC Common Stock 2026-04-07 4 S 0 2370 196.591 D 954180 I Wolfrock Energy, LLC Common Stock 2026-04-07 4 S 0 2348 197.8285 D 951832 I Wolfrock Energy, LLC Common Stock 2026-04-07 4 S 0 1254 198.4886 D 950578 I Wolfrock Energy, LLC Common Stock 2275 D The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Mr. Meloy on August 13, 2025. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $192.68 per share to $193.64 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 footnotes 4 through 9. These securities are held directly by Wolfrock Energy, LLC, a Texas limited liability company whose sole member is CS Ventures, Ltd. CS Ventures, Ltd. is controlled by its general partner, Meloy Management, LLC, which is controlled by the Reporting Person. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $193.72 per share to $194.695 per share, inclusive. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $195.00 per share to $195.48 per share, inclusive. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $195.18 per share to $196.14 per share, inclusive. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $196.19 per share to $197.185 per share, inclusive. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $197.19 per share to $198.18 per share, inclusive. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $198.19 per share to $199.11 per share, inclusive. /s/ Matt Zmigrosky, as attorney-in-fact for Charles A. Meloy 2026-04-08