Diamondback Energy (FANG) 4: Meloy Charles Alvin sold 842 shares of Common Stock at $187… (May 11, 2026)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-05-07 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: Diamondback Energy, Inc. (FANG) CIK: 0001539838 --- Reporting Owner --- Name: Meloy Charles Alvin CIK: 0001333454 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-05-07 | Code: S (Open market sale) Shares: -842 | Price: $187.35 Total Value: $157,749.37 Shares Owned After: 949,736 | Ownership: I (Indirect) | Nature: Wolfrock Energy, LLC Footnotes: [F1] 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. [F2] The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $186.725 per share to $187.72 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. [F3] 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. [F3] 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. [Transaction #2] Security: Common Stock Date: 2026-05-07 | Code: S (Open market sale) Shares: -1,636 | Price: $188.11 Total Value: $307,755.32 Shares Owned After: 948,100 | Ownership: I (Indirect) | Nature: Wolfrock Energy, LLC Footnotes: [F1] 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. [F4] The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $187.73 per share to $188.725 per share, inclusive. [F3] 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. [F3] 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. [Transaction #3] Security: Common Stock Date: 2026-05-07 | Code: S (Open market sale) Shares: -2,492 | Price: $189.44 Total Value: $472,080.74 Shares Owned After: 945,608 | Ownership: I (Indirect) | Nature: Wolfrock Energy, LLC Footnotes: [F1] 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. [F5] The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $188.75 per share to $189.75 per share, inclusive. [F3] 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. [F3] 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. [Transaction #4] Security: Common Stock Date: 2026-05-07 | Code: S (Open market sale) Shares: -2,887 | Price: $190.14 Total Value: $548,934.18 Shares Owned After: 942,721 | Ownership: I (Indirect) | Nature: Wolfrock Energy, LLC Footnotes: [F1] 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. [F6] The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $189.76 per share to $190.715 per share, inclusive. [F3] 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. [F3] 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. [Transaction #5] Security: Common Stock Date: 2026-05-08 | Code: S (Open market sale) Shares: -403 | Price: $187.54 Total Value: $75,576.85 Shares Owned After: 942,318 | Ownership: I (Indirect) | Nature: Wolfrock Energy, LLC Footnotes: [F1] 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. [F7] The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $187.18 per share to $188.165 per share, inclusive. [F3] 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. [F3] 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. [Transaction #6] Security: Common Stock Date: 2026-05-08 | Code: S (Open market sale) Shares: -3,545 | Price: $188.72 Total Value: $669,004.96 Shares Owned After: 938,773 | Ownership: I (Indirect) | Nature: Wolfrock Energy, LLC Footnotes: [F1] 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. [F8] The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $188.19 per share to $189.19 per share, inclusive. [F3] 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. [F3] 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. [Transaction #7] Security: Common Stock Date: 2026-05-08 | Code: S (Open market sale) Shares: -3,909 | Price: $189.56 Total Value: $740,996.29 Shares Owned After: 934,864 | Ownership: I (Indirect) | Nature: Wolfrock Energy, LLC Footnotes: [F1] 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. [F9] The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $189.195 per share to $190.195 per share, inclusive. [F3] 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. [F3] 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. --- Holdings --- [Holding #1] Security: Common Stock Ownership: D (Direct) --- Footnotes (Complete Index) --- F1: 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. F2: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $186.725 per share to $187.72 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. F3: 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. F4: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $187.73 per share to $188.725 per share, inclusive. F5: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $188.75 per share to $189.75 per share, inclusive. F6: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $189.76 per share to $190.715 per share, inclusive. F7: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $187.18 per share to $188.165 per share, inclusive. F8: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $188.19 per share to $189.19 per share, inclusive. F9: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $189.195 per share to $190.195 per share, inclusive. --- Signature --- /s/ /s/ Matt Zmigrosky, as attorney-in-fact for Charles A. Meloy (2026-05-11)