Diamondback Energy, Inc. (FANG) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-05-20 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: Diamondback Energy, Inc. (FANG) CIK: 0001539838 --- Reporting Owner --- Name: Mains Stephanie K. CIK: 0001766980 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-05-20 | Code: A (Grant or award) Shares: +982 | Price: $0.00 Shares Owned After: 11,635 | Ownership: D (Direct) Footnotes: [F1] These securities are restricted stock units, each representing a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units were granted to Ms. Mains as an annual non-employee director grant under the issuer's equity incentive plan and will vest on the earlier of the one-year anniversary of the date of grant and the date of the 2027 annual meeting of stockholders of the issuer. --- Footnotes (Complete Index) --- F1: These securities are restricted stock units, each representing a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units were granted to Ms. Mains as an annual non-employee director grant under the issuer's equity incentive plan and will vest on the earlier of the one-year anniversary of the date of grant and the date of the 2027 annual meeting of stockholders of the issuer. --- Signature --- /s/ /s/ Matt Zmigrosky, as attorney-in-fact for Stephanie K. Mains (2026-05-21)