Sec Form 4 Filing - Zmigrosky Matt @ Diamondback Energy, Inc. - 2023-05-28

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Zmigrosky Matt 2. Issuer Name and Ticker or Trading Symbol Diamondback Energy, Inc. [ FANG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) EVP, Chief Legal and Admin Off (Last) (First) (Middle) 500 WEST TEXAS AVENUE, SUITE 100 3. Date of Earliest Transaction (MM/DD/YY) 05/28/2023 (Street) MIDLAND, TX79701 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 05/28/2023 F 204 ( 1 ) D $ 130.99 35,998 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Zmigrosky Matt 500 WEST TEXAS AVENUE, SUITE 100 MIDLAND, TX79701 EVP, Chief Legal and Admin Off Signatures /s/ Matt Zmigrosky 05/31/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )In connection with the issuer?s acquisition of all of the outstanding publicly-held common units of Rattler Midstream LP (?Rattler?) on August 24, 2022 (the ?Rattler Merger?), each Rattler phantom unit outstanding immediately prior to the effective time of the Rattler Merger under the Rattler Midstream LP Long-Term Incentive Plan was converted into the issuer?s restricted stock unit award, as adjusted based on the merger exchange ratio. In connection with the vesting and settlement on May 28, 2023 of the first of the two unvested tranches of the issuer?s restricted stock units received by the reporting person in connection with the Rattler Merger, the issuer withheld shares of its common stock that would have otherwise been issuable to the reporting person to satisfy tax withholding obligations. The number of shares of common stock withheld was determined based on the closing price per share of the issuer's common stock on May 26, 2023.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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