Sec Form 3 Filing - Greth Lyndal @ Diamondback Energy, Inc. - 2024-09-10

FORM 3 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 Greth Lyndal 2. Issuer Name and Ticker or Trading Symbol Diamondback Energy, Inc. [ FANG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O KATTEN MUCHIN ROSENMAN LLP, 2121 N. PEARL STREET, SUITE 1100 3. Date of Earliest Transaction (MM/DD/YY) 09/10/2024 (Street) DALLAS, TX75201 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ 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 11,726,706 I See footnote ( 1 ) ( 5 ) Common Stock 1,172,670 I See footnote ( 2 ) ( 5 ) Common Stock 65,901,525 I See footnote ( 3 ) ( 5 ) Common Stock 36,098,477 I See footnote ( 4 ) ( 5 )

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 Greth Lyndal C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS, TX75201 X ACS Capital Management, LLC C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS, TX75201 X ACS Capital Holdings, LP C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS, TX75201 X Stephens Family Trust C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS, TX75201 X Stephens Family Trust #2 C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS, TX75201 X SFT Management, LLC C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS, TX75201 X SFT 1 Holdings, LLC C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS, TX75201 X SFT 2 Holdings, LLC C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS, TX75201 X Autry Stephens Management Trust C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS, TX75201 X Endeavor Manager, LLC C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS, TX75201 X Signatures /s/ Lyndal Stephens Greth ,Attorney-in-fact 09/13/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )By ACS Capital Holdings, LP. Lyndal Stephens Greth is the sole trustee of the Autry Stephens Management Trust dated March 20, 2018, as amended, and the sole manager of ACS Capital Management, LLC. ACS Capital Management, LLC is the general partner, and the Autry Stephens Management Trust is the sole limited partner of ACS Capital Holdings, LP. ( 2 )By Endeavor Manager, LLC. Lyndal Stephens Greth is the sole trustee of the Autry Stephens Management Trust dated March 20, 2018, as amended, and the sole manager of ACS Capital Management, LLC. ACS Capital Management, LLC is the general partner, and the Autry Stephens Management Trust is the sole limited partner of ACS Capital Holdings, LP. ACS Capital Holdings, LP is the sole member of Endeavor Manager, LLC. ( 3 )By SFT 1 Holdings, LLC. Lyndal Stephens Greth is the sole Investment Direction Adviser who may direct investment decisions of the Stephens Family Trust, a directed trust, a co-trustee of the Stephens Family Trust, and the sole member and manager of SFT Management, LLC. The Stephens Family Trust is the sole member of SFT 1 Holdings, LLC. SFT Management, LLC is the sole manager of SFT 1 Holdings, LLC. ( 4 )By SFT 2 Holdings, LLC. Lyndal Stephens Greth is the sole Investment Direction Adviser who may direct investment decisions of the Stephens Family Trust #2, a directed trust, a co-trustee of the Stephens Family Trust #2, and the sole member and manager of SFT Management, LLC. The Stephens Family Trust #2 is the sole member of SFT 2 Holdings, LLC. SFT Management, LLC is the sole manager of SFT 2 Holdings, LLC. ( 5 )Lyndal Stephens Greth may be deemed to beneficially own the shares of Company Common Stock beneficially owned by each of the Reporting Persons but disclaims beneficial ownership except to the extent of her pecuniary interest therein.

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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