FANG

SEC source: 0001539838-26-000174 · wk-form4_1791407877.xml · nonDerivative · entry 3

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 759,864

F1 · shares: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Mr. Meloy on March 17, 2026.

F5 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $184.66 per share to $185.505 per share, inclusive.

F3 · ownership.direct: 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 · ownership.nature: 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.

SEC source: 0001539838-26-000174 · wk-form4_1791407877.xml · nonDerivative · entry 2

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 766,218

F1 · shares: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Mr. Meloy on March 17, 2026.

F4 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $183.65 per share to $184.58 per share, inclusive.

F3 · ownership.direct: 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 · ownership.nature: 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.

SEC source: 0001539838-26-000174 · wk-form4_1791407877.xml · nonDerivative · entry 1

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 772,694

F1 · shares: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Mr. Meloy on March 17, 2026.

F2 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $182.645 per share to $183.64 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 and 5.

F3 · ownership.direct: 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 · ownership.nature: 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.

SEC source: 0001140361-26-037010 · form4.xml · nonDerivative · entry 1

SGF FANG Holdings, LP · CIK 0002080063 · 10% owner

Greth Lyndal · CIK 0002021141 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 64,957,047

F1 · kind: On September 16, 2026, SGF FANG Holdings, LP, a Delaware limited partnership, sold 9,079,675 shares of common stock of Diamondback Energy, Inc., par value $0.01 per share, pursuant to Rule 144 under the Securities Act of 1933, as amended.

SEC source: 0001140361-26-037009 · form4.xml · nonDerivative · entry 1

SGF FANG Holdings, LP · CIK 0002080063 · 10% owner

Greth Lyndal · CIK 0002021141 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 64,957,047

F1 · kind: On September 16, 2026, SGF FANG Holdings, LP, a Delaware limited partnership, sold 9,079,675 shares of common stock of Diamondback Energy, Inc., par value $0.01 per share, pursuant to Rule 144 under the Securities Act of 1933, as amended.

SEC source: 0001539838-26-000164 · wk-form4_1789675419.xml · nonDerivative · entry 6

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,257

F4 · shares: On September 16, 2026, all of the issuer's securities held by the Katy Evans Meloy 2011 Trust and the Grady Allen Meloy 2011 Trust were gifted to a community property account held by Mr. Meloy and his spouse.

SEC source: 0001539838-26-000164 · wk-form4_1789675419.xml · nonDerivative · entry 5

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Grady Allen Meloy 2011 Trust

Disclosed balance after: 0

F4 · shares: On September 16, 2026, all of the issuer's securities held by the Katy Evans Meloy 2011 Trust and the Grady Allen Meloy 2011 Trust were gifted to a community property account held by Mr. Meloy and his spouse.

F3 · ownership.direct: Mr. Meloy is a trustee of each of the Katy Evans Meloy 2011 Trust and the Grady Allen Meloy 2011 Trust.

F3 · ownership.nature: Mr. Meloy is a trustee of each of the Katy Evans Meloy 2011 Trust and the Grady Allen Meloy 2011 Trust.

SEC source: 0001539838-26-000164 · wk-form4_1789675419.xml · nonDerivative · entry 4

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Katy Evans Meloy 2011 Trust

Disclosed balance after: 0

F4 · shares: On September 16, 2026, all of the issuer's securities held by the Katy Evans Meloy 2011 Trust and the Grady Allen Meloy 2011 Trust were gifted to a community property account held by Mr. Meloy and his spouse.

F3 · ownership.direct: Mr. Meloy is a trustee of each of the Katy Evans Meloy 2011 Trust and the Grady Allen Meloy 2011 Trust.

F3 · ownership.nature: Mr. Meloy is a trustee of each of the Katy Evans Meloy 2011 Trust and the Grady Allen Meloy 2011 Trust.

SEC source: 0001539838-26-000164 · wk-form4_1789675419.xml · nonDerivative · entry 3

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Grady Allen Meloy 2011 Trust

Disclosed balance after: 12,500

F1 · shares: On September 15, 2026, 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, gifted 12,500 shares to the Katy Evans Meloy 2011 Trust and 12,500 shares to the Grady Allen Meloy 2011 Trust.

F3 · ownership.direct: Mr. Meloy is a trustee of each of the Katy Evans Meloy 2011 Trust and the Grady Allen Meloy 2011 Trust.

F3 · ownership.nature: Mr. Meloy is a trustee of each of the Katy Evans Meloy 2011 Trust and the Grady Allen Meloy 2011 Trust.

SEC source: 0001539838-26-000164 · wk-form4_1789675419.xml · nonDerivative · entry 2

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Katy Evans Meloy 2011 Trust

Disclosed balance after: 12,500

F1 · shares: On September 15, 2026, 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, gifted 12,500 shares to the Katy Evans Meloy 2011 Trust and 12,500 shares to the Grady Allen Meloy 2011 Trust.

F3 · ownership.direct: Mr. Meloy is a trustee of each of the Katy Evans Meloy 2011 Trust and the Grady Allen Meloy 2011 Trust.

F3 · ownership.nature: Mr. Meloy is a trustee of each of the Katy Evans Meloy 2011 Trust and the Grady Allen Meloy 2011 Trust.

SEC source: 0001539838-26-000164 · wk-form4_1789675419.xml · nonDerivative · entry 1

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 793,197

F1 · shares: On September 15, 2026, 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, gifted 12,500 shares to the Katy Evans Meloy 2011 Trust and 12,500 shares to the Grady Allen Meloy 2011 Trust.

F2 · ownership.direct: 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.

F2 · ownership.nature: 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.

SEC source: 0001539838-26-000165 · wk-form4_1789675425.xml · nonDerivative · entry 1

Dick Teresa L. · CIK 0001559931 · EVP Accounting, Assist. Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75,755

SEC source: 0001539838-26-000166 · wk-form4_1789675430.xml · nonDerivative · entry 1

Zmigrosky Matt · CIK 0001767328 · EVP, Chief Legal and Admin Off

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,705

SEC source: 0001539838-26-000160 · wk-form4_1789416421.xml · nonDerivative · entry 1

Stice Travis D. · CIK 0001559933 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,727

F1 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $203.77 per share to $204.715 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.

SEC source: 0001539838-26-000159 · wk-form4_1789416341.xml · nonDerivative · entry 1

Zmigrosky Matt · CIK 0001767328 · EVP, Chief Legal and Admin Off

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,031

F1 · shares: The issuer withheld shares of common stock that would have otherwise been issuable to the reporting person to satisfy the issuer's tax withholding obligations in connection with the vesting and settlement on September 10, 2026 of the second tranche of the time-based restricted stock units granted to the reporting person on September 10, 2024. The number of shares of common stock withheld was determined based on the closing price per share of the issuer's common stock on September 9, 2026.

SEC source: 0001539838-26-000158 · wk-form4_1789416216.xml · nonDerivative · entry 1

Barkmann Albert · CIK 0002012976 · Exec. VP and Chief Engineer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,889

F1 · shares: The issuer withheld shares of common stock that would have otherwise been issuable to the reporting person to satisfy the issuer's tax withholding obligations in connection with the vesting and settlement on September 10, 2026 of the second tranche of the time-based restricted stock units granted to the reporting person on September 10, 2024. The number of shares of common stock withheld was determined based on the closing price per share of the issuer's common stock on September 9, 2026.

SEC source: 0001539838-26-000152 · wk-form4_1787601691.xml · nonDerivative · entry 1

Plaumann Mark Lawrence · CIK 0001290795 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,437

SEC source: 0001539838-26-000153 · wk-form4_1787601697.xml · nonDerivative · entry 1

Wesson Daniel N · CIK 0001805429 · Exec. VP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 70,789

F1 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $214.905 per share to $215.49 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.

SEC source: 0001539838-26-000154 · wk-form4_1787601703.xml · nonDerivative · entry 2

Van't Hof Matthew Kaes · CIK 0001704666 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 115,940

F2 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $215.045 per share to $215.07 per share, inclusive.

SEC source: 0001539838-26-000154 · wk-form4_1787601703.xml · nonDerivative · entry 1

Van't Hof Matthew Kaes · CIK 0001704666 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 116,440

F1 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $214.015 per share to $215.01 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 footnote 2.

SEC source: 0001539838-26-000147 · wk-form4_1786996919.xml · nonDerivative · entry 1

Thompson Jere W III · CIK 0002012978 · CFO, Executive VP

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,475

SEC source: 0001539838-26-000148 · wk-form4_1786996926.xml · nonDerivative · entry 1

Zmigrosky Matt · CIK 0001767328 · EVP, Chief Legal and Admin Off

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,892

F1 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $202.6701 per share to $202.89 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.

SEC source: 0001539838-26-000144 · wk-form4_1786564885.xml · nonDerivative · entry 1

Van't Hof Matthew Kaes · CIK 0001704666 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 125,940

F1 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $202.325 per share to $202.625 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.

SEC source: 0001539838-26-000139 · wk-form4_1785873669.xml · nonDerivative · entry 4

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 818,197

F1 · shares: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Mr. Meloy on March 17, 2026.

F6 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $199.3825 per share to $199.495 per share, inclusive.

F3 · ownership.direct: 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 · ownership.nature: 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.

SEC source: 0001539838-26-000139 · wk-form4_1785873669.xml · nonDerivative · entry 3

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 820,927

F1 · shares: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Mr. Meloy on March 17, 2026.

F5 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $198.36 per share to $199.36 per share, inclusive.

F3 · ownership.direct: 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 · ownership.nature: 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.

SEC source: 0001539838-26-000139 · wk-form4_1785873669.xml · nonDerivative · entry 2

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 839,982

F1 · shares: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Mr. Meloy on March 17, 2026.

F4 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $197.35 per share to $198.35 per share, inclusive.

F3 · ownership.direct: 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 · ownership.nature: 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.

SEC source: 0001539838-26-000139 · wk-form4_1785873669.xml · nonDerivative · entry 1

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 847,544

F1 · shares: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Mr. Meloy on March 17, 2026.

F2 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $196.34 per share to $197.34 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 6.

F3 · ownership.direct: 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 · ownership.nature: 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.

SEC source: 0001539838-26-000131 · wk-form4_1781812893.xml · nonDerivative · entry 1

Van't Hof Matthew Kaes · CIK 0001704666 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 130,940

SEC source: 0001333454-26-000003 · wk-form4_1781727477.xml · nonDerivative · entry 3

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 851,530

F1 · shares: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Mr. Meloy on March 17, 2026.

F5 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $187.61 per share to $187.80 per share, inclusive.

F3 · ownership.direct: 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 · ownership.nature: 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.

SEC source: 0001333454-26-000003 · wk-form4_1781727477.xml · nonDerivative · entry 2

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 855,579

F1 · shares: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Mr. Meloy on March 17, 2026.

F4 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $186.605 per share to $187.59 per share, inclusive.

F3 · ownership.direct: 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 · ownership.nature: 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.

SEC source: 0001333454-26-000003 · wk-form4_1781727477.xml · nonDerivative · entry 1

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 920,326

F1 · shares: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Mr. Meloy on March 17, 2026.

F2 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $185.60 per share to $186.60 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 and 5.

F3 · ownership.direct: 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 · ownership.nature: 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.

SEC source: 0001539838-26-000128 · wk-form4_1781122116.xml · nonDerivative · entry 1

Plaumann Mark Lawrence · CIK 0001290795 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,437

SEC source: 0001140361-26-024262 · form4.xml · nonDerivative · entry 1

SGF FANG Holdings, LP · CIK 0002080063 · 10% owner

Greth Lyndal · CIK 0002021141 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 74,036,722

F1 · kind: On June 4, 2026, SGF FANG Holdings, LP, a Delaware limited partnership, sold 10,000,000 shares of common stock of Diamondback Energy, Inc., par value $0.01 per share, pursuant to Rule 144 under the Securities Act of 1933, as amended.

SEC source: 0001539838-26-000126 · wk-form4_1780948883.xml · nonDerivative · entry 1

Dick Teresa L. · CIK 0001559931 · CAO, Exec. VP, Assist. Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 80,755

SEC source: 0001539838-26-000124 · wk-form4_1780603390.xml · nonDerivative · entry 2

Van't Hof Matthew Kaes · CIK 0001704666 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 133,614

SEC source: 0001539838-26-000124 · wk-form4_1780603390.xml · nonDerivative · entry 1

Van't Hof Matthew Kaes · CIK 0001704666 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 143,614

SEC source: 0001539838-26-000123 · wk-form4_1780603383.xml · nonDerivative · entry 1

Zmigrosky Matt · CIK 0001767328 · EVP, Chief Legal and Admin Off

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,392

SEC source: 0001539838-26-000120 · wk-form4_1780432768.xml · nonDerivative · entry 1

Dick Teresa L. · CIK 0001559931 · CAO, Exec. VP, Assist. Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 85,755

SEC source: 0001539838-26-000119 · wk-form4_1780432760.xml · nonDerivative · entry 1

Zmigrosky Matt · CIK 0001767328 · EVP, Chief Legal and Admin Off

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,392

SEC source: 0001539838-26-000107 · wk-form4_1779400620.xml · nonDerivative · entry 1

Brooks Vincent K · CIK 0001809046 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · VKB Solutions, LLC

Disclosed balance after: 11,635

F1 · shares: 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 General Brooks 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.

F2 · ownership.nature: These shares have been assigned by General Brooks to VKB Solutions LLC of which he is the sole member.

SEC source: 0001539838-26-000115 · wk-form4_1779400682.xml · nonDerivative · entry 1

KLEIN REBECCA A · CIK 0001488085 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,129

F1 · shares: 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. Klein 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.

SEC source: 0001539838-26-000110 · wk-form4_1779400643.xml · nonDerivative · entry 1

Plaumann Mark Lawrence · CIK 0001290795 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,937

F1 · shares: 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 Mr. Plaumann 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.

F2 · balance_after: Reflects the transfer of 7,688 shares of Common Stock in a transaction exempt from reporting pursuant to Rule 16a-13.

SEC source: 0001539838-26-000112 · wk-form4_1779400656.xml · nonDerivative · entry 1

HOLDERNESS DARIN G · CIK 0001187965 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,798

F1 · shares: 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 Mr. Holderness 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.

SEC source: 0001539838-26-000111 · wk-form4_1779400650.xml · nonDerivative · entry 1

WEST STEVEN E · CIK 0001190898 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,466

F1 · shares: 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 Mr. West 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.

SEC source: 0001539838-26-000105 · wk-form4_1779400609.xml · nonDerivative · entry 1

REEVES ROBERT K · CIK 0001188140 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,066

F1 · shares: 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 Mr. Reeves 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.

SEC source: 0001539838-26-000109 · wk-form4_1779400634.xml · nonDerivative · entry 1

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,257

F1 · shares: 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 Mr. Meloy 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.

SEC source: 0001539838-26-000116 · wk-form4_1779400690.xml · nonDerivative · entry 1

Trent Melanie Montague · CIK 0001343137 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,039

F1 · shares: 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. Trent 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.

SEC source: 0001539838-26-000114 · wk-form4_1779400673.xml · nonDerivative · entry 1

Mains Stephanie K. · CIK 0001766980 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,635

F1 · shares: 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.

SEC source: 0001539838-26-000113 · wk-form4_1779400665.xml · nonDerivative · entry 1

Stice Travis D. · CIK 0001559933 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 124,727

F1 · shares: 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 Mr. Stice 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.

SEC source: 0001539838-26-000106 · wk-form4_1779400614.xml · nonDerivative · entry 1

Tsuru Frank D. · CIK 0001936468 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,129

F1 · shares: 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 Mr. Tsuru 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.