FANG

SEC source: 0001539838-26-000029 · wk-form4_1772578299.xml · nonDerivative · entry 5

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 82,387

F6 · 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 March 1, 2026 of the second tranche of the time-based restricted stock units granted to the reporting person on March 1, 2025. The number of shares of common stock withheld was determined based on the closing price per share of the issuer's common stock on February 27, 2026.

SEC source: 0001539838-26-000029 · wk-form4_1772578299.xml · nonDerivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 83,357

F5 · 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 March 1, 2026 of the third tranche of the time-based restricted stock units granted to the reporting person on March 1, 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 February 27, 2026.

SEC source: 0001539838-26-000029 · wk-form4_1772578299.xml · nonDerivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 84,096

F4 · 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 of the performance-based restricted stock units granted on March 1, 2023 and vested as of December 31, 2025 following the certification by the issuer's compensation committee of the applicable performance conditions for such performance-based restricted stock unit awards settling on March 1, 2026. The number of shares of common stock withheld was determined based on the closing price per share of the issuer's common stock on February 27, 2025.

SEC source: 0001539838-26-000029 · wk-form4_1772578299.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 92,546

F3 · shares: These securities are performance-based restricted stock units for the performance period from January 1, 2023 to December 31, 2025 that were granted under the issuer's equity incentive plan on March 1, 2023. All of these performance-based restricted stock units vested as of December 31, 2025 following the certification by the issuer's compensation committee of the applicable performance conditions for such performance-based restricted stock unit awards settling on March 1, 2026.

SEC source: 0001539838-26-000029 · wk-form4_1772578299.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: 71,112

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 under the issuer's equity incentive plan and will vest in three equal installments beginning on March 1, 2026.

F2 · balance_after: The Reporting Person's previous Forms 4 incorrectly overstated the number of shares owned by a de minimis amount. The number of shares beneficially owned by the Reporting Person following the transactions reported herein has been updated accordingly.

SEC source: 0001140361-26-003884 · form4.xml · nonDerivative · entry 2

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: 97,686,727

F1 · kind: Pursuant to a letter agreement, dated November 28, 2025, by and between Diamondback Energy, Inc., a Delaware corporation (the "Company"), and SGF FANG Holdings, LP, a Delaware limited partnership ("SGF FANG"), SGF FANG sold 1,000,000 shares of common stock to the Company on February 3, 2026 at the February 3, 2026 closing price of the common stock on Nasdaq and an additional 1,000,000 shares of common stock to the Company on February 4, 2026 at the February 4, 2026 closing price of the common stock on Nasdaq. Mrs. Greth is the ultimate beneficial owner of the shares held of record by SGF FANG and indirectly controls SGF Capital, LLC, its general partner.

SEC source: 0001333454-26-000002 · wk-form4_1770238870.xml · nonDerivative · entry 4

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 982,006

F1 · shares: 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 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $162.00 per share to $162.885 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.

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: 0001333454-26-000002 · wk-form4_1770238870.xml · nonDerivative · entry 3

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 1,000,704

F1 · shares: 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 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $161.00 per share to $161.90 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.

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: 0001333454-26-000002 · wk-form4_1770238870.xml · nonDerivative · entry 2

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 1,006,301

F1 · shares: 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 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $160.00 per share to $160.99 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.

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: 0001140361-26-003884 · 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: 98,686,727

F1 · kind: Pursuant to a letter agreement, dated November 28, 2025, by and between Diamondback Energy, Inc., a Delaware corporation (the "Company"), and SGF FANG Holdings, LP, a Delaware limited partnership ("SGF FANG"), SGF FANG sold 1,000,000 shares of common stock to the Company on February 3, 2026 at the February 3, 2026 closing price of the common stock on Nasdaq and an additional 1,000,000 shares of common stock to the Company on February 4, 2026 at the February 4, 2026 closing price of the common stock on Nasdaq. Mrs. Greth is the ultimate beneficial owner of the shares held of record by SGF FANG and indirectly controls SGF Capital, LLC, its general partner.

SEC source: 0001333454-26-000002 · wk-form4_1770238870.xml · nonDerivative · entry 1

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 1,042,611

F1 · shares: 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 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $160.00 per share to $160.43 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.

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: 0001333454-25-000010 · wk-form4_1765400463.xml · nonDerivative · entry 1

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 1,044,811

F1 · shares: 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 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $160.07 per share to $160.19 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.

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: 0001333454-25-000007 · wk-form4_1765227690.xml · nonDerivative · entry 2

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 1,044,864

F3 · kind: Represents a transfer of limited partnership interests in CS Ventures Ltd., which is the sole member of Wolfrock Energy LLC, to trusts for the benefit of the Reporting Person's children. No shares of the Issuer's common stock were disposed of in connection with this transfer.

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: 0001333454-25-000007 · wk-form4_1765227690.xml · nonDerivative · entry 1

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 1,044,864

F1 · kind: Represents a transfer of limited partnership interests in CS Ventures Ltd., which is the sole member of Wolfrock Energy LLC, to trusts for the benefit of the Reporting Person's children for no consideration. No shares of the Issuer's common stock were disposed of in connection with this transfer.

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: 0001140361-25-044029 · 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: 99,686,727

F1 · kind: Pursuant to a letter agreement, dated November 28, 2025, by and between Diamondback Energy, Inc., a Delaware corporation (the "Company"), and SGF FANG Holdings, LP, a Delaware limited partnership ("SGF FANG"), SGF FANG sold 2,000,000 shares of common stock to the Company at the November 28, 2025 closing price of the common stock on Nasdaq. Mrs. Greth is the ultimate beneficial owner of the shares held of record by SGF FANG and indirectly controls SGF Capital, LLC, its general partner.

SEC source: 0001805429-25-000004 · wk-form4_1764622877.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 80,117

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 $149.2332 per share to $149.3150 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: 0001704666-25-000009 · wk-form4_1763672465.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: 118,253

SEC source: 0001559933-25-000006 · wk-form4_1763499676.xml · nonDerivative · entry 1

Stice Travis D. · CIK 0001559933 · Director · Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Indirect · By Stice Investments, Ltd.

Disclosed balance after: 369,271

F1 · shares: These securities are held by Stice Investments, Ltd., which is managed by Stice Management, LLC, its general partner. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.

F1 · ownership.direct: These securities are held by Stice Investments, Ltd., which is managed by Stice Management, LLC, its general partner. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.

F1 · ownership.nature: These securities are held by Stice Investments, Ltd., which is managed by Stice Management, LLC, its general partner. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.

SEC source: 0001767328-25-000008 · wk-form4_1763499669.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: 63,534

SEC source: 0001333454-25-000005 · wk-form4_1763067725.xml · nonDerivative · entry 1

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 1,044,864

F1 · ownership.direct: These securities are held directly by Wolfrock Energy, LLC, a Texas limited liability company whose sole member is CS Ventures, Ltd., of which Mr. Meloy and his spouse are the limited partners. CS Ventures, Ltd. is controlled by its general partner, CSV Management Trust, of which Mr. Meloy is the trustee.

F1 · ownership.nature: These securities are held directly by Wolfrock Energy, LLC, a Texas limited liability company whose sole member is CS Ventures, Ltd., of which Mr. Meloy and his spouse are the limited partners. CS Ventures, Ltd. is controlled by its general partner, CSV Management Trust, of which Mr. Meloy is the trustee.

SEC source: 0002012978-25-000006 · wk-form4_1763067699.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,788

SEC source: 0001704666-25-000006 · wk-form4_1762808506.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: 119,264

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 $140.28 per share to $140.92 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: 0002012976-25-000003 · wk-form4_1757621104.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,168

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, 2025 of the first 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, 2025.

SEC source: 0001767328-25-000005 · wk-form4_1757621168.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: 67,034

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, 2025 of the first 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, 2025.

SEC source: 0001539838-25-000131 · wk-form4_1754942569.xml · nonDerivative · entry 7

Stice Travis D. · CIK 0001559933 · Director · Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Indirect · TBS Legacy Investments, Ltd.

Disclosed balance after: 0

F1 · shares: These securities were sold by TBS Legacy Investments, Ltd. in which the Stice 2023 Children's Trust holds 100% of the limited partnership units. Mr. Stice's adult children are the beneficiaries of the Stice 2023 Children's Trust.

F9 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $147.36 per share to $147.51 per share, inclusive.

F3 · ownership.direct: The Stice 2023 Children's Trust for the benefit of Mr. Stice's adult children is the limited partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse serve as the trustees of the Stice 2023 Children's Trust and, as a result, may be deemed to have beneficial ownership of the securities in which their adult children have a pecuniary interest. Further, Stice Management, LLC serves as the general partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.

F3 · ownership.nature: The Stice 2023 Children's Trust for the benefit of Mr. Stice's adult children is the limited partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse serve as the trustees of the Stice 2023 Children's Trust and, as a result, may be deemed to have beneficial ownership of the securities in which their adult children have a pecuniary interest. Further, Stice Management, LLC serves as the general partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.

SEC source: 0001539838-25-000131 · wk-form4_1754942569.xml · nonDerivative · entry 6

Stice Travis D. · CIK 0001559933 · Director · Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Indirect · TBS Legacy Investments, Ltd.

Disclosed balance after: 480

F1 · shares: These securities were sold by TBS Legacy Investments, Ltd. in which the Stice 2023 Children's Trust holds 100% of the limited partnership units. Mr. Stice's adult children are the beneficiaries of the Stice 2023 Children's Trust.

F8 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $146.165 per share to $147.08 per share, inclusive.

F3 · ownership.direct: The Stice 2023 Children's Trust for the benefit of Mr. Stice's adult children is the limited partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse serve as the trustees of the Stice 2023 Children's Trust and, as a result, may be deemed to have beneficial ownership of the securities in which their adult children have a pecuniary interest. Further, Stice Management, LLC serves as the general partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.

F3 · ownership.nature: The Stice 2023 Children's Trust for the benefit of Mr. Stice's adult children is the limited partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse serve as the trustees of the Stice 2023 Children's Trust and, as a result, may be deemed to have beneficial ownership of the securities in which their adult children have a pecuniary interest. Further, Stice Management, LLC serves as the general partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.

SEC source: 0001539838-25-000131 · wk-form4_1754942569.xml · nonDerivative · entry 5

Stice Travis D. · CIK 0001559933 · Director · Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Indirect · TBS Legacy Investments, Ltd.

Disclosed balance after: 954

F1 · shares: These securities were sold by TBS Legacy Investments, Ltd. in which the Stice 2023 Children's Trust holds 100% of the limited partnership units. Mr. Stice's adult children are the beneficiaries of the Stice 2023 Children's Trust.

F7 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $145.08 per share to $146.025 per share, inclusive.

F3 · ownership.direct: The Stice 2023 Children's Trust for the benefit of Mr. Stice's adult children is the limited partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse serve as the trustees of the Stice 2023 Children's Trust and, as a result, may be deemed to have beneficial ownership of the securities in which their adult children have a pecuniary interest. Further, Stice Management, LLC serves as the general partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.

F3 · ownership.nature: The Stice 2023 Children's Trust for the benefit of Mr. Stice's adult children is the limited partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse serve as the trustees of the Stice 2023 Children's Trust and, as a result, may be deemed to have beneficial ownership of the securities in which their adult children have a pecuniary interest. Further, Stice Management, LLC serves as the general partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.

SEC source: 0001539838-25-000131 · wk-form4_1754942569.xml · nonDerivative · entry 4

Stice Travis D. · CIK 0001559933 · Director · Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Indirect · TBS Legacy Investments, Ltd.

Disclosed balance after: 1,929

F1 · shares: These securities were sold by TBS Legacy Investments, Ltd. in which the Stice 2023 Children's Trust holds 100% of the limited partnership units. Mr. Stice's adult children are the beneficiaries of the Stice 2023 Children's Trust.

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 $144.025 per share to $145.00 per share, inclusive.

F3 · ownership.direct: The Stice 2023 Children's Trust for the benefit of Mr. Stice's adult children is the limited partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse serve as the trustees of the Stice 2023 Children's Trust and, as a result, may be deemed to have beneficial ownership of the securities in which their adult children have a pecuniary interest. Further, Stice Management, LLC serves as the general partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.

F3 · ownership.nature: The Stice 2023 Children's Trust for the benefit of Mr. Stice's adult children is the limited partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse serve as the trustees of the Stice 2023 Children's Trust and, as a result, may be deemed to have beneficial ownership of the securities in which their adult children have a pecuniary interest. Further, Stice Management, LLC serves as the general partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.

SEC source: 0001539838-25-000131 · wk-form4_1754942569.xml · nonDerivative · entry 3

Stice Travis D. · CIK 0001559933 · Director · Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Indirect · TBS Legacy Investments, Ltd.

Disclosed balance after: 3,221

F1 · shares: These securities were sold by TBS Legacy Investments, Ltd. in which the Stice 2023 Children's Trust holds 100% of the limited partnership units. Mr. Stice's adult children are the beneficiaries of the Stice 2023 Children's Trust.

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 $143.00 per share to $143.92 per share, inclusive.

F3 · ownership.direct: The Stice 2023 Children's Trust for the benefit of Mr. Stice's adult children is the limited partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse serve as the trustees of the Stice 2023 Children's Trust and, as a result, may be deemed to have beneficial ownership of the securities in which their adult children have a pecuniary interest. Further, Stice Management, LLC serves as the general partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.

F3 · ownership.nature: The Stice 2023 Children's Trust for the benefit of Mr. Stice's adult children is the limited partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse serve as the trustees of the Stice 2023 Children's Trust and, as a result, may be deemed to have beneficial ownership of the securities in which their adult children have a pecuniary interest. Further, Stice Management, LLC serves as the general partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.

SEC source: 0001539838-25-000131 · wk-form4_1754942569.xml · nonDerivative · entry 2

Stice Travis D. · CIK 0001559933 · Director · Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Indirect · TBS Legacy Investments, Ltd.

Disclosed balance after: 5,699

F1 · shares: These securities were sold by TBS Legacy Investments, Ltd. in which the Stice 2023 Children's Trust holds 100% of the limited partnership units. Mr. Stice's adult children are the beneficiaries of the Stice 2023 Children's Trust.

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 $141.92 per share to $142.91 per share, inclusive.

F3 · ownership.direct: The Stice 2023 Children's Trust for the benefit of Mr. Stice's adult children is the limited partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse serve as the trustees of the Stice 2023 Children's Trust and, as a result, may be deemed to have beneficial ownership of the securities in which their adult children have a pecuniary interest. Further, Stice Management, LLC serves as the general partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.

F3 · ownership.nature: The Stice 2023 Children's Trust for the benefit of Mr. Stice's adult children is the limited partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse serve as the trustees of the Stice 2023 Children's Trust and, as a result, may be deemed to have beneficial ownership of the securities in which their adult children have a pecuniary interest. Further, Stice Management, LLC serves as the general partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.

SEC source: 0001539838-25-000131 · wk-form4_1754942569.xml · nonDerivative · entry 1

Stice Travis D. · CIK 0001559933 · Director · Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Indirect · TBS Legacy Investments, Ltd.

Disclosed balance after: 15,922

F1 · shares: These securities were sold by TBS Legacy Investments, Ltd. in which the Stice 2023 Children's Trust holds 100% of the limited partnership units. Mr. Stice's adult children are the beneficiaries of the Stice 2023 Children's Trust.

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 $140.91 per share to $141.89 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 and in footnotes 4 through 9.

F3 · ownership.direct: The Stice 2023 Children's Trust for the benefit of Mr. Stice's adult children is the limited partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse serve as the trustees of the Stice 2023 Children's Trust and, as a result, may be deemed to have beneficial ownership of the securities in which their adult children have a pecuniary interest. Further, Stice Management, LLC serves as the general partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.

F3 · ownership.nature: The Stice 2023 Children's Trust for the benefit of Mr. Stice's adult children is the limited partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse serve as the trustees of the Stice 2023 Children's Trust and, as a result, may be deemed to have beneficial ownership of the securities in which their adult children have a pecuniary interest. Further, Stice Management, LLC serves as the general partner of TBS Legacy Investments, Ltd. Mr. Stice and his spouse hold 100% of the membership interests in Stice Management, LLC, of which Mr. Stice is the manager.

SEC source: 0001539838-25-000117 · wk-form4_1750712915.xml · nonDerivative · entry 1

Plaumann Mark Lawrence · CIK 0001290795 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,267

F1 · shares: An aggregate of 2,965 shares of the issuer's common stock was distributed by Greyhawke Capital Advisors LLC ("Greyhawke") in an in-kind distribution to Mr. Plaumann in connection with the amendment of the Greyhawke limited liability company agreement executed by the members and the manager of Greyhawke on June 19, 2025 during the issuer's open trading window (the "Amended Greyhawke LLC Agreement").

SEC source: 0001539838-25-000115 · wk-form4_1750449701.xml · nonDerivative · entry 3

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 1,078,864

F1 · shares: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Mr. Meloy on December 3, 2024.

F3 · ownership.direct: These securities are held directly by Wolfrock Energy, LLC, a Texas limited liability company whose sole member is CS Ventures, Ltd., of which Mr. Meloy and his spouse are the limited partners. CS Ventures, Ltd. is controlled by its general partner, CSV Management Trust, of which Mr. Meloy is the trustee.

F3 · ownership.nature: These securities are held directly by Wolfrock Energy, LLC, a Texas limited liability company whose sole member is CS Ventures, Ltd., of which Mr. Meloy and his spouse are the limited partners. CS Ventures, Ltd. is controlled by its general partner, CSV Management Trust, of which Mr. Meloy is the trustee.

SEC source: 0001539838-25-000115 · wk-form4_1750449701.xml · nonDerivative · entry 2

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 1,078,951

F1 · shares: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Mr. Meloy on December 3, 2024.

F3 · ownership.direct: These securities are held directly by Wolfrock Energy, LLC, a Texas limited liability company whose sole member is CS Ventures, Ltd., of which Mr. Meloy and his spouse are the limited partners. CS Ventures, Ltd. is controlled by its general partner, CSV Management Trust, of which Mr. Meloy is the trustee.

F3 · ownership.nature: These securities are held directly by Wolfrock Energy, LLC, a Texas limited liability company whose sole member is CS Ventures, Ltd., of which Mr. Meloy and his spouse are the limited partners. CS Ventures, Ltd. is controlled by its general partner, CSV Management Trust, of which Mr. Meloy is the trustee.

SEC source: 0001539838-25-000115 · wk-form4_1750449701.xml · nonDerivative · entry 1

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · Wolfrock Energy, LLC

Disclosed balance after: 1,078,978

F1 · shares: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Mr. Meloy on December 3, 2024.

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 $155.00 per share to $155.99 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.

F3 · ownership.direct: These securities are held directly by Wolfrock Energy, LLC, a Texas limited liability company whose sole member is CS Ventures, Ltd., of which Mr. Meloy and his spouse are the limited partners. CS Ventures, Ltd. is controlled by its general partner, CSV Management Trust, of which Mr. Meloy is the trustee.

F3 · ownership.nature: These securities are held directly by Wolfrock Energy, LLC, a Texas limited liability company whose sole member is CS Ventures, Ltd., of which Mr. Meloy and his spouse are the limited partners. CS Ventures, Ltd. is controlled by its general partner, CSV Management Trust, of which Mr. Meloy is the trustee.

SEC source: 0001539838-25-000113 · wk-form4_1749672168.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,788

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 $141.4491 per share to $141.64 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.

SEC source: 0001539838-25-000111 · wk-form4_1749154128.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 84,117

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 $142.0565 per share to $142.14 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: 0001539838-25-000099 · wk-form4_1747953463.xml · nonDerivative · entry 1

Brooks Vincent K · CIK 0001809046 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · VKB Solutions, LLC

Disclosed balance after: 10,653

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 2026 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: 0001539838-25-000102 · wk-form4_1747953493.xml · nonDerivative · entry 1

KLEIN REBECCA A · CIK 0001488085 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,147

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 2026 annual meeting of stockholders of the issuer.

SEC source: 0001539838-25-000103 · wk-form4_1747953503.xml · nonDerivative · entry 1

Plaumann Mark Lawrence · CIK 0001290795 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,302

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 2026 annual meeting of stockholders of the issuer.

F2 · balance_after: All of the 1,417 restricted stock units granted to Mr. Plaumann on May 21, 2025 have been assigned by Mr. Plaumann to Greyhawke Capital Advisors LLC ("Greyhawke") under the terms of his employment with Greyhawke. Mr. Plaumann is a managing member of Greyhawke and a holder of a 50% ownership interest in Greyhawke.

SEC source: 0001539838-25-000097 · wk-form4_1747953442.xml · nonDerivative · entry 1

HOLDERNESS DARIN G · CIK 0001187965 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,816

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 2026 annual meeting of stockholders of the issuer.

SEC source: 0001539838-25-000107 · wk-form4_1747953545.xml · nonDerivative · entry 1

REEVES ROBERT K · CIK 0001188140 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,084

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 2026 annual meeting of stockholders of the issuer.

SEC source: 0001539838-25-000104 · wk-form4_1747953514.xml · nonDerivative · entry 1

WEST STEVEN E · CIK 0001190898 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,552

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 2026 annual meeting of stockholders of the issuer.

SEC source: 0001539838-25-000098 · wk-form4_1747953453.xml · nonDerivative · entry 1

Meloy Charles Alvin · CIK 0001333454 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,275

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 2026 annual meeting of stockholders of the issuer.

SEC source: 0001539838-25-000106 · wk-form4_1747953535.xml · nonDerivative · entry 1

Trent Melanie Montague · CIK 0001343137 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,057

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 2026 annual meeting of stockholders of the issuer.

SEC source: 0001539838-25-000108 · wk-form4_1747953557.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: 129,264

F2 · 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 May 21, 2025 of the first tranche of the time-based restricted stock units granted to the reporting person on May 21, 2025. The number of shares of common stock withheld was determined based on the five trading days immediately preceding May 21, 2025.

F2 · price: 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 May 21, 2025 of the first tranche of the time-based restricted stock units granted to the reporting person on May 21, 2025. The number of shares of common stock withheld was determined based on the five trading days immediately preceding May 21, 2025.

SEC source: 0001539838-25-000108 · wk-form4_1747953557.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: 130,566

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. Van't Hof under the issuer's equity incentive plan in connection with his promotion as Chief Executive Officer of the issuer, of which 3,307 restricted stock units vested on May 21, 2025 and 6,614 restricted stock units will vest in two remaining equal annual installments beginning on March 1, 2026.

SEC source: 0001539838-25-000105 · wk-form4_1747953525.xml · nonDerivative · entry 1

Mains Stephanie K. · CIK 0001766980 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,653

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 2026 annual meeting of stockholders of the issuer.

SEC source: 0001539838-25-000101 · wk-form4_1747953483.xml · nonDerivative · entry 1

Robertson Lance W · CIK 0001567274 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,017

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. Robertson 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 2026 annual meeting of stockholders of the issuer.

SEC source: 0001539838-25-000100 · wk-form4_1747953473.xml · nonDerivative · entry 1

Tsuru Frank D. · CIK 0001936468 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,147

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 2026 annual meeting of stockholders of the issuer.