X0508 4 2024-09-23 0001539838 Diamondback Energy, Inc. FANG 0002021141 Greth Lyndal C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS TX 75201 true 0002036250 ACS Capital Management, LLC C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS TX 75201 true 0002036984 ACS Capital Holdings, LP C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS TX 75201 true 0002021136 Stephens Family Trust C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS TX 75201 true 0002021135 Stephens Family Trust #2 C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS TX 75201 true 0002036247 SFT Management, LLC C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS TX 75201 true 0002036246 SFT 1 Holdings, LLC C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS TX 75201 true 0002036245 SFT 2 Holdings, LLC C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS TX 75201 true 0002021106 Autry Stephens Management Trust C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS TX 75201 true 0002021108 Endeavor Manager, LLC C/O KATTEN MUCHIN ROSENMAN LLP 2121 N. PEARL STREET, SUITE 1100 DALLAS TX 75201 true false Common Stock 2024-09-23 4 S 0 1348510 175.1075 D 10378196 I See Footnotes Common Stock 2024-09-23 4 S 0 134851 175.1075 D 1037819 I See Footnotes Common Stock 2024-09-23 4 S 0 7578332 175.1075 D 58323346 I See Footnotes Common Stock 2024-09-23 4 S 0 4151137 175.1075 D 31947366 I See Footnotes 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. Lyndal Stephens Greth has voting and dispositive power over the shares held directly by ACS Capital Holdings, LP. 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. Lyndal Stephens Greth has voting and dispositive power over the shares held directly by Endeavor Manager, LLC. 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. Lyndal Stephens Greth has voting and dispositive power over the shares held directly by SFT 1 Holdings, LLC. 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. Lyndal Stephens Greth has voting and dispositive power over the shares held directly by SFT 2 Holdings, LLC. 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. /s/ Lyndal Stephens Greth Attorney-in-fact 2024-09-23