SGF FANG Holdings, LP - 03 Feb 2026 Form 4 Insider Report for Diamondback Energy, Inc. (FANG)

Role: 10%+ Owner
Signature: /s/ Kevin T. Keen, Attorney in fact
Issuer symbol: FANG
Transactions as of: 03 Feb 2026
Net transactions value: -$331,870,000
Form type: 4
Filing time: 05 Feb 2026, 16:15:21 UTC
Previous filing: 02 Dec 2025
Next filing: 05 Mar 2026
SEC: View on sec.gov

Reporting Owners (2)

Name	Relationship	Address	Signature	Signature date	CIK
SGF FANG Holdings, LP	10%+ Owner	C/O SGF CAPITAL LLC, KEVIN T. KEEN, 8111 DOUGLAS AVENUE, SUITE 1200, DALLAS	/s/ Kevin T. Keen, Attorney in fact	05 Feb 2026	0002080063
Greth Lyndal	10%+ Owner	C/O SGF CAPITAL LLC, KEVIN T. KEEN, 8111 DOUGLAS AVENUE, SUITE 1200, DALLAS	/s/ Kevin T. Keen, Attorney in fact	05 Feb 2026	0002021141

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	FANG	Common Stock	Sale	$162,880,000	-1,000,000	-1%	$162.88	98,686,727	03 Feb 2026	Direct	F1
transaction	FANG	Common Stock	Sale	$168,990,000	-1,000,000	-1%	$168.99	97,686,727	04 Feb 2026	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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.

Content

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.