[Form 4] Diamondback Energy, Inc. Insider Trading Activity

Diamondback Energy, Inc. director Charles A. Meloy reported indirect sales of company common stock through Wolfrock Energy, LLC, an entity ultimately controlled by him.

Rhea-AI Filing Summary

Diamondback Energy, Inc. director Charles A. Meloy reported indirect sales of company common stock through Wolfrock Energy, LLC, an entity ultimately controlled by him. On February 2, 2026, Wolfrock sold 2,200 shares at a weighted average price of $160.1675 per share. On February 3, 2026, Wolfrock sold 36,310 shares at $160.3683, 5,597 shares at $161.4204, and 18,698 shares at $162.4941, all as weighted average prices across multiple trades within stated price ranges. These transactions were made under a Rule 10b5-1 trading plan adopted on August 13, 2025. Following the reported sales, Wolfrock held 982,006 indirect shares, and Mr. Meloy also held 2,275 shares directly.

Insider Trade Summary

Net Seller: 62,805 shares

Net Sell 5 txns

Insider Meloy Charles Alvin

Role Director

Sold 62,805 shs ($10.12M)

Type	Security	Shares	Price	Value
Sale	Common Stock	36,310	$160.3683	$5.82M
Sale	Common Stock	5,597	$161.4204	$903K
Sale	Common Stock	18,698	$162.4941	$3.04M
Sale	Common Stock	2,200	$160.1675	$352K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 982,006 shares (Indirect, Wolfrock Energy, LLC); Common Stock — 2,275 shares (Direct)

Footnotes (6)

1. F1. 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.
2. F2. 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.
3. F3. 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.
4. F4. 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.
5. F5. 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.
6. F6. 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.

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Accepted by SEC EDGAR 02/04/2026 - 04:01 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Meloy Charles Alvin

(Last) (First) (Middle)

500 WEST TEXAS AVENUE

SUITE 100

(Street)

MIDLAND TX 79701

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Diamondback Energy, Inc. [ FANG ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
02/02/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	02/02/2026		S		2,200(1)	D	$160.1675(2)	1,042,611	I(3)	Wolfrock Energy, LLC(3)
Common Stock	02/03/2026		S		36,310(1)	D	$160.3683(4)	1,006,301	I(3)	Wolfrock Energy, LLC(3)
Common Stock	02/03/2026		S		5,597(1)	D	$161.4204(5)	1,000,704	I(3)	Wolfrock Energy, LLC(3)
Common Stock	02/03/2026		S		18,698(1)	D	$162.4941(6)	982,006	I(3)	Wolfrock Energy, LLC(3)
Common Stock								2,275	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.

Remarks:

	/s/ Matt Zmigrosky, as attorney-in-fact for Charles A. Meloy	02/04/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.