Diamondback Energy (NASDAQ: FANG) EVP sells 4,101 shares

Rhea-AI Filing Summary

Diamondback Energy EVP and Chief Legal and Administrative Officer Matt Zmigrosky reported an open-market sale of 4,101 shares of common stock on March 18, 2026. The weighted average sale price was about $190.51 per share, with individual trades ranging from $190.48 to $190.68. Following this transaction, he directly holds 56,392 shares of Diamondback Energy common stock.

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

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

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^*

Zmigrosky Matt

(Last) (First) (Middle)

500 WEST TEXAS AVENUE

SUITE 100

(Street)

MIDLAND TEXAS 79701

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Chief Legal and Admin Off

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/18/2026

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

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

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

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	03/18/2026		S		4,101	D	$190.5128(1)	56,392	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 price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $190.48 per share to $190.68 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	03/19/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Diamondback Energy (FANG) report for Matt Zmigrosky?

Diamondback Energy reported that EVP and Chief Legal and Administrative Officer Matt Zmigrosky sold 4,101 shares of common stock in an open-market transaction. This Form 4 filing details the size of the sale, the sale prices, and his updated direct ownership position.

At what price did Matt Zmigrosky sell Diamondback Energy (FANG) shares?

The reported transaction used a weighted average sale price of about $190.51 per share. According to the filing, the 4,101 shares were sold in multiple trades at prices ranging from $190.48 to $190.68 per share, inclusive, across that trading day.

How many Diamondback Energy (FANG) shares does Matt Zmigrosky hold after this sale?

After selling 4,101 shares, Matt Zmigrosky now directly holds 56,392 shares of Diamondback Energy common stock. This updated figure reflects his remaining direct ownership as reported in the Form 4 and helps investors gauge his ongoing equity stake in the company.

What type of insider transaction did Diamondback Energy (FANG) disclose?

The company disclosed an open-market sale of common stock by executive officer Matt Zmigrosky, coded as an “S” transaction on Form 4. This indicates a voluntary sale into the market rather than a grant, option exercise, tax withholding, or internal share transfer.

Did Matt Zmigrosky’s Diamondback Energy (FANG) sale occur in a single trade?

No. The filing states the 4,101 shares were sold in multiple transactions within a price range from $190.48 to $190.68 per share. The reported $190.51 figure is a weighted average price across those individual trades.