Diamondback EVP sells 2,500 shares at about $203

Diamondback Energy, Inc. executive Matt Zmigrosky, EVP, Chief Legal and Administrative Officer, reported a sale of 2,500 shares of Common Stock on 2026-08-14.

Rhea-AI Filing Summary

Diamondback Energy, Inc. executive Matt Zmigrosky, EVP, Chief Legal and Administrative Officer, reported a sale of 2,500 shares of Common Stock on 2026-08-14. The weighted average sale price was $202.7721 per share, with individual trades executed between $202.6701 and $202.89. After this transaction, he directly holds 38,892 shares of Diamondback Energy common stock.

Insider Trade Summary

Net Seller: 2,500 shares

Net Sell 1 txn

Insider Zmigrosky Matt

Role EVP, Chief Legal and Admin Off

Sold 2,500 shs ($507K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	2,500	$202.7721	$507K

Holdings After Transaction: Common Stock — 38,892 shares (Direct)

Footnotes (1)

1. F1. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $202.6701 per share to $202.89 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.

Key Figures

Shares sold: 2,500 shares Weighted average sale price: $202.7721 per share Sale price range low: $202.6701 per share +2 more

5 metrics

Shares sold 2,500 shares Common Stock sale on 2026-08-14 by EVP Matt Zmigrosky

Weighted average sale price $202.7721 per share Average price for the 2,500 shares sold

Sale price range low $202.6701 per share Lowest price in the multiple sale transactions

Sale price range high $202.89 per share Highest price in the multiple sale transactions

Shares owned after transaction 38,892 shares Directly held Common Stock following the reported sale

Key Terms

weighted average sale price, open market or private transaction, non-derivative

3 terms

weighted average sale price financial

"The price reported in Column 4 is a weighted average sale price."

open market or private transaction financial

"transaction_code_description: Sale in open market or private transaction"

non-derivative financial

"transaction_type: non-derivative"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did FANG executive Matt Zmigrosky report on this Form 4?

Matt Zmigrosky reported selling 2,500 shares of Diamondback Energy, Inc. (FANG) common stock on 2026-08-14. These shares were sold in multiple transactions, all on that date, as disclosed in the Form 4 filing.

At what price did the FANG shares sell in Matt Zmigrosky’s August 2026 transaction?

The reported weighted average sale price was $202.7721 per share. Individual trades occurred at prices ranging from $202.6701 to $202.89 per share, according to the transaction footnote in the Form 4.

How many FANG shares does Matt Zmigrosky hold after the reported sale?

After selling 2,500 shares, Matt Zmigrosky directly holds 38,892 shares of Diamondback Energy, Inc. (FANG) common stock. This figure reflects his post-transaction ownership as reported in the Form 4 filing.

Was the August 2026 FANG insider sale by Matt Zmigrosky made under a Rule 10b5-1 plan?

The filing indicates the Rule 10b5-1 checkbox is not affirmed for this transaction. There is no footnote stating that the sale was made pursuant to a pre-arranged 10b5-1 trading plan.

What type of transaction did the FANG Form 4 report for Matt Zmigrosky?

The Form 4 reports a Code S transaction, described as a sale in open market or private transaction. It involves non-derivative common stock rather than options or other derivative securities.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/17/2026 - 04:02 PM Accepted by SEC EDGAR 08/17/2026 - 04:02 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).

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)
08/14/2026

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	08/14/2026		S		2,500	D	$202.7721(1)	38,892	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 $202.6701 per share to $202.89 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.

Remarks:

	/s/ Matt Zmigrosky	08/17/2026
	** 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)