Diamondback EVP has 861 shares withheld for tax

Rhea-AI Filing Summary

Diamondback Energy, Inc. (FANG) reported that executive officer Matt Zmigrosky, EVP, Chief Legal and Administrative Officer, had 861 shares of common stock withheld on September 10, 2026 to satisfy tax withholding obligations upon vesting of time-based restricted stock units. These shares were withheld at $202.63 per share, leaving him with 38,031 directly held shares of Diamondback Energy common stock.

Insider Trade Summary

Tax Withholding: 861 shares

Tax Withholding 1 txn

Insider Zmigrosky Matt

Role EVP, Chief Legal and Admin Off

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	861	$202.63	$174K

Holdings After Transaction: Common Stock — 38,031 shares (Direct)

Footnotes (1)

1. F1. The issuer withheld shares of common stock that would have otherwise been issuable to the reporting person to satisfy the issuer's tax withholding obligations in connection with the vesting and settlement on September 10, 2026 of the second tranche of the time-based restricted stock units granted to the reporting person on September 10, 2024. The number of shares of common stock withheld was determined based on the closing price per share of the issuer's common stock on September 9, 2026.

Key Figures

Shares withheld for tax: 861 shares Withholding price per share: $202.63 per share Shares held after transaction: 38,031 shares +2 more

5 metrics

Shares withheld for tax 861 shares Common stock withheld on September 10, 2026 to satisfy tax withholding obligations

Withholding price per share $202.63 per share Based on closing price of common stock on September 9, 2026

Shares held after transaction 38,031 shares Directly owned common stock following the September 10, 2026 withholding

RSU grant date September 10, 2024 Grant date of time-based restricted stock units whose second tranche vested

Transaction count on Form 4 1 transaction Single tax-withholding disposition of common stock reported

Key Terms

restricted stock units, tax withholding obligations, vesting and settlement

3 terms

restricted stock units financial

"the vesting and settlement on September 10, 2026 of the second tranche of the time-based restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding obligations financial

"to satisfy the issuer's tax withholding obligations in connection with the vesting"

vesting and settlement financial

"in connection with the vesting and settlement on September 10, 2026 of the second tranche"

FAQ

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

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

Diamondback Energy reported that Matt Zmigrosky had 861 shares of common stock withheld on September 10, 2026 to satisfy tax withholding obligations related to the vesting and settlement of time-based restricted stock units.

Was the Diamondback Energy (FANG) Form 4 transaction a market sale or a tax withholding?

The Form 4 transaction was a tax-withholding disposition. The issuer withheld 861 shares of common stock that would otherwise have been issued to Matt Zmigrosky to satisfy the issuer’s tax withholding obligations tied to RSU vesting.

How many Diamondback Energy (FANG) shares does Matt Zmigrosky hold after this Form 4 event?

After the September 10, 2026 tax-withholding event, Matt Zmigrosky holds 38,031 shares of Diamondback Energy common stock, reported as direct ownership following the transaction.

What price per share was used for the Diamondback Energy (FANG) tax-withholding shares?

The 861 shares withheld for taxes were valued using a price of $202.63 per share, based on the closing price of Diamondback Energy’s common stock on September 9, 2026.

What triggered the tax withholding reported in the Diamondback Energy (FANG) Form 4?

The tax withholding was triggered by the vesting and settlement on September 10, 2026 of the second tranche of time-based restricted stock units granted to Matt Zmigrosky on September 10, 2024.

Was the Diamondback Energy (FANG) insider transaction under a Rule 10b5-1 plan?

No. The filing indicates that the Rule 10b5-1 checkbox was not marked as affirmative, so this reported tax-withholding disposition was not identified as made under a Rule 10b5-1 trading plan.

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

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Available on EDGAR 09/14/2026 - 04:06 PM Accepted by SEC EDGAR 09/14/2026 - 04:05 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)
09/10/2026

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	09/10/2026		F		861(1)	D	$202.63	38,031	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 issuer withheld shares of common stock that would have otherwise been issuable to the reporting person to satisfy the issuer's tax withholding obligations in connection with the vesting and settlement on September 10, 2026 of the second tranche of the time-based restricted stock units granted to the reporting person on September 10, 2024. The number of shares of common stock withheld was determined based on the closing price per share of the issuer's common stock on September 9, 2026.

Remarks:

	/s/ Matt Zmigrosky	09/14/2026
	** 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)