Diamondback EVP sells 1,326 shares at $212

Rhea-AI Filing Summary

Diamondback Energy, Inc. (FANG) reported that executive vice president and chief legal and administrative officer Matt Zmigrosky sold 1,326 shares of common stock on September 15, 2026 in a sale described as occurring in an open-market or private transaction at a price of $212.5554 per share. Following this transaction, he directly held 36,705 shares of Diamondback Energy common stock. No Rule 10b5-1 trading plan is reported for this sale.

Insider Trade Summary

Net Seller: 1,326 shares

Net Sell 1 txn

Insider Zmigrosky Matt

Role EVP, Chief Legal and Admin Off

Sold 1,326 shs ($282K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,326	$212.5554	$282K

Holdings After Transaction: Common Stock — 36,705 shares (Direct)

Key Figures

Shares sold: 1,326 shares Sale price per share: $212.5554 per share Shares held after transaction: 36,705 shares +2 more

5 metrics

Shares sold 1,326 shares Common stock sale reported for September 15, 2026

Sale price per share $212.5554 per share Open-market or private transaction on September 15, 2026

Shares held after transaction 36,705 shares Direct holdings of Matt Zmigrosky after the September 15, 2026 sale

Number of sale transactions 1 transaction Single reported insider sale on the Form 4

Net shares sold 1,326 shares Net effect of reported insider transactions in this filing

Key Terms

open market or private transaction, direct ownership, Rule 10b5-1 trading plan

3 terms

open market or private transaction financial

"described as occurring in an open-market or private transaction at a price"

direct ownership financial

"he directly held 36,705 shares of Diamondback Energy common stock"

Rule 10b5-1 trading plan regulatory

"No Rule 10b5-1 trading plan is reported for this sale"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

FAQ

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

What insider transaction did FANG disclose for Matt Zmigrosky?

Diamondback Energy disclosed that Matt Zmigrosky, its executive vice president and chief legal and administrative officer, sold 1,326 shares of common stock on September 15, 2026 in an open-market or private transaction at $212.5554 per share.

How many FANG shares does the insider hold after the reported sale?

After the reported sale on September 15, 2026, Matt Zmigrosky directly held 36,705 shares of Diamondback Energy common stock, as stated in the filing.

Was the September 15, 2026 FANG insider sale under a Rule 10b5-1 trading plan?

No. The filing indicates that the sale of 1,326 shares by Matt Zmigrosky on September 15, 2026 was not made pursuant to a Rule 10b5-1 trading plan.

What was the sale price for the FANG shares sold by the insider?

The reported sale price for the transaction on September 15, 2026 was $212.5554 per share for the 1,326 shares of Diamondback Energy common stock sold.

How many insider sale transactions does this FANG Form 4 report?

The Form 4 reports one sale transaction: an open-market or private sale of 1,326 shares of Diamondback Energy common stock on September 15, 2026.

Is the insider’s ownership in FANG direct or indirect after the transaction?

After the September 15, 2026 sale, the filing states that Matt Zmigrosky’s remaining 36,705 shares of Diamondback Energy common stock are held through direct ownership.

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

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 09/17/2026 - 04:04 PM Accepted by SEC EDGAR 09/17/2026 - 04:03 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)
09/15/2026

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	09/15/2026		S		1,326	D	$212.5554	36,705	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:

Remarks:

	/s/ Matt Zmigrosky	09/17/2026
	** 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)