Diamondback CEO sells 10,000 shares near $215 each

Diamondback Energy, Inc. (FANG) reported that Chief Executive Officer and director Matthew Kaes Van't Hof sold a total of 10,000 shares of common stock on 2026-08-20 in open market or private transactions.

Rhea-AI Filing Summary

Diamondback Energy, Inc. (FANG) reported that Chief Executive Officer and director Matthew Kaes Van't Hof sold a total of 10,000 shares of common stock on 2026-08-20 in open market or private transactions. One block of 9,500 shares was sold at a weighted average price of $214.64 per share, in multiple trades ranging from $214.015 to $215.01. A second block of 500 shares was sold at a weighted average price of $215.056 per share, in multiple trades ranging from $215.045 to $215.07. The filing does not report the executive’s total holdings after these transactions.

Insider Trade Summary

Net Seller: 10,000 shares

Net Sell 2 txns

Insider Van't Hof Matthew Kaes

Role Chief Executive Officer

Sold 10,000 shs ($2.15M)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	9,500	$214.64	$2.04M
Sale	Common Stock F2	500	$215.056	$108K

Holdings After Transaction: Common Stock — 115,940 shares (Direct)

Footnotes (2)

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 $214.015 per share to $215.01 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 and in footnote 2.
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 $215.045 per share to $215.07 per share, inclusive.

Key Figures

Shares sold (total): 10,000 shares First block sold: 9,500 shares Weighted average price (9,500-share sale): $214.64 per share +4 more

7 metrics

Shares sold (total) 10,000 shares Common stock sold by CEO Matthew Kaes Van't Hof on 2026-08-20

First block sold 9,500 shares Common stock sale on 2026-08-20 at weighted average price

Weighted average price (9,500-share sale) $214.64 per share Executed in multiple trades from $214.015 to $215.01

Price range (9,500-share sale) $214.015 to $215.01 per share Range of individual trade prices for first block

Second block sold 500 shares Common stock sale on 2026-08-20 at weighted average price

Weighted average price (500-share sale) $215.056 per share Executed in multiple trades from $215.045 to $215.07

Price range (500-share sale) $215.045 to $215.07 per share Range of individual trade prices for second block

Key Terms

weighted average sale price, open market or private transaction, acquired_disposed_code

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"

acquired_disposed_code financial

"acquired_disposed_code": "D""

FAQ

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

What insider transaction did FANG report for CEO Matthew Kaes Van't Hof?

Diamondback Energy, Inc. reported that CEO Matthew Kaes Van't Hof sold 10,000 shares of common stock on 2026-08-20 in open market or private transactions, split between a 9,500-share sale and a separate 500-share sale.

At what prices did the FANG CEO sell shares on 2026-08-20?

The CEO sold 9,500 shares at a weighted average price of $214.64 (individual trades from $214.015 to $215.01) and 500 shares at a weighted average price of $215.056 (trades from $215.045 to $215.07).

How many FANG shares in total were sold by the CEO in this Form 4?

In this Form 4, the Diamondback Energy CEO reported total sales of 10,000 shares of common stock, consisting of one 9,500-share transaction and one 500-share transaction on 2026-08-20.

Were the reported FANG insider sales executed as multiple trades within price ranges?

Yes. The 9,500-share sale was executed in multiple trades between $214.015 and $215.01 per share, and the 500-share sale in multiple trades between $215.045 and $215.07, each reported as a weighted average sale price.

Does the Form 4 state the CEO’s FANG share holdings after these sales?

The Form 4 does not state a total share amount held by the CEO after the 10,000-share sale. The post-transaction holdings field is not completed for these transactions.

Were the FANG CEO’s sales reported as open market or private transactions?

Both transactions are coded “S”, described as a Sale in open market or private transaction, indicating they were reported as standard sale transactions rather than option exercises or other derivative-related events.

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

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Available on EDGAR 08/24/2026 - 04:02 PM EDT Accepted by SEC EDGAR 08/24/2026 - 04:01 PM EDT 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^*

Van't Hof Matthew Kaes

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/20/2026

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	08/20/2026		S		9,500	D	$214.64(1)	116,440	D
Common Stock	08/20/2026		S		500	D	$215.056(2)	115,940	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 $214.015 per share to $215.01 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 and in footnote 2.

2. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $215.045 per share to $215.07 per share, inclusive.

Remarks:

	/s/ Matt Zmigrosky, as attorney-in-fact for Matthew Kaes Van't Hof	08/24/2026
	** 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)