Diamondback Energy (NASDAQ: FANG) director sells 1,000 shares

Rhea-AI Filing Summary

Diamondback Energy, Inc. (FANG) director Mark Lawrence Plaumann reported a sale of company common stock. On 2026-08-21, he sold 1,000 shares of common stock in a transaction characterized as a sale in an open market or private transaction at $210.5766 per share. Following this sale, he directly owned 12,437 shares of Diamondback Energy common stock.

Insider Trade Summary

Net Seller: 1,000 shares

Net Sell 1 txn

Insider Plaumann Mark Lawrence

Role Director

Sold 1,000 shs ($211K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,000	$210.5766	$211K

Holdings After Transaction: Common Stock — 12,437 shares (Direct)

Key Figures

Shares sold: 1,000 shares of Common Stock Sale price per share: $210.5766 per share Shares owned after transaction: 12,437 shares of Common Stock +1 more

4 metrics

Shares sold 1,000 shares of Common Stock Sale reported on 2026-08-21 by director Mark Lawrence Plaumann

Sale price per share $210.5766 per share Price for the 1,000-share sale on 2026-08-21

Shares owned after transaction 12,437 shares of Common Stock Direct holdings after the 1,000-share sale

Net shares sold 1,000 shares Net change in reported holdings from this Form 4 transaction

Key Terms

Common Stock, Form 4, open market or private transaction

3 terms

Common Stock financial

"security_title: "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

open market or private transaction financial

"transaction_code_description: "Sale in open market or private transaction""

FAQ

What insider transaction did FANG director Mark Plaumann report?

Mark Lawrence Plaumann reported a sale of 1,000 shares of Diamondback Energy, Inc. common stock on 2026-08-21 in a transaction described as a sale in an open market or private transaction.

At what price did Mark Plaumann sell Diamondback Energy (FANG) shares?

Mark Lawrence Plaumann sold 1,000 FANG shares at a price of $210.5766 per share, as reported for the 2026-08-21 transaction in Diamondback Energy, Inc. common stock.

How many Diamondback Energy (FANG) shares does Mark Plaumann hold after the reported sale?

After the reported sale, Mark Lawrence Plaumann directly held 12,437 shares of Diamondback Energy, Inc. common stock, according to the Form 4 disclosure.

Was the 1,000-share FANG transaction a buy or a sell?

The 1,000-share transaction reported by Mark Lawrence Plaumann was a sale of Diamondback Energy, Inc. common stock, coded as a sale in an open market or private transaction.

Does the Form 4 for Diamondback Energy (FANG) report any derivative transactions?

No derivative transactions are reported in this Form 4 for Diamondback Energy, Inc.; the filing shows only a single sale of 1,000 shares of common stock by director Mark Lawrence Plaumann.

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

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Form 4 Insider Transactions: What Each Field Means →

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

Plaumann Mark Lawrence

(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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/21/2026

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	08/21/2026		S		1,000	D	$210.5766	12,437	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, as attorney-in-fact for Mark L. Plaumann	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)