Diamondback Energy (FANG) director sells 500 shares in market

Rhea-AI Filing Summary

Diamondback Energy, Inc. director Mark Lawrence Plaumann reported an open-market sale of 500 shares of Common Stock at $196.50 per share. After this transaction, he directly holds 13,437 shares, indicating he retains a meaningful continuing equity stake in the company.

Insider Trade Summary

Net Seller: 500 shares ($98,250)

Net Sell 1 txn

Insider Plaumann Mark Lawrence

Role null

Sold 500 shs ($98K)

Type	Security	Shares	Price	Value
Sale	Common Stock	500	$196.50	$98K

Holdings After Transaction: Common Stock — 13,437 shares (Direct, null)

Footnotes (1)

Key Figures

Shares sold: 500 shares Sale price: $196.50 per share Shares held after sale: 13,437 shares

3 metrics

Shares sold 500 shares Open-market sale of Common Stock

Sale price $196.50 per share Price for the 500-share open-market sale

Shares held after sale 13,437 shares Direct ownership following the transaction

Key Terms

open-market sale, Common Stock, Form 4

3 terms

open-market sale financial

"The transaction is described as an open-market sale of 500 shares."

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Common Stock financial

"The security involved in the transaction is 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

"The insider transaction was reported on a Form 4 filing."

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.

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Form 4 Insider Transactions: What Each Field Means →

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)
06/09/2026

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	06/09/2026		S		500	D	$196.5	13,437	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	06/10/2026
	** 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)

FAQ

What insider transaction did Diamondback Energy (FANG) disclose in this Form 4?

Diamondback Energy reported that director Mark Lawrence Plaumann completed an open-market sale of 500 shares of Common Stock at $196.50 per share. The transaction reflects a reduction in his direct holdings but he continues to own a substantial number of shares.

Who is the insider involved in the latest Diamondback Energy (FANG) share sale?

The insider is Mark Lawrence Plaumann, a director of Diamondback Energy. He reported selling 500 shares of Common Stock in an open-market transaction at $196.50 per share, and he continues to hold 13,437 shares directly after the sale.

How many Diamondback Energy (FANG) shares did the director sell and at what price?

The director sold 500 shares of Diamondback Energy Common Stock at a price of $196.50 per share. This sale was reported as an open-market transaction and is classified as a non-derivative disposition of existing shares.

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

Following the reported open-market sale, director Mark Lawrence Plaumann directly holds 13,437 shares of Diamondback Energy Common Stock. This figure reflects his position immediately after disposing of 500 shares at $196.50 per share.

Was the Diamondback Energy (FANG) insider transaction a buy or a sell?

The transaction was a sell. Director Mark Lawrence Plaumann executed an open-market sale of 500 shares of Diamondback Energy Common Stock at $196.50 per share, reducing his stake while maintaining a sizable remaining holding of 13,437 shares.