Diamondback EVP Barkmann sells 3,000 FANG shares

Diamondback Energy, Inc. Executive Vice President and Chief Engineer Albert Barkmann reported an open-market sale of common stock.

Rhea-AI Filing Summary

Diamondback Energy, Inc. Executive Vice President and Chief Engineer Albert Barkmann reported an open-market sale of common stock. He sold 3,000 shares at a weighted average price of $204.0375 per share, in multiple trades between $204.00 and $204.07 per share. Following this transaction, he directly holds 24,571 shares of Diamondback Energy common stock.

Insights

Equity compensation and insider trading analyst

Small open-market sale by an executive, with substantial holdings retained.

Executive Vice President and Chief Engineer Albert Barkmann executed an open-market sale of 3,000 shares of Diamondback Energy common stock at a weighted average price of $204.0375 per share. The trade was executed across a tight range of prices from $204.00 to $204.07.

After this transaction, Barkmann still directly holds 24,571 shares, indicating he retains a meaningful equity stake. The filing describes a straightforward open-market sale with no derivative exercises, gifts, or tax-withholding events, suggesting a routine liquidity move rather than a complex restructuring.

There is no reference to a Rule 10b5-1 trading plan in the provided footnote, and no derivative positions are listed in the derivative summary. Subsequent company filings may provide additional context on future insider activity or changes in equity-based compensation.

Insider Trade Summary

Net Seller: 3,000 shares

Net Sell 1 txn

Insider Barkmann Albert

Role Exec. VP and Chief Engineer

Sold 3,000 shs ($612K)

Type	Security	Shares	Price	Value
Sale	Common Stock	3,000	$204.0375	$612K

Holdings After Transaction: Common Stock — 24,571 shares (Direct)

Footnotes (1)

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 $204.00 per share to $204.07 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.

Key Figures

Shares sold: 3,000 shares Weighted average sale price: $204.0375 per share Post-transaction holdings: 24,571 shares +2 more

5 metrics

Shares sold 3,000 shares Open-market sale of Diamondback Energy common stock

Weighted average sale price $204.0375 per share Average price for 3,000 shares sold

Post-transaction holdings 24,571 shares Direct ownership after the sale

Sale price range low $204.00 per share Lowest price in reported trade range

Sale price range high $204.07 per share Highest price in reported trade range

Key Terms

open-market sale, weighted average sale price, Form 4, non-derivative

4 terms

open-market sale financial

"The transaction_action field describes the event as an open-market sale."

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.

weighted average sale price financial

"The price reported is a weighted average sale price across multiple trades."

Form 4 regulatory

"INSIDER FILING DATA (Form 4): describes the insider transaction report."

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.

non-derivative financial

"The transaction_type is listed as non-derivative for this common stock sale."

FAQ

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

What did Diamondback Energy (FANG) executive Albert Barkmann report in this Form 4?

Albert Barkmann reported an open-market sale of Diamondback Energy common stock. He sold 3,000 shares at a weighted average price of $204.0375 per share across multiple trades, and after these sales he directly holds 24,571 shares of Diamondback Energy common stock.

How many Diamondback Energy (FANG) shares did Albert Barkmann sell and at what price?

Albert Barkmann sold 3,000 shares of Diamondback Energy common stock. The filing states a weighted average sale price of $204.0375 per share, with individual trades executed in a narrow price range between $204.00 and $204.07 per share.

How many Diamondback Energy (FANG) shares does Albert Barkmann own after this transaction?

Following the reported sale, Albert Barkmann directly holds 24,571 shares of Diamondback Energy common stock. This figure reflects his remaining direct ownership after selling 3,000 shares in the open market, as shown in the post-transaction holdings column in the Form 4 data.

What type of transaction did Albert Barkmann report for Diamondback Energy (FANG)?

The Form 4 identifies Barkmann’s activity as an open-market sale of common stock, coded “S.” This indicates a sale in the market or a private transaction, rather than an option exercise, gift, tax withholding event, or internal restructuring of his Diamondback Energy equity position.

Did the Diamondback Energy (FANG) Form 4 mention derivative securities for Albert Barkmann?

The filing’s derivative summary section is empty for this report. That means no options, warrants, or other derivative securities transactions were disclosed in this specific Form 4, and only a non-derivative common stock sale of 3,000 shares was reported for Barkmann.

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

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Accepted by SEC EDGAR 05/19/2026 - 04:09 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^*

Barkmann Albert

(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)
	Exec. VP and Chief Engineer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/15/2026

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	05/15/2026		S		3,000	D	$204.0375(1)	24,571	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 $204.00 per share to $204.07 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.

Remarks:

	/s/ Matt Zmigrosky, as attorney-in-fact for Albert Barkmann	05/19/2026
	** 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)