Diamondback director gets 982-share RSU grant

Plaumann Mark Lawrence reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Plaumann Mark Lawrence reported acquisition or exercise transactions in this Form 4 filing.

Diamondback Energy director Mark Plaumann received an equity grant of 982 restricted stock units, each representing one share of common stock. The award was granted as an annual non-employee director grant under the company’s equity incentive plan at no cash cost to him.

The restricted stock units will vest on the earlier of the one-year anniversary of the grant date and the 2027 annual meeting of stockholders. After this grant, Plaumann directly holds 13,937 shares of Diamondback Energy common stock.

Insider Trade Summary

Grant/Award: 982 shares

Grant/Award 1 txn

Insider Plaumann Mark Lawrence

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	982	$0.00	$0.00

Holdings After Transaction: Common Stock — 13,937 shares (Direct)

Footnotes (2)

1. F1. These securities are restricted stock units, each representing a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units were granted to Mr. Plaumann as an annual non-employee director grant under the issuer's equity incentive plan and will vest on the earlier of the one-year anniversary of the date of grant and the date of the 2027 annual meeting of stockholders of the issuer.
2. F2. Reflects the transfer of 7,688 shares of Common Stock in a transaction exempt from reporting pursuant to Rule 16a-13.

Key Figures

RSU grant size: 982 shares Holdings after transaction: 13,937 shares Grant price: $0.00 per share +1 more

4 metrics

RSU grant size 982 shares Annual non-employee director restricted stock unit award

Holdings after transaction 13,937 shares Total Diamondback Energy common stock held directly after grant

Grant price $0.00 per share Director equity award granted at no cash cost to recipient

Exempt transfer 7,688 shares Transfer of common stock referenced as exempt under Rule 16a-13

Key Terms

restricted stock units, equity incentive plan, annual meeting of stockholders, Rule 16a-13

4 terms

restricted stock units financial

"These securities are restricted stock units, each representing a contingent right to receive one share of common stock"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

equity incentive plan financial

"These restricted stock units were granted to Mr. Plaumann as an annual non-employee director grant under the issuer's equity incentive plan"

An equity incentive plan is a program that gives employees, executives or directors the right to receive company stock or options to buy stock as part of their pay. Think of it as offering slices of future company profit to motivate people to boost long‑term performance; for investors it matters because it can align employee goals with shareholder value but also increases the number of shares outstanding, which can dilute existing ownership.

annual meeting of stockholders financial

"will vest on the earlier of the one-year anniversary of the date of grant and the date of the 2027 annual meeting of stockholders"

Rule 16a-13 regulatory

"Reflects the transfer of 7,688 shares of Common Stock in a transaction exempt from reporting pursuant to Rule 16a-13"

FAQ

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

What did Diamondback Energy (FANG) director Mark Plaumann report on this Form 4?

Mark Plaumann reported receiving 982 restricted stock units as an annual non-employee director grant. Each unit represents one share of Diamondback Energy common stock, increasing his direct holdings to 13,937 shares after the award.

How many Diamondback Energy shares did Mark Plaumann acquire in this grant?

Mark Plaumann acquired 982 restricted stock units, each equal to one share of common stock. The grant was issued at no cash cost as part of his director compensation under Diamondback Energy’s equity incentive plan.

When do Mark Plaumann’s new Diamondback Energy restricted stock units vest?

The 982 restricted stock units vest on the earlier of the one-year anniversary of the grant date or the 2027 annual meeting of stockholders. This structure ties vesting to continued board service and the timing of the company’s annual meeting.

What are Mark Plaumann’s total Diamondback Energy holdings after this Form 4 transaction?

Following the grant of 982 restricted stock units, Mark Plaumann directly holds 13,937 shares of Diamondback Energy common stock. This total reflects his position after the reported acquisition in the Form 4 filing.

What does the Rule 16a-13 reference mean in Mark Plaumann’s Diamondback Energy filing?

The filing notes a transfer of 7,688 Diamondback Energy shares in a transaction exempt from reporting under Rule 16a-13. This means that specific transfer did not require standard Form 4 transaction reporting, although it is referenced in a footnote for transparency.

What type of security was granted to Mark Plaumann by Diamondback Energy?

Diamondback Energy granted Mark Plaumann restricted stock units, each representing a contingent right to receive one share of common stock. These awards form part of his annual non-employee director compensation under the company’s equity incentive plan.

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

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Accepted by SEC EDGAR 05/21/2026 - 05:57 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)
05/20/2026

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	05/20/2026		A		982(1)	A	$0	13,937(2)	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. These securities are restricted stock units, each representing a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units were granted to Mr. Plaumann as an annual non-employee director grant under the issuer's equity incentive plan and will vest on the earlier of the one-year anniversary of the date of grant and the date of the 2027 annual meeting of stockholders of the issuer.

2. Reflects the transfer of 7,688 shares of Common Stock in a transaction exempt from reporting pursuant to Rule 16a-13.

Remarks:

	/s/ Matt Zmigrosky, as attorney-in-fact for Mark L. Plaumann	05/21/2026
	** 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)