Diamondback director awarded 982 RSUs

Mains Stephanie K. reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Mains Stephanie K. reported acquisition or exercise transactions in this Form 4 filing.

Diamondback Energy, Inc. director Stephanie K. Mains received a grant of 982 restricted stock units, each representing one share of common stock, as an annual non-employee director award under the company’s equity incentive plan. These units vest on the earlier of one year from grant or the 2027 annual stockholders’ meeting. Following this equity award, she directly holds 11,635 shares of common stock.

Insider Trade Summary

Grant/Award: 982 shares

Grant/Award 1 txn

Insider Mains Stephanie K.

Role Director

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

Holdings After Transaction: Common Stock — 11,635 shares (Direct)

Footnotes (1)

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 Ms. Mains 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.

Key Figures

RSUs granted: 982 restricted stock units Shares after transaction: 11,635 shares Grant vesting horizon: 2027

3 metrics

RSUs granted 982 restricted stock units Annual non-employee director grant

Shares after transaction 11,635 shares Total direct holdings after award

Grant vesting horizon 2027 Vest by one year from grant or 2027 annual meeting

Key Terms

restricted stock units, equity incentive plan, annual non-employee director grant

3 terms

restricted stock units financial

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

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

"granted to Ms. Mains 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 non-employee director grant financial

"These restricted stock units were granted to Ms. Mains as an annual non-employee director grant"

FAQ

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

What did Diamondback Energy (FANG) director Stephanie K. Mains receive in this Form 4?

Stephanie K. Mains received 982 restricted stock units, each convertible into one share of Diamondback Energy common stock. This award is part of her annual compensation as a non-employee director under the company’s equity incentive plan, with no cash purchase involved.

How many Diamondback Energy shares does Stephanie K. Mains hold after this transaction?

After this equity award, Stephanie K. Mains directly holds 11,635 shares of Diamondback Energy common stock. This total includes the impact of the 982 newly granted restricted stock units reported, reflecting her updated direct ownership position as disclosed in the Form 4 filing.

What are the vesting terms of the 982 restricted stock units granted by Diamondback Energy?

The 982 restricted stock units vest on the earlier of the one-year anniversary of the grant date or the date of Diamondback Energy’s 2027 annual meeting of stockholders. Vesting must occur before the units convert into shares that Ms. Mains can receive.

Is the 982-share grant to Stephanie K. Mains an open-market purchase of Diamondback Energy stock?

No, the 982-share grant is not an open-market purchase. It is a compensation-related grant of restricted stock units awarded at no cash cost, as part of Ms. Mains’ annual non-employee director compensation under Diamondback Energy’s equity incentive plan.

How is the 982 RSU grant to Stephanie K. Mains structured in terms of underlying Diamondback Energy stock?

Each of the 982 restricted stock units represents a contingent right to receive one share of Diamondback Energy common stock. The units only convert into shares once the specified vesting condition is met, aligning director compensation with shareholder interests over time.

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^*

Mains Stephanie K.

(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	11,635	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 Ms. Mains 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.

Remarks:

	/s/ Matt Zmigrosky, as attorney-in-fact for Stephanie K. Mains	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)