Diamondback officer files notice to sell 1,326 shares

Form 144 for Diamondback Energy, Inc. discloses an officer’s planned Rule 144 sale of 1,326 shares and a prior 2,500-share sale in the last three months.

Rhea-AI Filing Summary

Diamondback Energy, Inc. (FANG) is the issuer of common stock that an officer, Matt Zmigrosky, has notified for potential resale under Rule 144. The notice covers 1,326 shares of common stock to be sold through Charles Schwab & Co., Inc., with the shares originating from a restricted stock lapse on September 10, 2025 and designated as equity compensation. The filing also lists a prior sale of 2,500 shares of Diamondback Energy, Inc. common stock by Matt Zmigrosky on August 14, 2026 within the past three months.

Key Figures

Planned shares to be sold: 1,326 shares Shares sold in past three months: 2,500 shares Acquisition date of shares to be sold: September 10, 2025 +2 more

5 metrics

Planned shares to be sold 1,326 shares Common stock of Diamondback Energy, Inc. covered by the Rule 144 notice

Shares sold in past three months 2,500 shares Common stock of Diamondback Energy, Inc. sold on August 14, 2026

Acquisition date of shares to be sold September 10, 2025 Date of Restricted Stock Lapse for 1,326 shares categorized as equity compensation

Broker for planned sale Charles Schwab & Co., Inc. Listed as broker for the 1,326 shares of common stock

Filing signature date September 15, 2026 Date of signature by Matt Zmigrosky on the notice

Key Terms

Rule 144, Restricted Stock Lapse, Equity Compensation, Securities To Be Sold

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Lapse financial

"Common | 09/10/2025 | Restricted Stock Lapse | Diamondback Energy, Inc."

Equity Compensation financial

"1326 | 09/10/2025 | Equity Compensation"

Equity compensation is pay given to employees, executives or contractors in the form of company ownership—such as stock, stock options or restricted shares—rather than just cash. It matters to investors because it can align workers' incentives with shareholders (like paying someone in slices of the same pie they help grow), but it also increases the number of shares outstanding and company expenses, affecting ownership percentages and earnings per share.

Securities To Be Sold financial

"144: Securities To Be Sold"

FAQ

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

What does the Form 144 filing disclose for Diamondback Energy, Inc. (FANG)?

It discloses that officer Matt Zmigrosky has filed a notice under Rule 144 to potentially sell 1,326 shares of Diamondback Energy, Inc. common stock, and it lists a prior sale of 2,500 shares within the past three months.

How many FANG shares are covered by the planned Rule 144 sale?

The planned Rule 144 sale covers 1,326 shares of Diamondback Energy, Inc. common stock, to be sold through Charles Schwab & Co., Inc. as the broker listed in the notice.

What prior sales of FANG shares does this Form 144 report?

The notice reports that 2,500 shares of Diamondback Energy, Inc. common stock were sold on August 14, 2026 by Matt Zmigrosky, and this transaction is disclosed as securities sold during the past three months.

How were the FANG shares to be sold under this Form 144 acquired?

The 1,326 shares to be sold were acquired through a Restricted Stock Lapse on September 10, 2025, and the acquisition is categorized in the filing as Equity Compensation from Diamondback Energy, Inc.

Who is the person filing the Form 144 related to Diamondback Energy, Inc. (FANG)?

The person for whose account the securities are to be sold is Matt Zmigrosky, identified in the filing as an officer of Diamondback Energy, Inc. and the account holder for the reported Rule 144 transactions.

Which broker is listed for the planned sale of FANG shares in this Form 144?

The filing lists Charles Schwab & Co., Inc., located at 3000 Schwab Way, Westlake, Texas, as the broker for the 1,326 shares of Diamondback Energy, Inc. common stock to be sold under Rule 144.

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

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Available on EDGAR 09/15/2026 - 04:10 PM Accepted by SEC EDGAR 09/15/2026 - 04:09 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001767328
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Diamondback Energy, Inc.
SEC File Number	001-35700
Address of Issuer	500 WEST TEXAS AVENUE SUITE 100 MIDLAND TEXAS 79701
Phone	432-221-7400
Name of Person for Whose Account the Securities are To Be Sold	Zmigrosky Matt
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Charles Schwab & Co., Inc. 3000 Schwab Way Westlake TX 76262	1326	281848.00	280024353	09/15/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/10/2025	Restricted Stock Lapse	Diamondback Energy, Inc.			1326	09/10/2025	Equity Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Matt Zmigrosky 500 WEST TEXAS AVENUE SUITE 100 MIDLAND TX 79701	Diamondback Energy, Inc.	08/14/2026	2500	281848.00

144: Remarks and Signature

Remarks
Date of Notice	09/15/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	Matt Zmigrosky
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)