Matador Resources (MTDR) insider filing: 150-share purchase and 10,000-share disposition

Rhea-AI Filing Summary

Matador Resources insider transaction summary: William D. Lambert, EVP and CFO of Matador Resources Co (MTDR), reported a purchase and a disposition of common stock. On 09/12/2025 he purchased 150 shares at a price of $48.04 per share, recorded as an acquisition that leaves 650 shares beneficially owned indirectly (held of record by his IRA). The filing also reports a disposition of 10,000 shares. The form explains 10,000 restricted shares were granted to the reporting person on 05/05/2025 that vest in equal annual installments over three years.

Positive

• Purchase disclosed: Reporting person acquired 150 shares at $48.04, a transparent open-market transaction
• Restricted grant disclosed: 10,000 restricted shares were granted on 05/05/2025 with a clear vesting schedule

Negative

• Disposition reported: A disposal of 10,000 shares is recorded on the Form 4
• No explanation in form: The filing does not state whether the 10,000-share disposition is related to the restricted grant or another reason

Insights

Financial Analyst

TL;DR: Small open-market purchase and a reported 10,000-share disposition alongside a noted restricted stock grant.

The reporting shows a purchase of 150 shares at $48.04, increasing reported indirect holdings to 650 shares held in an IRA. Separately, the Form 4 records a disposition of 10,000 shares and discloses that 10,000 restricted shares were granted on 05/05/2025 that vest over three years. From a trading-impact perspective, the 150-share purchase is immaterial to company capitalization. The 10,000-share disposition and the restricted-share disclosure are material to the reporting person's personal holdings but the filing provides no context on whether the disposition relates to the restricted award, tax planning, or other purposes, so no inference about company fundamentals can be drawn from this form alone.

Corporate Governance Expert

TL;DR: Officer-level filing documents both compensation-related restricted shares and subsequent insider trades.

The Form 4 properly identifies William D. Lambert as EVP and CFO and discloses equity movements: a grant of 10,000 restricted shares with a three-year vesting schedule and reported transactions on 09/12/2025 including a purchase of 150 shares and a 10,000-share disposition. The disclosure of the restricted grant and vesting schedule meets standard reporting expectations. The filing is signed by an attorney-in-fact and dated 09/15/2025, consistent with procedural requirements. The report lacks additional narrative linking the disposition to the grant or a trading plan, so it is a routine insider filing without governance red flags based solely on the provided text.

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^*

Lambert William D

(Last) (First) (Middle)

5400 LBJ FREEWAY

SUITE 1500

(Street)

DALLAS TX 75240

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Matador Resources Co [ MTDR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP and CFO

3. Date of Earliest Transaction (Month/Day/Year)
09/12/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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	09/12/2025		P		150	A	$48.04	650	I	Represents shares held of record by the reporting person's Individual Retirement Account
Common Stock								10,000(1)	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. Includes 10,000 shares of restricted stock granted to the reporting person on May 5, 2025 that vest in equal annual installments on the first, second and third anniversaries of the date of grant.

Remarks:

	/s/ William D. Lambert, by Cale L. Curtin as attorney-in-fact	09/15/2025
	** 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.

FAQ

What insider transactions did William D. Lambert report for MTDR?

The Form 4 shows a purchase of 150 shares at $48.04 on 09/12/2025 and a reported disposition of 10,000 shares.

How many Matador Resources (MTDR) shares does Lambert beneficially own after the reported purchase?

The filing reports 650 shares beneficially owned indirectly following the reported 150-share purchase.

Was there any equity compensation disclosed in this Form 4 for MTDR?

Yes. The filing states 10,000 restricted shares were granted on 05/05/2025 that vest in equal annual installments over three years.

Who signed the Form 4 for William D. Lambert?

The Form 4 is signed /s/ William D. Lambert, by Cale L. Curtin as attorney-in-fact and dated 09/15/2025.

Does the Form 4 explain why 10,000 shares were disposed?

No. The filing records the disposition of 10,000 shares but does not provide an explanation linking it to the restricted grant or other reasons.