MLM (MLM) HR executive uses shares to cover tax withholding

Rhea-AI Filing Summary

Martin Marietta Materials EVP and CHRO Donald A. McCunniff reported a tax-related share disposition under a benefit transaction. On February 23, 2026, he disposed of 192 shares of common stock at $683.60 per share to satisfy tax withholding obligations. After this transaction, his reported direct holdings totaled 4,558 shares of Martin Marietta Materials common stock.

Insider Trade Summary

Net Seller: 192 shares

Net Sell 1 txn

Insider McCunniff Donald A.

Role EVP and CHRO

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	192	$683.60	$131K

Holdings After Transaction: Common Stock — 4,558 shares (Direct)

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 02/25/2026 - 12:38 PM Learn about SEC filing dates

FAQ

What insider transaction did MLM executive Donald A. McCunniff report?

Donald A. McCunniff reported a tax-withholding disposition of Martin Marietta Materials common stock. He disposed of 192 shares at $683.60 per share to cover tax obligations, a non-open-market transaction typically tied to equity compensation or vesting.

How many MLM shares did Donald A. McCunniff dispose of for taxes?

He disposed of 192 shares of Martin Marietta Materials common stock. The transaction was coded “F”, indicating payment of tax liability by delivering securities, rather than a discretionary open-market sale by the executive.

At what price were the MLM shares used for McCunniff’s tax withholding?

The tax-withholding disposition used shares valued at $683.60 per share. This price is the transaction value applied to the 192 shares delivered to satisfy tax obligations related to his equity compensation in Martin Marietta Materials.

How many MLM shares does McCunniff hold after this Form 4 transaction?

Following the tax-withholding disposition, Donald A. McCunniff reported holding 4,558 shares of Martin Marietta Materials common stock. These shares are listed as direct ownership, reflecting his remaining stake after delivering shares for tax purposes.

What does transaction code “F” mean in Donald McCunniff’s MLM Form 4?

Transaction code “F” indicates payment of an exercise price or tax liability by delivering securities. For McCunniff, it reflects a tax-withholding disposition of shares, not an open-market buy or sell decision on the public stock market.

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^*

McCunniff Donald A.

(Last) (First) (Middle)

4123 PARKLAKE AVE

(Street)

RALEIGH NC 27612

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MARTIN MARIETTA MATERIALS INC [ MLM ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
02/23/2026

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	02/23/2026		F		192	D	$683.6	4,558	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:

	/s/ Sara W. Brown, attorney-in-fact	02/25/2026
	** 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.