Martin Marietta (NYSE: MLM) COO granted 8,101 stock units

Rhea-AI Filing Summary

Samborski Christopher William reported acquisition or exercise transactions in this Form 4 filing.

Martin Marietta Materials executive Christopher William Samborski, EVP and COO, reported an equity grant. On May 1, he received 8,101 shares of Common Stock through a restricted stock unit award at a stated price of $0.00 per share.

Following this award, his directly held Common Stock position increased to 21,762 shares. The restricted stock unit award was granted under the Martin Marietta Materials, Inc. Amended and Restated Stock-Based Award Plan and vests pro rata in three equal installments on the sixth, seventh, and eighth anniversaries of the award date, subject to continued employment and other conditions in the award agreement.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Samborski Christopher William

Role EVP, COO

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	8,101	$0.00	--

Holdings After Transaction: Common Stock — 21,762 shares (Direct, null)

Footnotes (1)

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Key Figures

RSU award size: 8,101 shares Post-grant holdings: 21,762 shares Vesting installments: 3 installments

3 metrics

RSU award size 8,101 shares Restricted stock unit grant of Common Stock on May 1

Post-grant holdings 21,762 shares Direct Common Stock ownership after the transaction

Vesting installments 3 installments Equal vesting on 6th, 7th and 8th anniversaries of award date

Key Terms

Restricted stock unit award, Amended and Restated Stock-Based Award Plan, vests pro rata

3 terms

Restricted stock unit award financial

"Restricted stock unit award granted under the Martin Marietta Materials, Inc."

A restricted stock unit award is a promise by a company to give an employee a specified number of company shares at a future date if certain conditions are met, such as staying with the company or hitting performance goals. For investors, these awards matter because they can increase the total number of shares outstanding when converted, diluting existing holders, and they align employees’ incentives with shareholders’ interests much like giving a rising bonus that becomes real only after conditions are satisfied.

Amended and Restated Stock-Based Award Plan financial

"granted under the Martin Marietta Materials, Inc. Amended and Restated Stock-Based Award Plan"

vests pro rata financial

"which award vests pro rata in three equal installments on the sixth, seventh and eighth anniversaries"

Form 4 Insider Transactions: What Each Field Means →

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^*

Samborski Christopher William

(Last) (First) (Middle)

4123 PARKLAKE AVE

(Street)

RALEIGH NORTH CAROLINA 27612

(City) (State) (Zip)

UNITED STATES

(Country)

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, COO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/01/2026

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	05/01/2026		A		8,101(1)	A	$0	21,762	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. Restricted stock unit award granted under the Martin Marietta Materials, Inc. Amended and Restated Stock-Based Award Plan, which award vests pro rata in three equal installments on the sixth, seventh and eighth anniversaries of the award date, subject to continued employment and other terms and conditions specified in the award agreement.

	/s/ Sara W. Brown, attorney-in-fact	05/05/2026
	** 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)

FAQ

What insider transaction did Martin Marietta (MLM) EVP Christopher Samborski report?

Christopher William Samborski reported receiving 8,101 shares of Common Stock through a restricted stock unit award. The grant is recorded at a stated price of $0.00 per share and represents compensation rather than an open-market stock purchase or sale.

How many Martin Marietta (MLM) shares does Christopher Samborski hold after this Form 4?

After the reported restricted stock unit award, Christopher Samborski directly holds 21,762 shares of Martin Marietta Common Stock. This total reflects his position following the 8,101-share grant disclosed in the Form 4 insider transaction report.

What is the vesting schedule for Christopher Samborski’s new Martin Marietta RSU award?

The restricted stock unit award vests pro rata in three equal installments. Vesting occurs on the sixth, seventh, and eighth anniversaries of the award date, and is subject to continued employment and additional terms and conditions specified in the award agreement.

Is Christopher Samborski’s Martin Marietta Form 4 an open‑market buy or sell of MLM stock?

The filing reports a grant classified as a “Grant, award, or other acquisition,” not an open‑market trade. The 8,101 shares of Common Stock were received at a stated price of $0.00 per share as a restricted stock unit award under the company’s stock‑based plan.

Under which plan was the Martin Marietta (MLM) restricted stock unit award to Christopher Samborski granted?

The award was granted under the Martin Marietta Materials, Inc. Amended and Restated Stock‑Based Award Plan. This plan governs the terms of equity‑based compensation awards, including the restricted stock unit grant disclosed in Samborski’s Form 4 filing.