FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * LNA Holding SRL (Last) (First) (Middle) C/O LHOIST GROUP, RUE CHARLES DUBOIS 28 (Street) LIMELETTE BE - 1342 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 08/21/2026	3. Issuer Name and Ticker or Trading Symbol MARTIN MARIETTA MATERIALS INC [ MLM ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	10,953,543	I	See Footnote (1)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. LNA Holding SRL ("LNH") is the record holder of 10,953,543 shares of Common Stock. LNH is a wholly owned subsidiary of Kalk en Dolomiet Maatschappij SA, which is a direct and indirect subsidiary of Financiere de Gestions Internationales SCA ("FGI"). GPI SA is the statutory manager of FGI. As a result, each of the foregoing entities may be deemed to share beneficial ownership of the Common Stock held directly by LNH. GPI SA is managed by a board of directors comprised of Jean-Pierre Berghmans, Elisabeth van der Vaeren, Pascal Rakovsky and Rene Beltjens (acting through its management company Paradocs Ter Sarl), each of whom disclaims beneficial ownership of the Common Stock beneficially owned by FGI.

	LNA Holding SRL By: /s/ Frederic Meessen, Proxy Holder	08/24/2026
	** Signature of Reporting Person	Date
	Kalk en Dolomiet Maatschappij SA By: /s/ Philippe Vauthier, Managing-Director	08/24/2026
	** Signature of Reporting Person	Date
	Financiere de Gestions Internationales SCA By: /s/ Philippe Vauthier, Delegate to the Daily Management	08/24/2026
	** Signature of Reporting Person	Date
	GPI SA By: /s/ Philippe Vauthier, Delegate to the Daily Management	08/24/2026
	** 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).
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