Power of Attorney for Christopher William Samborski

This filing is an Exhibit 24.1, a Power of Attorney document. It indicates that Sara W. Brown is acting as an attorney-in-fact for Christopher William Samborski. Mr. Samborski, identified by CIK 0002131980, holds the position of EVP, COO at MARTIN MARIETTA MATERIALS INC (MLM). His reporting address is 4123 PARKLAKE AVE, RALEIGH, NC 27612. The document specifies that he directly owns 13,661 shares of the company's Common Stock following a transaction on May 1, 2026. The signature date for this document is May 5, 2026.