Martin Marietta Materials Inc filed 3 current reports with the SEC under Item 5.02, which covers directors and officers leaving or being appointed, the latest on 2026-08-24. Between them they name 3 people. Each change below is quoted from the filing and linked to it.
Every change, newest first
Appointed: Philipp Niemann, Director, effective 2026-08-21
Pursuant to the Shareholders Agreement, on August 21, 2026, the Board increased its size from ten to eleven directors and appointed Mr. Philipp Niemann, effective as of August 21, 2026, to fill the newly-created directorship.
Appointed: Michael J. Petro, Chief Financial Officer
On August 4, 2026, Martin Marietta Materials, Inc. (the "Company") announced that the Company has promoted Michael J. Petro to Executive Vice President, Chief Financial Officer.
Appointed: Christopher W. Samborski, Chief Operating Officer, effective 2026-05-01
On April 27, 2026, Martin Marietta Materials, Inc. (the "Company") announced that the Company has appointed Christopher W. Samborski, to serve as the Company's Executive Vice President and Chief Operating Officer, effective as of May 1, 2026 (the "Effective Date").
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Where this comes from
A public company must file a current report on Form 8-K with the SEC within four business days when a director leaves or is elected, or when its chief executive, chief financial, chief accounting or chief operating officer, or another named executive, departs or is appointed. That disclosure goes under Item 5.02 of the report.
Every change on this page is taken from one of those filings and quoted in the company's own words, with a link to the filing, so it can be checked at the source. Where a filing names the person, the role and the date a change takes effect, they are shown beside the quote. Where it does not, the quote stands on its own. A filing states what changed; it rarely states why, and neither does this page.