Last updated Aug 21, 2026
MARTIN MARIETTA MATERIALS INC (MLM) is a publicly traded company. This page tracks every superinvestor 13F holding, congressional stock trade, and Form 4 insider transaction in MLM. Across our datasets, 2 superinvestors hold MLM and 4 members of Congress have traded it.
Notable holders include Thomas Russo and Christopher Bloomstran. Active congressional traders include Ro Khanna, Michael McCaul, and Val Hoyle.
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