MARTIN MARIETTA MATERIALS (MLM) Institutional Ownership and Insiders Activity

MARTIN MARIETTA MATERIALS (MLM) is widely held by institutional investors, with 5 tracked firms reporting positions valued at approximately $1.20B based on SEC Form 13F filings for the quarter ended June 30, 2026.

TCI Fund Management is the largest disclosed holder, reporting approximately $758.42M in MLM holdings in its latest filing.

Institutional ownership among tracked investors remains highly concentrated, with TCI Fund Management representing the majority of disclosed value.

Recent insider activity includes 4 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.