MARTIN MARIETTA MATERIALS (MLM) Institutional Ownership

MLM is currently held by 4 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $433.23M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.

The largest disclosed holder is Gardner Russo & Quinn, which reported ownership valued at approximately $421.15M in its March 31, 2026 13F filing. Based on current market prices and the latest disclosed share count, Gardner Russo & Quinn's MLM position is now estimated to be worth approximately $389.11M, representing an estimated loss of -7.61% since the filing period.

Major shareholders tracked on this page include Gardner Russo & Quinn, Sequoia Financial Advisors, Lountzis Asset Management, and other prominent asset managers. Collectively, these investors account for approximately 100% of the total disclosed value among the investors covered in this analysis.

This page tracks fund ownership trends, hedge fund exposure, portfolio concentration, historical 13F filings, and estimated holding performance to help investors analyze smart money sentiment toward MARTIN MARIETTA MATERIALS (MLM).