MLM

Martin Marietta Materials

13 superinvestors own MLM

Based on latest 13F filings — data is 45–90 days delayed

Investor	Fund	Weight	Shares	Value	Quarter	Activity
Thomas Russo	Gardner Russo & Quinn	4.96%	715,411	$421.1M	2026Q1	Reduced
Chase Coleman	Tiger Global Management	3.77%	535,700	$86.8M	2007Q2	Reduced
Ruane Cunniff	Sequoia Fund	2.90%	2,727,604	$227.9M	2010Q1	Reduced
Wallace Weitz	Weitz Investment Management	1.63%	39,775	$23.4M	2026Q1	Reduced
John Armitage	Egerton Capital	0.91%	165,338	$79.1M	2025Q1	Added
Mario Cibelli	Marathon Partners	0.83%	12,500	$2.0M	2016Q1	Reduced
Thomas Gayner	Markel Group	0.57%	150,870	$8.1M	2004Q4	Reduced
Mason Hawkins	Longleaf Partners – Southeastern Asset Management	0.51%	1,039,807	$103.9M	2013Q4	Reduced
FPA / Steven Romick	FPA Crescent Fund – First Pacific Advisors	0.45%	291,000	$11.3M	2002Q2	Held
Christopher Davis	Davis Selected Advisers	0.28%	716,959	$94.7M	2014Q2	Reduced
Bill Nygren	Oakmark Select Fund – Harris Associates	0.15%	0	$185.1M	2011Q4	Held
Kenneth Fisher	Fisher Asset Management	0.00%	368	$217K	2026Q1	Added
First Eagle Investment Management	First Eagle Investment Management	0.00%	111	$43K	2022Q1	Added

Open-market purchases (P) and sales (S) from SEC Form 4 filings · last 12 months

No open-market insider trades in the last 12 months.

Form 4 filings for option exercises and other transaction types are excluded.

STOCK Act disclosures · last 12 months

Congressional trade data coming soon.

We are sourcing STOCK Act disclosures and will display them here shortly.

What Is SEC Form 4?

Understand the insider trade filings behind MLM activity.

What Is a 13F Filing?

How superinvestors disclose their quarterly holdings.

Insider Cluster Buying

Why multiple insiders buying together is a strong signal.

Superinvestor Consensus

The most widely held stocks across all tracked institutions.