Which superinvestors hold Martin Marietta Matls Inc (MLM)?

Per the latest SEC 13F filings, 1 superinvestor hold Martin Marietta Matls Inc (MLM): Wallace Weitz. Combined value held is about $23.4M, with Wallace Weitz the largest holder.

Martin Marietta Matls Inc

Held by 1 superinvestor (MLM). Valuation data coming soon.

Educational data only — not investment advice. 13F positions are self-reported and can lag up to 45 days.

TickerMLM

Holder count1

Total value held$23.4M

Largest holderWallace Weitz

External

Ownership overview

Martin Marietta Matls Inc (MLM) is held by 1 of the superinvestors tracked on Compounder, with a combined $23.4M in reported 13F value. The largest position belongs to Wallace Weitz, where it makes up 1.6% of the portfolio.

Over the latest quarter, 0 of the tracked filers opened a new position in MLM, 0 added to existing ones, 1 trimmed, and 0 sold out entirely.

Holder counts and values reflect the most recent SEC Form 13F filings, through the quarter ended 2026-03-31. Source: SEC EDGAR. A 13F shows only long US-listed positions and can lag the real portfolio by up to 45 days, so this is disclosed long ownership, not a complete picture.

Superinvestors Holding This Security

Investor	Value	Shares	Weight
Wallace Weitz	$23.4M	39,775	1.63%

Wallace Weitz
Value$23.4MShares39,775Weight1.63%

Stock valuation (intrinsic value / DCF) coming soon.

Sources· SEC EDGAR 13F as of 2026-05-14

Wallace Weitz

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