Current position

Tom Russo’s Martin Marietta Matls Inc (MLM) position

Reported position history, portfolio importance and verified filing changes from public SEC disclosures.

Gardner Russo & Quinn · formerly Gardner Russo & GardnerVerified through Q2 2026
Relationship snapshot

At a glance

The full verified relationship, including prior ownership episodes and exits where supported.

First reportedQ1 2007Earliest verified positive filing snapshot
Latest statusCurrent positionBased on the latest supported relationship state
Peak shares2.10MHighest verified quarter-end share count
Quarters reported71Verified quarters with shares above zero
What happened?

Gardner Russo & Quinn · formerly Gardner Russo & Gardner first reported Martin Marietta Matls Inc in Q1 2007. After an earlier exit, the position later appeared again in a verified filing. The reported position was increased and reduced across later filings. Gardner Russo & Quinn · formerly Gardner Russo & Gardner currently reports 705.37K shares. The latest verified filing showed: Sold 1.4% of the position.

Verified SEC history

Position over time

See the same verified relationship through reported shares, portfolio weight or reported value.

Metric

Gaps indicate periods that cannot be safely connected or where a verified corporate action changes the raw share scale. Stock price, when available, is market context and not a transaction price.

Key filing events

What changed

Latest filing plus the most meaningful reported changes. Unchanged quarters are collapsed by default.

Q2 2026
Sold 1.4% of the position−10.04K shares · 705.37K shares remained
Filing context

Quarter-end price $576.70 · Estimated holding basis $299.99

Q1 2026
Sold 1.5% of the position−11.20K shares · 715.41K shares remained
Filing context

Quarter-end price $588.68 · Estimated holding basis $299.99

Q4 2025
Bought 5.7% more+39.08K shares · 726.61K shares reported after the change
Filing context

Quarter-end price $622.66 · Estimated holding basis $299.99

Q3 2025
Sold 3.5% of the position−25.24K shares · 687.54K shares remained
Filing context

Quarter-end price $630.28 · Estimated holding basis $281.65

Q2 2025
Sold 0.2% of the position−1.47K shares · 712.78K shares remained
Filing context

Quarter-end price $548.96 · Estimated holding basis $281.65

Q1 2025
Bought 1.0% more+7.24K shares · 714.25K shares reported after the change
Filing context

Quarter-end price $478.13 · Estimated holding basis $281.65

Portfolio importance

How important is Martin Marietta Matls Inc in Gardner Russo & Quinn · formerly Gardner Russo & Gardner’s reported portfolio?

Relative importance is measured only within the verified primary non-option reported portfolio for each quarter.

Current portfolio weight4.6%Q2 2026
Current rank#11of 85 reported positions
Peak portfolio weight9.5%Q4 2008
Best historical rank#3Q4 2008
At peak importanceQ4 2008
MLM
9.5%
Largest holding
17.3%
Cross-investor discovery

Who else owns Martin Marietta Matls Inc?

Also reported by 2 other tracked investors in their latest verified filings.

Chris HohnTCI Fund Management Ltd
MLM1.4% of reported portfolio
Joel GreenblattGotham Asset Management
MLM0.0% of reported portfolio
Explore Martin Marietta Matls Inc across all tracked investors →
SEC evidence & methodology

SEC filing evidence

Market context and filing-derived values are kept separate from actual transaction prices, which 13F filings do not disclose.

Latest verified stock price$490.642026-09-18

Market context only; not an investor transaction price.

Latest filing quarter-end price$576.70Q2 2026

Derived from validated reported value and shares where supported.

Estimated holding basis$299.99Historical reference — not actual purchase price

Calculated from supported filing history.

Latest verified investor filingQ2 2026 · filed 2026-08-13
Open SEC filing ↗

This tracker follows the current SEC filer, Gardner Russo & Quinn LLC (formerly Gardner Russo & Gardner), not Tom Russo’s personal brokerage account. Form 13F reports quarter-end U.S.-listed positions and certain options, but it does not reveal exact trade dates, execution prices, short positions or the purpose of an option position.