MLM
Martin Marietta Materials
4 of the 83 super-investors we track hold MLM, worth a combined $1.21B per their latest 13F filings. The largest position: Thomas Russo at 4.6% of their portfolio. This quarter the cohort logged 1 buy and 0 sells on the name. Conviction score: 36 of 100 (how strongly the cohort backs it) — ranked #186 of 742 stocks. Conviction rising: 1 more super-investor hold it than in 2026Q1.
Why super-investors own MLM
MLM is held by 4 super-investors in our cohort, with a combined position value of $1.2B. The highest-conviction owner is Thomas Russo at 4.6% of their portfolio. Cohort ownership has grown from 3 to 4 over the last four quarters — net interest is rising. This quarter the cohort registered 1 new positions.
AI-synthesized from 13F filings. Not investment advice.
Cohort owners over time
2016Q3 → 2026Q2How many of the cohort members held this stock each quarter.
Owners (4) · click any column to sort
| #↑ | Manager | % Port. | History | Value | Shares |
|---|---|---|---|---|---|
| 1 | Chris Hohn | 1.4% | — 1q | $758M | 1,315,109 |
| 2 | Thomas Russo | 4.6% | 40q | $407M | 705,367 |
| 3 | Wallace Weitz | 1.9% | 36q | $27M | 47,370 |
| 4 | Joel Greenblatt | <0.1% | 40q | $15M | 25,897 |
Owners of MLM also hold
Congress is trading MLM
Congress tracker →- April McClain Delaneybought$15,001 - $50,000 · 2026-07-24
- April McClain Delaneybought$1,001 - $15,000 · 2026-07-20
- April McClain Delaneybought$1,001 - $15,000 · 2026-07-17
- April McClain Delaneybought$1,001 - $15,000 · 2026-05-28
- Josh Gottheimersold$15,001 - $50,000 · 2026-04-09
- April McClain Delaneybought$1,001 - $15,000 · 2026-03-09
STOCK Act periodic transaction reports; amounts are disclosed ranges. Who files late →
Recent activity (1)
| Manager | Move | % Port. | Δ Shares | Value | Filed |
|---|---|---|---|---|---|
| Chris Hohn | NEW | 1.4% | +100% | $758M | Aug 14, 2026 |
Long US equity 13F-HR filings only. CUSIP 573284106. Not investment advice.