MLM · Martin Marietta Materials · Form 13F filings for Q2 2026
Martin Marietta Materials
4 of 76 investors hold it
Together they reported $1.2 billion of it. In Q2 2026, 2 added and 0 reduced.
20 of 83 tracked investors have filed for Q3 2026 so far. The sheet and every stock page stay on Q2 2026 until most have filed, so each count is taken from one group of investors.
Who added and who reduced
Q2 2026 against Q1 2026, among 74 filings that can be compared. An investor counts as adding or reducing when reported shares change by 20% or more, or when a position is opened or closed.
2added or opened
0reduced or sold out
Who holds it
| Investor | Share of their portfolio | Reported value | This quarter |
|---|---|---|---|
| Thomas Russo | 4.56% | $407M | No change of 20% |
| Wallace Weitz | 1.89% | $27M | No change of 20% |
| Chris Hohn | 1.44% | $758M | New position |
| Joel Greenblatt | 0.05% | $21M | +66.9% |
Holders over time
How many of the same 76 investors reported a position at each quarter end, up to Q2 2026.
Where to next
Source: SEC Form 13F filings for Q2 2026, the quarter ended Jun 30, 2026, from the 76 investors on the homepage sheet · CUSIP 573284106 · data as of Nov 12, 2026. Weight is the share of the investor’s disclosed portfolio. Filings list long US-listed positions at quarter end. They are not live holdings, omit shorts, can be amended and give no reasons for a change.
Each investor’s filing
- Thomas Russo · filed Aug 13, 2026 Filing in the portfolio
- Wallace Weitz · filed Aug 12, 2026 Filing in the portfolio
- Chris Hohn · filed Aug 14, 2026 Form 13F 0001647251-26-000007 ↗
- Joel Greenblatt · filed Aug 14, 2026 Form 13F 0001398344-26-014644 ↗