# Martin Marietta Materials Ord (MLM): who owns it

3 value investors held Martin Marietta Materials Ord in their Q3 2026 13F, led by Gardner Russo & Quinn, Weitz Investment Management, TCI Fund Management.

## 13F holders

| Manager | Portfolio | Value | Change | Quarters held |
| --- | --- | --- | --- | --- |
| Gardner Russo & Quinn | 4.6% | $407m | Trimmed -1.4% | 53 |
| Weitz Investment Management | 1.9% | $27.3m | Added +19% | 36 |
| TCI Fund Management | 1.4% | $758m | New | 1 |

## Fund holders

| Fund | Manager | Weight | Value | As at |
| --- | --- | --- | --- | --- |
| Weitz Partners Value Fund | Weitz Investment Management | 3.6% | $18.0m | 2026-06-30 |
| Weitz Large Cap Equity Fund | Weitz Investment Management | 0.7% | $4.0m | 2026-06-30 |

Source: SEC filings, via moatshark (https://www.moatshark.com/s/mlm). Values traded and returns are estimates. Not investment advice. Built 2026-10-21.