Martin Marietta Materials Inc
MLM- Exchange
- NYSE
- Industry
- Mining & Quarrying of Nonmetallic Minerals (No Fuels)
- SEC CIK
- 0000916076
No open-market purchases or sales by Martin Marietta Materials Inc insiders were filed in the last 90 days; 1,079 institutions reported holding it in 13F filings for Q2 2026, worth $34.2B in total; 4 superinvestors hold it, including TCI Fund Management and Gardner Russo & Quinn.
Superinvestors holding MLM, Q2 2026
4 superinvestors report holding Martin Marietta Materials Inc on Form 13F, worth $1.39B in total. Weight is Martin Marietta Materials Inc's share of each 13F portfolio; actions compare shares with Q1 2026.
| Superinvestor | % of portfolio | Shares | Value | vs. previous quarter |
|---|---|---|---|---|
| TCI Fund ManagementChris Hohn | 1.4% | 1,315,109 | $758.4M | New |
| Gardner Russo & QuinnTom Russo | 4.6% | 705,367 | $406.8M | Reduced−1.4% |
| D1 Capital PartnersDan Sundheim | 0.6% | 345,060 | $199.0M | Added+6.9% |
| Weitz Investment ManagementWally Weitz | 1.9% | 47,370 | $27.3M | Added+19.1% |
Moves by quarter
Superinvestors that opened, added to, trimmed or sold out of MLM each quarter, comparing shares with the quarter before. A superinvestor that didn't file for a quarter isn't listed, and isn't counted as selling.
Q2 2026
4 superinvestors holding at quarter end
- New
- TCI Fund Management
- Added
- D1 Capital Partners (+6.9%), Weitz Investment Management (+19.1%)
- Reduced
- Gardner Russo & Quinn (−1.4%)
Q1 2026
3 superinvestors holding at quarter end
- New
- D1 Capital Partners
- Reduced
- Gardner Russo & Quinn (−1.5%), Weitz Investment Management (−3.6%)
Q4 2025
2 superinvestors holding at quarter end
- Added
- Gardner Russo & Quinn (+5.7%)
Q3 2025
2 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−3.5%)
Q2 2025
2 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−0.2%)
Q1 2025
2 superinvestors holding at quarter end
- Added
- Gardner Russo & Quinn (+1.0%), Weitz Investment Management (+1.5%)
Q4 2024
2 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−5.7%)
Q3 2024
2 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−1.8%)
Q2 2024
2 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−3.0%)
Q1 2024
2 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−16.3%), Weitz Investment Management (−17.5%)
Q4 2023
2 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−1.9%), Weitz Investment Management (−20.5%)
Q3 2023
2 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−1.5%), Weitz Investment Management (−6.2%)
Q2 2023
2 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−2.8%), Weitz Investment Management (−0.7%)
Q1 2023
2 superinvestors holding at quarter end
- Added
- Weitz Investment Management (+0.8%)
- Reduced
- Gardner Russo & Quinn (−0.9%)
Q4 2022
2 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−5.4%), Weitz Investment Management (−4.3%)
Q3 2022
2 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−1.1%)
Q2 2022
2 superinvestors holding at quarter end
- Added
- Weitz Investment Management (+2.7%)
- Reduced
- Gardner Russo & Quinn (−1.2%)
Q1 2022
2 superinvestors holding at quarter end
- Added
- Weitz Investment Management (+1.6%)
- Reduced
- Gardner Russo & Quinn (−6.5%)
Q4 2021
2 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−2.0%), Weitz Investment Management (−6.1%)
Q3 2021
2 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−3.5%)
Q2 2021
2 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−2.7%)