MLM (Martin Marietta Materials)
Insider Trading Activity
Every open-market purchase and sale reported by MLM officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-25 | Philipp Niemann | Director | A | — | — |
| 2026-08-04 | Michael J Petro | SVP and CFO | F | — | — |
| 2026-06-02 | MARTIN J LYONS | Director | A | — | — |
| 2026-06-02 | Thomas Pike | Director | A | — | — |
| 2026-06-02 | DAVID C WAJSGRAS | Director | A | — | — |
| 2026-05-18 | Dorothy M Ables | Director | A | — | — |
| 2026-05-18 | GAYLA J DELLY | Director | A | — | — |
| 2026-05-18 | Anthony R Foxx | Director | A | — | — |
| 2026-05-18 | MARTIN J LYONS | Director | A | — | — |
| 2026-05-18 | Mary T Mack | Director | A | — | — |
| 2026-05-18 | LAREE E PEREZ | Director | A | — | — |
| 2026-05-18 | Thomas Pike | Director | A | — | — |
| 2026-05-18 | DONALD W SLAGER | Director | A | — | — |
| 2026-05-18 | DAVID C WAJSGRAS | Director | A | — | — |
| 2026-05-05 | Christopher William Samborski | EVP, COO | A | — | — |
| 2026-03-03 | Donald A. McCunniff | EVP and CHRO | A | — | — |
| 2026-03-03 | C Howard Nye | Chairman, Pres & CEO | A | — | — |
| 2026-03-03 | Michael J Petro | SVP and CFO | A | — | — |
| 2026-03-03 | George Frederick Schoen | EVP, GC and Corp. Secretary | A | — | — |
| 2026-03-02 | JOHN J KORALESKI | Director | A | — | — |
| 2026-03-02 | Thomas Pike | Director | A | — | — |
| 2026-03-02 | DAVID C WAJSGRAS | Director | A | — | — |
| 2026-02-25 | Robert J Cardin | SVP, Controller & CAO | F | — | — |
| 2026-02-25 | Jason Paul Flynn | SVP and CIO | F | — | — |
| 2026-02-25 | Donald A. McCunniff | EVP and CHRO | F | — | — |
| 2026-02-25 | C Howard Nye | Chairman, Pres & CEO | F | — | — |
| 2026-02-25 | Michael J Petro | SVP and CFO | F | — | — |
| 2026-02-24 | Robert J Cardin | SVP, Controller & CAO | A | — | — |
| 2026-02-24 | Jason Paul Flynn | SVP and CIO | A | — | — |
| 2026-02-24 | Donald A. McCunniff | EVP and CHRO | A | — | — |
| 2026-02-24 | C Howard Nye | Chairman, Pres & CEO | A | — | — |
| 2026-02-24 | Michael J Petro | SVP and CFO | A | — | — |
| 2026-02-19 | Robert J Cardin | SVP, Controller & CAO | MIXED | — | — |
| 2026-02-19 | C Howard Nye | Chairman, Pres & CEO | MIXED | — | — |
| 2026-02-19 | Jason Paul Flynn | SVP and CIO | MIXED | — | — |
| 2026-02-19 | Michael J Petro | SVP and CFO | MIXED | — | — |
| 2025-12-17 | ROSELYN R BAR | Executive Vice President | F | — | — |
| 2025-12-17 | Robert J Cardin | SVP, Controller & CAO | F | — | — |
| 2025-12-17 | Donald A. McCunniff | EVP and CHRO | F | — | — |
| 2025-12-17 | C Howard Nye | Chairman, Pres & CEO | F | — | — |
| 2025-12-03 | ROSELYN R BAR | Executive Vice President | MIXED | — | — |
| 2025-12-03 | Jason Paul Flynn | SVP and CIO | F | — | — |
| 2025-12-01 | JOHN J KORALESKI | Director | A | — | — |
| 2025-12-01 | Thomas Pike | Director | A | — | — |
| 2025-12-01 | DAVID C WAJSGRAS | Director | A | — | — |
| 2025-09-02 | JOHN J KORALESKI | Director | A | — | — |
| 2025-09-02 | Thomas Pike | Director | A | — | — |
| 2025-09-02 | DAVID C WAJSGRAS | Director | A | — | — |
| 2025-08-11 | LAREE E PEREZ | Director | Sell | — | — |
| 2025-07-09 | Michael J Petro | SVP and CFO | A | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | 10%+ Owner | 5,381,235 | — |
| — | 10%+ Owner | 5,181,235 | — |
| — | 10%+ Owner | 5,082,564 | — |
| — | 10%+ Owner | 4,709,835 | — |
| — | 10%+ Owner | 3,696,132 | — |
| — | Chairman, Pres & CEO | 246,438 | — |
| — | Executive Vice President | 62,594 | — |
| — | Exec. VP | 60,601 | — |
| — | EVP and CFO | 59,786 | — |
| — | Sr. VP | 49,445 | — |
| — | Exec VP | 47,500 | — |
| — | SVP Human Resources | 40,073 | — |
| — | EVP and CFO | 26,643 | — |
| — | Director | 24,644 | — |
| — | EVP, GC and Corp. Secretary | 23,673 | — |
| — | Director | 23,576 | — |
| — | Executive VP | 22,301 | — |
| — | SVP/Controller/CAO | 22,027 | — |
| — | EVP, COO | 21,762 | — |
| — | Director | 21,306 | — |
| — | SVP - Strategy and Development | 19,065 | — |
| — | Director | 17,874 | — |
| — | Director | 17,869 | — |
| — | Director | 17,775 | — |
| — | Director | 17,026 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the MLM quote page; the site-wide leaderboard is on the insider transactions hub.