MLM · Insider Trading
Martin Marietta Materials
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.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-02 | Thomas Pike | Director | A | +66 | +$34.23K |
| 2026-09-02 | Michael J Petro | SVP and CFO | A | +9,331 | — |
| 2026-09-02 | David C Wajsgras | Director | A | +78 | +$40.46K |
| 2026-09-02 | Martin J Lyons | Director | A | +68 | +$35.27K |
| 2026-08-25 | Philipp Niemann | Director | A | +337 | — |
| 2026-08-04 | Michael J Petro | SVP and CFO | F | −368 | −$199.56K |
| 2026-06-02 | Martin J Lyons | Director | A | +61 | +$35.48K |
| 2026-06-02 | Thomas Pike | Director | A | +59 | +$34.32K |
| 2026-06-02 | David C Wajsgras | Director | A | +69 | +$40.13K |
| 2026-05-18 | Dorothy M Ables | Director | A | +313 | — |
| 2026-05-18 | Gayla J Delly | Director | A | +313 | — |
| 2026-05-18 | Anthony R Foxx | Director | A | +313 | — |
| 2026-05-18 | Martin J Lyons | Director | A | +313 | — |
| 2026-05-18 | Mary T Mack | Director | A | +313 | — |
| 2026-05-18 | Laree E Perez | Director | A | +313 | — |
| 2026-05-18 | Thomas Pike | Director | A | +313 | — |
| 2026-05-18 | Donald W Slager | Director | A | +313 | — |
| 2026-05-18 | David C Wajsgras | Director | A | +313 | — |
| 2026-05-05 | Christopher William Samborski | EVP, COO | A | +8,101 | — |
| 2026-03-03 | Donald A. McCunniff | EVP and CHRO | A | +2,960 | — |
| 2026-03-03 | C Howard Nye | Chairman, Pres & CEO | A | +5,919 | — |
| 2026-03-03 | Michael J Petro | SVP and CFO | A | +2,960 | — |
| 2026-03-03 | George Frederick Schoen | EVP, GC and Corp. Secretary | A | +23,673 | — |
| 2026-03-02 | John J Koraleski | Director | A | +69 | +$46.68K |
| 2026-03-02 | Thomas Pike | Director | A | +47 | +$31.80K |
| 2026-03-02 | David C Wajsgras | Director | A | +56 | +$37.89K |
| 2026-02-25 | Robert J Cardin | SVP, Controller & CAO | F | −312 | −$214.65K |
| 2026-02-25 | Jason Paul Flynn | SVP and CIO | F | −207 | −$141.90K |
| 2026-02-25 | Donald A. McCunniff | EVP and CHRO | F | −192 | −$131.25K |
| 2026-02-25 | C Howard Nye | Chairman, Pres & CEO | F | −3,026 | −$2.08M |
| 2026-02-25 | Michael J Petro | SVP and CFO | F | −305 | −$209.74K |
| 2026-02-24 | Robert J Cardin | SVP, Controller & CAO | A | +658 | — |
| 2026-02-24 | Jason Paul Flynn | SVP and CIO | A | +1,187 | +$324.86K |
| 2026-02-24 | Donald A. McCunniff | EVP and CHRO | A | +1,277 | — |
| 2026-02-24 | C Howard Nye | Chairman, Pres & CEO | A | +8,621 | +$1.22M |
| 2026-02-24 | Michael J Petro | SVP and CFO | A | +931 | — |
| 2026-02-19 | Robert J Cardin | SVP, Controller & CAO | MIXED | +1,047 | −$547.89K |
| 2026-02-19 | C Howard Nye | Chairman, Pres & CEO | MIXED | +12,648 | −$6.48M |
| 2026-02-19 | Jason Paul Flynn | SVP and CIO | MIXED | +115 | −$71.32K |
| 2026-02-19 | Michael J Petro | SVP and CFO | MIXED | +966 | −$505.23K |
| 2025-12-17 | Roselyn R Bar | Executive Vice President | F | −66 | −$41.55K |
| 2025-12-17 | Robert J Cardin | SVP, Controller & CAO | F | −32 | −$20.14K |
| 2025-12-17 | Donald A. McCunniff | EVP and CHRO | F | −50 | −$31.47K |
| 2025-12-17 | C Howard Nye | Chairman, Pres & CEO | F | −298 | −$187.59K |
| 2025-12-03 | Roselyn R Bar | Executive Vice President | MIXED | −908 | −$258.40K |
| 2025-12-03 | Jason Paul Flynn | SVP and CIO | F | −123 | −$75.68K |
| 2025-12-01 | John J Koraleski | Director | A | +75 | +$46.74K |
| 2025-12-01 | Thomas Pike | Director | A | +51 | +$31.79K |
| 2025-12-01 | David C Wajsgras | Director | A | +61 | +$38.02K |
| 2025-09-02 | John J Koraleski | Director | A | +76 | +$46.85K |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| C Howard Nye | Chairman, Pres & CEO | 246,438 | $123.43M |
| Roselyn R Bar | Executive Vice President | 62,594 | $31.35M |
| James AJ Nickolas | EVP and CFO | 26,643 | $13.34M |
| Sue W Cole | Director | 24,644 | $12.34M |
| Michael J Petro | SVP and CFO | 24,321 | $12.18M |
| George Frederick Schoen | EVP, GC and Corp. Secretary | 23,673 | $11.86M |
| Christopher William Samborski | EVP, COO | 21,762 | $10.90M |
| Laree E Perez | Director | 15,730 | $7.88M |
| Robert J Cardin | SVP, Controller & CAO | 12,562 | $6.29M |
| John J Koraleski | Director | 10,822 | $5.42M |
| Donald A. McCunniff | EVP and CHRO | 7,518 | $3.77M |
| Jason Paul Flynn | SVP and CIO | 5,524 | $2.77M |
| Oliver W Brooks | SVP - Enterprise Excellence | 5,178 | $2.59M |
| David C Wajsgras | Director | 5,106 | $2.56M |
| Donald W Slager | Director | 5,064 | $2.54M |
| Thomas Pike | Director | 5,029 | $2.52M |
| Dorothy M Ables | Director | 4,221 | $2.11M |
| Bradley D Kohn | SVP, General Counsel and Secy | 3,625 | $1.82M |
| Anthony R Foxx | Director | 2,615 | $1.31M |
| Mary T Mack | Director | 914 | $457.77K |
| Martin J Lyons | Director | 442 | $221.37K |
| Philipp Niemann | Director | 337 | $168.78K |
| Gayla J Delly | Director | 313 | $156.76K |
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.
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.