As of September 09, 2026, Martin Marietta Materials's top three insider holders are C Howard Nye (Chairman, Pres Ceo, 176.04K shares), C Howard Nye (Chairman, Pres Ceo, 176.04K shares), C Howard Nye (Chairman, Pres Ceo, 70.40K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | C Howard Nye | Chairman, Pres Ceo | 176,038 | 0 | 176,038 | 35.7% | 03 Mar, 2026 |
| 2 | Roselyn R Bar | Executive Vice President | 62,594 | 0 | 62,594 | 12.7% | 17 Dec, 2025 |
| 3 | James Aj Nickolas | Evp And Cfo | 26,643 | 0 | 26,643 | 5.4% | 25 Feb, 2025 |
| 4 | Michael J Petro | Svp And Cfo | 24,322 | 0 | 24,322 | 4.9% | 02 Sep, 2026 |
| 5 | George Frederick Schoen | Evp, Gc And Corp. Secretary | 23,673 | 0 | 23,673 | 4.8% | 03 Mar, 2026 |
| 6 | Christopher William Samborski | Evp, Coo | 21,762 | 0 | 21,762 | 4.4% | 05 May, 2026 |
| 7 | Michael J Quillen | Director | 21,306 | 0 | 21,306 | 4.3% | 10 May, 2024 |
| 8 | Sue W Cole | Director | 20,394 | 0 | 20,394 | 4.1% | 16 May, 2025 |
| 9 | Laree E Perez | Director | 15,730 | 0 | 15,730 | 3.2% | 18 May, 2026 |
| 10 | John P Mohr | Svp Cio | 14,974 | 0 | 14,974 | 3.0% | 05 Dec, 2023 |
| 11 | Robert J Cardin | Svp, Controller Cao | 12,459 | 0 | 12,459 | 2.5% | 25 Feb, 2026 |
| 12 | John J Koraleski | Director | 8,822 | 0 | 8,822 | 1.8% | 02 Mar, 2026 |
| 13 | Craig M Latorre | Sr. Vp, Chro | 8,634 | 0 | 8,634 | 1.8% | 05 Dec, 2023 |
| 14 | Donald A. Mccunniff | Evp And Chro | 7,518 | 0 | 7,518 | 1.5% | 03 Mar, 2026 |
| 15 | Jason Paul Flynn | Svp And Cio | 5,494 | 0 | 5,494 | 1.1% | 25 Feb, 2026 |
| 16 | Smith W Davis | Director | 5,255 | 0 | 5,255 | 1.1% | 01 Mar, 2023 |
| 17 | Oliver W Brooks | Svp Enterprise Excellence | 5,178 | 0 | 5,178 | 1.1% | 25 Feb, 2025 |
| 18 | David C Wajsgras | Director | 5,106 | 0 | 5,106 | 1.0% | 02 Sep, 2026 |
| 19 | Donald W Slager | Director | 5,064 | 0 | 5,064 | 1.0% | 18 May, 2026 |
| 20 | Thomas Pike | Director | 5,029 | 0 | 5,029 | 1.0% | 02 Sep, 2026 |
| 21 | Kelly Gean Bennett | Svp, Chro | 4,454 | 0 | 4,454 | 0.9% | 27 Feb, 2024 |
| 22 | Dorothy M Ables | Director | 4,221 | 0 | 4,221 | 0.9% | 18 May, 2026 |
| 23 | Bradley D Kohn | Svp, General Counsel And Secy | 3,625 | 0 | 3,625 | 0.7% | 25 Feb, 2025 |
| 24 | Anthony R Foxx | Director | 2,615 | 0 | 2,615 | 0.5% | 18 May, 2026 |
| 25 | Mary T Mack | Director | 914 | 0 | 914 | 0.2% | 18 May, 2026 |
| 26 | Martin J Lyons | Director | 442 | 0 | 442 | 0.1% | 02 Sep, 2026 |
| 27 | Philipp Niemann | Director | 337 | 0 | 337 | 0.1% | 25 Aug, 2026 |
| 28 | Gayla J Delly | Director | 313 | 0 | 313 | 0.1% | 18 May, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 21 Aug, 2026 | Philipp Niemann | Director | Acquired A | 337 | $0.00 | $0 | 337 | Direct |
| 03 Aug, 2026 | Michael J Petro | Svp And Cfo | Disposed F | 368 | $542.27 | $199.56K | 14,991 | Direct |
| 29 May, 2026 | Thomas Pike | Director | Acquired A | 59 | $581.64 | $34.32K | 4,963 | Direct |
| 29 May, 2026 | David C Wajsgras | Director | Acquired A | 69 | $581.64 | $40.13K | 5,028 | Direct |
| 29 May, 2026 | Martin J Lyons | Director | Acquired A | 61 | $581.64 | $35.48K | 374 | Direct |
| 14 May, 2026 | Gayla J Delly | Director | Acquired A | 313 | $0.00 | $0 | 313 | Direct |
| 14 May, 2026 | Donald W Slager | Director | Acquired A | 313 | $0.00 | $0 | 5,064 | Direct |
| 14 May, 2026 | Mary T Mack | Director | Acquired A | 313 | $0.00 | $0 | 914 | Direct |
| 14 May, 2026 | Martin J Lyons | Director | Acquired A | 313 | $0.00 | $0 | 313 | Direct |
| 14 May, 2026 | Laree E Perez | Director | Acquired A | 313 | $0.00 | $0 | 15,730 | Direct |
| 14 May, 2026 | David C Wajsgras | Director | Acquired A | 313 | $0.00 | $0 | 4,959 | Direct |
| 14 May, 2026 | Dorothy M Ables | Director | Acquired A | 313 | $0.00 | $0 | 4,221 | Direct |
| 14 May, 2026 | Thomas Pike | Director | Acquired A | 313 | $0.00 | $0 | 4,904 | Direct |
| 14 May, 2026 | Anthony R Foxx | Director | Acquired A | 313 | $0.00 | $0 | 2,615 | Direct |
| 01 May, 2026 | Christopher William Samborski | Evp, Coo | Acquired A | 8,101 | $0.00 | $0 | 21,762 | Direct |
| 01 Mar, 2026 | Michael J Petro | Svp And Cfo | Acquired A | 2,960 | $0.00 | $0 | 15,359 | Direct |
| 01 Mar, 2026 | George Frederick Schoen | Evp, Gc And Corp. Secretary | Acquired A | 23,673 | $0.00 | $0 | 23,673 | Direct |
| 01 Mar, 2026 | Donald A. Mccunniff | Evp And Chro | Acquired A | 2,960 | $0.00 | $0 | 7,518 | Direct |
| 01 Mar, 2026 | Michael J Petro | Svp And Cfo | Acquired A | 2,960 | $0.00 | $0 | 15,359 | Direct |
| 01 Mar, 2026 | Michael J Petro | Svp And Cfo | Acquired A | 2,960 | $0.00 | $0 | 15,359 | Direct |