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Martin Marietta Materials Inc (New York Stock Exchange:MLM)
US · Delayed Price · Currency is USD
507.07-0.10 (-0.02%)
Insider Score
––Not scored
MLM Insider Score
Insiders here have filed 6 Form 4s in the last 90 days, but all of them are share awards, grants or other non-market transactions. Those are compensation, not a decision to buy, so they are not scored.
MLM Stock Insider Trading Activity
MLM stock’s insider trading shows no open-market insider trades by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| Petro Michael J CFO | Award | 9,331 | — | — | 62.2% | 24,322 | Sep 1, 2026 | — | Form 4 |
| LYONS MARTIN J Director | Award | 68 | $518.70 | $35.27K | 18.2% | 442 | Aug 31, 2026 | — | Form 4 |
| Pike Thomas Director | Award | 66 | $518.70 | $34.23K | 1.3% | 5,029 | Aug 31, 2026 | — | Form 4 |
| WAJSGRAS DAVID C Director | Award | 78 | $518.70 | $40.46K | 1.6% | 5,106 | Aug 31, 2026 | — | Form 4 |
| Niemann Philipp Director | Award | 337 | — | — | New | 337 | Aug 21, 2026 | — | Form 4 |
| Petro Michael J CFO | Tax withheld | 368 | $542.27 | $199.56K | 2.4% | 14,991 | Aug 3, 2026 | — | Form 4 |
| WAJSGRAS DAVID C Director | Award | 69 | $581.64 | $40.13K | 1.4% | 5,028 | May 29, 2026 | — | Form 4 |
| LYONS MARTIN J Director | Award | 61 | $581.64 | $35.48K | 19.5% | 374 | May 29, 2026 | — | Form 4 |
| Pike Thomas Director | Award | 59 | $581.64 | $34.32K | 1.2% | 4,963 | May 29, 2026 | — | Form 4 |
| Mack Mary T Director | Award | 313 | — | — | 52.1% | 914 | May 14, 2026 | — | Form 4 |
| LYONS MARTIN J Director | Award | 313 | — | — | New | 313 | May 14, 2026 | — | Form 4 |
| Foxx Anthony R Director | Award | 313 | — | — | 13.6% | 2,615 | May 14, 2026 | — | Form 4 |
| SLAGER DONALD W Director | Award | 313 | — | — | 6.6% | 5,064 | May 14, 2026 | — | Form 4 |
| Ables Dorothy M Director | Award | 313 | — | — | 8.0% | 4,221 | May 14, 2026 | — | Form 4 |
| WAJSGRAS DAVID C Director | Award | 313 | — | — | 6.7% | 4,959 | May 14, 2026 | — | Form 4 |
| DELLY GAYLA J Director | Award | 313 | — | — | New | 313 | May 14, 2026 | — | Form 4 |
| Pike Thomas Director | Award | 313 | — | — | 6.8% | 4,904 | May 14, 2026 | — | Form 4 |
| PEREZ LAREE E Director | Award | 313 | — | — | 2.0% | 15,730 | May 14, 2026 | — | Form 4 |
| Samborski Christopher William COO | Award | 8,101 | — | — | 59.3% | 21,762 | May 1, 2026 | — | Form 4 |
| Nye C Howard CEO | Award | 5,919 | — | — | 3.5% | 176,038 | Mar 1, 2026 | — | Form 4 |
| Schoen George Frederick Other | Award | 23,673 | — | — | New | 23,673 | Mar 1, 2026 | — | Form 4 |
| Petro Michael J CFO | Award | 2,960 | — | — | 23.9% | 15,359 | Mar 1, 2026 | — | Form 4 |
| McCunniff Donald A. Other | Award | 2,960 | — | — | 64.9% | 7,518 | Mar 1, 2026 | — | Form 4 |
| KORALESKI JOHN J Director | Award | 69 | $676.57 | $46.68K | 0.8% | 8,822 | Feb 27, 2026 | — | Form 4 |
| WAJSGRAS DAVID C Director | Award | 56 | $676.57 | $37.89K | 1.2% | 4,646 | Feb 27, 2026 | — | Form 4 |
| Pike Thomas Director | Award | 47 | $676.57 | $31.80K | 1.0% | 4,591 | Feb 27, 2026 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Award (A) — Grant or award from the company, not a purchase
- Tax withheld (F) — Shares withheld to pay tax or an exercise price
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.