What the executives and directors of Martin Marietta Materials actually did with their own shares, decoded from three years of SEC Form 4 filings.
The tape: three years of insider trades
Every marker sits at the exact price reported on the Form 4. The line is the monthly median of all prices insiders reported, so the chart needs no market feed; the gray strip is routine flow (vestings, tax withholding, gifts) that headlines love to miscount as selling.
Where the shares went, last 12 months
Every Form 4 movement decomposed: what flowed in (grants, vested equity, purchases) and what flowed out (tax withholding, plan sales, discretionary sales, gifts). Counted in shares, because grants carry no price.
Skin in the game
Directly held shares as reported after each trade, indexed to 100 five years back. Direct holdings only: trust and family-entity positions are per-entity in the filings and do not sum honestly, so this chart refuses to guess. The steps are the trades.
Who holds what
| Insider | Role | Shares held | Buys 12 m | Sales 12 m |
|---|---|---|---|---|
| Nye C Howard Chairman, Pres & CEO | CEO | 246.4K | — | — |
| BAR ROSELYN R SVP, General Counsel and Secy | Officer | 62.6K | — | — |
| Nickolas James AJ EVP and CFO | CFO | 26.6K | — | — |
| Schoen George Frederick EVP, GC and Corp. Secretary | Officer | 23.7K | — | — |
| Samborski Christopher William EVP, COO | COO | 21.8K | — | — |
| Quillen Michael J | Director | 21.3K | — | — |
| COLE SUE W | Director | 20.4K | — | — |
| PEREZ LAREE E | Director | 15.7K | — | $637K |
| Petro Michael J SVP and CFO | CFO | 15K | — | — |
| Mohr John P SVP - CIO | Officer | 15K | — | — |
| Cardin Robert J SVP, Controller & CAO | Officer | 12.5K | — | — |
| KORALESKI JOHN J | Director | 10.8K | — | — |
| LaTorre Craig M Sr. VP, CHRO | Officer | 8,634 | — | — |
| McCunniff Donald A. EVP and CHRO | Officer | 7,518 | — | — |
Open-market trade log
| Date | Insider | Type | Shares | Price | Value |
|---|---|---|---|---|---|
| 2025-08-08 | PEREZ LAREE E (Director) | Discretionary sale | 1,038 | $613.32 | $637K |
| 2025-03-05 | McCunniff Donald A. (Officer) | Discretionary sale | 1,332 | $475.00 | $633K |
| 2025-03-04 | Petro Michael J (Officer) | Open-market buy | 550 | $454.37 | $250K |
| 2024-03-14 | BAR ROSELYN R (Officer) | Discretionary sale | 10K | $603.29 | $6M |
| 2024-03-05 | Nye C Howard (CEO) | Discretionary sale | 5,000 | $604.26 | $3M |
| 2024-03-05 | Nye C Howard (CEO) | Discretionary sale | 15K | $604.26 | $9.1M |
| 2024-02-16 | COLE SUE W (Director) | Discretionary sale | 843 | $541.22 | $456K |
| 2024-02-16 | COLE SUE W (Director) | Discretionary sale | 881 | $545.64 | $481K |
| 2023-08-21 | LaTorre Craig M (Officer) | Discretionary sale | 1,934 | $431.68 | $835K |
| 2023-07-28 | LaTorre Craig M (Officer) | Discretionary sale | 500 | $447.09 | $224K |
| 2022-11-18 | COLE SUE W (Director) | Discretionary sale | 1,685 | $355.61 | $599K |
| 2022-06-10 | Mohr John P (Officer) | Discretionary sale | 0 | $321.75 | $145 |
| 2021-03-10 | Nye C Howard (CEO) | Discretionary sale | 6,948 | $337.79 | $2.3M |
| 2021-03-10 | Nye C Howard (CEO) | Discretionary sale | 10K | $337.84 | $3.4M |
| 2021-03-09 | Nye C Howard (CEO) | Discretionary sale | 3,052 | $335.06 | $1M |
| 2020-11-24 | BAR ROSELYN R (Officer) | Discretionary sale | 10K | $274.64 | $2.7M |
| 2020-09-10 | COLE SUE W (Director) | Discretionary sale | 468 | $207.03 | $97K |
| 2020-09-08 | COLE SUE W (Director) | Discretionary sale | 750 | $209.18 | $157K |
| 2020-06-10 | ZELNAK STEPHEN P JR (Director) | Discretionary sale | 1,350 | $207.74 | $280K |
| 2020-06-05 | ZELNAK STEPHEN P JR (Director) | Discretionary sale | 3,500 | $226.80 | $794K |
| 2020-06-05 | ZELNAK STEPHEN P JR (Director) | Discretionary sale | 13.4K | $225.23 | $3M |
| 2020-05-21 | Nye C Howard (CEO) | Discretionary sale | 6,645 | $177.62 | $1.2M |
| 2020-05-13 | KORALESKI JOHN J (Director) | Open-market buy | 1,000 | $164.08 | $164K |
| 2020-05-06 | KORALESKI JOHN J (Director) | Open-market buy | 1,000 | $183.54 | $184K |
| 2020-03-31 | ZELNAK STEPHEN P JR (Director) | Open-market buy | 8 | $177.24 | $1K |
| 2019-12-31 | ZELNAK STEPHEN P JR (Director) | Open-market buy | 5 | $277.43 | $1K |
| 2019-12-31 | Grant Daniel L. (Officer) | Open-market buy | 22 | $277.35 | $6K |
| 2019-12-13 | Nye C Howard (CEO) | Discretionary sale | 4,202 | $276.87 | $1.2M |
| 2019-11-25 | KORALESKI JOHN J (Director) | Open-market buy | 1,000 | $260.23 | $260K |
| 2019-09-30 | ZELNAK STEPHEN P JR (Director) | Open-market buy | 5 | $271.29 | $1K |
| 2019-09-30 | Grant Daniel L. (Officer) | Open-market buy | 14 | $271.35 | $4K |
| 2019-08-30 | Nye C Howard (CEO) | Discretionary sale | 7,440 | $253.52 | $1.9M |
| 2019-08-01 | BAR ROSELYN R (Officer) | Discretionary sale | 2,821 | $246.93 | $697K |
| 2019-08-01 | Nye C Howard (CEO) | Discretionary sale | 11.2K | $243.66 | $2.7M |
| 2019-06-28 | ZELNAK STEPHEN P JR (Director) | Open-market buy | 6 | $226.65 | $1K |
| 2019-06-28 | Grant Daniel L. (Officer) | Open-market buy | 10 | $226.67 | $2K |
| 2019-06-10 | PEREZ LAREE E (Director) | Discretionary sale | 824 | $231.80 | $191K |
| 2019-05-06 | McCunniff Donald A. (Officer) | Discretionary sale | 3,183 | $220.19 | $701K |
| 2019-05-06 | Nye C Howard (CEO) | Discretionary sale | 14.7K | $220.48 | $3.2M |
| 2019-03-29 | ZELNAK STEPHEN P JR (Director) | Open-market buy | 6 | $200.34 | $1K |
| 2019-03-29 | Grant Daniel L. (Officer) | Open-market buy | 10 | $200.33 | $2K |
| 2019-03-05 | COLE SUE W (Director) | Discretionary sale | 1,500 | $195.07 | $293K |
| 2019-02-28 | McCunniff Donald A. (Officer) | Discretionary sale | 1,563 | $189.31 | $296K |
| 2019-02-27 | McCunniff Donald A. (Officer) | Discretionary sale | 660 | $190.90 | $126K |
| 2018-12-31 | ZELNAK STEPHEN P JR (Director) | Open-market buy | 7 | $168.81 | $1K |
| 2018-12-31 | Grant Daniel L. (Officer) | Open-market buy | 12 | $168.90 | $2K |
| 2018-12-14 | KORALESKI JOHN J (Director) | Open-market buy | 1,000 | $174.07 | $174K |
| 2018-11-09 | McCunniff Donald A. (Officer) | Discretionary sale | 1,476 | $185.50 | $274K |
| 2018-10-01 | Mohr John P (Officer) | Open-market buy | 1 | $185.60 | $232 |
| 2018-09-28 | ZELNAK STEPHEN P JR (Director) | Open-market buy | 7 | $185.91 | $1K |
| 2018-09-28 | Grant Daniel L. (Officer) | Open-market buy | 10 | $185.79 | $2K |
| 2018-08-22 | McCunniff Donald A. (Officer) | Discretionary sale | 2,250 | $204.33 | $460K |
| 2018-07-30 | ZELNAK STEPHEN P JR (Director) | Open-market buy | 3,500 | $202.87 | $710K |
| 2018-07-27 | KORALESKI JOHN J (Director) | Open-market buy | 2,400 | $208.06 | $499K |
| 2018-07-02 | Mohr John P (Officer) | Open-market buy | 1 | $221.16 | $212 |
| 2018-06-29 | ZELNAK STEPHEN P JR (Director) | Open-market buy | 5 | $222.48 | $1K |
| 2018-06-29 | Grant Daniel L. (Officer) | Open-market buy | 5 | $222.50 | $1K |
| 2018-06-13 | McCunniff Donald A. (Officer) | Discretionary sale | 4,226 | $230.72 | $975K |
| 2018-05-11 | BAR ROSELYN R (Officer) | Discretionary sale | 727 | $215.98 | $157K |
| 2018-05-11 | BAR ROSELYN R (Officer) | Discretionary sale | 5,271 | $213.36 | $1.1M |
“Since trade” compares with the latest insider-implied price, not a market quote; this site carries no market data by design.
Filing hygiene
How to read this
A Form 4 transaction code decides everything. P is an open-market purchase and S an open-market sale; those two are the only codes where an insider chose to trade. A is a grant, M an option exercise or vesting, F shares withheld to cover tax, G a gift. Most “insiders dumped billions” headlines are code F and M mechanics.
Sales flagged 10b5-1 run on a plan the insider adopted in advance; since 2023 every Form 4 carries that flag. Buys have historically predicted returns, sales mostly have not, and this page states filings, not advice.