Martin Marietta Materials (MLM) insider buying and selling
Every Table I transaction reported by directors and officers of S&P 500 companies on SEC Form 4 filings (2 business days to file): each row labeled with its official transaction code, nothing filtered out beforehand.
Open-market purchases (code P) are the rare signal, in green; sales (code S) are common and often pre-scheduled (10b5-1). Table II (derivatives) is not included: its prices are exercise prices, not market values. Guide: insider buying.
| Date | Ticker | Insider | Role | Shares | Price | Amount | % of stake | Type / filing |
|---|
Download these transactions as CSV No account, no sign-up. The data is public: it comes from SEC Form 4 filings.
Martin Marietta Materials, Inc. (MLM) insider buying and selling: none on the open market
61 Form 4 Table I transactions filed with the SEC by Martin Marietta Materials, Inc. insiders between 2025-09-02 and 2026-09-02 (15-month history): 0 open-market purchases and 0 sales, plus 61 transactions under other Form 4 codes, broken down one by one below. There are no open-market purchases or sales in this period: every transaction carries another code, broken down below.
Martin Marietta Materials insider buying and selling over the last 12 months
Between Oct 21, 2025 and Oct 20, 2026, no Martin Marietta Materials insider filed an open-market purchase or sale (Form 4 codes P and S). They did file 58 transactions under other codes, broken down below.
Against its sector (Basic Materials, 19 companies with an insider page on this site), over the same dates the median is 5 sales and 0 purchases on the open market. Martin Marietta Materials has no sales, like 1 of the other 18, and 7 of the 19 have at least one purchase.
The 20 most important trades
With no open-market buys or sells, these are its transactions under other codes, largest first. The full history is in the tool above, already searched.
See all 61 MLM trades in the full history →
| Trade date | Filed | Insider | Role | Amount | Code | Filing |
|---|---|---|---|---|---|---|
| 2026-02-17 | 2026-02-19 | Nye C Howard | Chairman, Pres & CEO | $6.5M | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-02-23 | 2026-02-25 | Nye C Howard | Chairman, Pres & CEO | $1.2M | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-02-20 | 2026-02-24 | Nye C Howard | Chairman, Pres & CEO | $1.2M | A — Grant or awardForm 4 footnoteF1 Restricted stock unit award granted under the Martin Marietta Materials, Inc. Amended and Restated Stock-Based Award Plan, which award vests pro rata in equal installments over three years from the date of grant. | SEC |
| 2026-02-24 | 2026-02-25 | Nye C Howard | Chairman, Pres & CEO | $851k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-02-17 | 2026-02-19 | Cardin Robert J | SVP, Controller & CAO | $548k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-02-17 | 2026-02-19 | Petro Michael J | SVP and CFO | $505k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-02-20 | 2026-02-24 | Flynn Jason Paul | SVP and CIO | $325k | A — Grant or awardForm 4 footnoteF1 Restricted stock unit award granted under the Martin Marietta Materials, Inc. Amended and Restated Stock-Based Award Plan, which award vests pro rata in equal installments over three years from the date of grant. | SEC |
| 2025-12-01 | 2025-12-03 | Bar Roselyn R | Executive Vice President | $258k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-08-03 | 2026-08-04 | Petro Michael J | SVP and CFO | $200k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2025-12-16 | 2025-12-17 | Nye C Howard | Chairman, Pres & CEO | $188k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-02-23 | 2026-02-25 | Petro Michael J | SVP and CFO | $144k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-02-23 | 2026-02-25 | Cardin Robert J | SVP, Controller & CAO | $143k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-02-23 | 2026-02-25 | Mccunniff Donald A. | EVP and CHRO | $131k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-02-23 | 2026-02-25 | Flynn Jason Paul | SVP and CIO | $121k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2025-12-01 | 2025-12-03 | Flynn Jason Paul | SVP and CIO | $76k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-02-24 | 2026-02-25 | Cardin Robert J | SVP, Controller & CAO | $72k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-02-17 | 2026-02-19 | Flynn Jason Paul | SVP and CIO | $71k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-02-24 | 2026-02-25 | Petro Michael J | SVP and CFO | $66k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2025-08-29 | 2025-09-02 | Koraleski John J | Director | $47k | A — Grant or awardForm 4 footnoteF1 Common stock units were accrued under the Martin Marietta Materials, Inc. Common Stock Purchase Plan for Directors (the "Plan") and are to be settled in stock in a lump sum or in installments not to exceed 10 years commencing on (i) the date the reporting person ceases to be a Non-Employee Director, (ii) the date that is one month and one year following the date the reporting person ceases to be a Non-Employee Director, or (iii) the date elected by the Non-Employee Director that is later than the third anniversary of the date the fees are earned, in accordance with the reporting person's election under the Plan. | SEC |
| 2025-11-28 | 2025-12-01 | Koraleski John J | Director | $47k | A — Grant or awardForm 4 footnoteF1 Common stock units were accrued under the Martin Marietta Materials, Inc. Common Stock Purchase Plan for Directors (the "Plan") and are to be settled in stock in a lump sum or in installments not to exceed 10 years commencing on (i) the date the reporting person ceases to be a Non-Employee Director, (ii) the date that is one month and one year following the date the reporting person ceases to be a Non-Employee Director, or (iii) the date elected by the Non-Employee Director that is later than the third anniversary of the date the fees are earned, in accordance with the reporting person's election under the Plan. | SEC |
The period balance: money in, money out
Between Sep 2, 2025 and Sep 2, 2026 there is no open-market activity in Martin Marietta Materials, Inc.: the 61 filed transactions all carry other codes, and they are the ones in the table below.
Only codes P and S count, where an insider puts in or takes out their own money. It is not a recommendation to buy or sell: it is what was filed.
Every transaction, code by code
| Code | What it means | Trades | Reported amount |
|---|---|---|---|
| A | Grant or award | 40 | $2.1M |
| F | Tax withholding (shares surrendered for taxes) | 20 | $11.2M |
| G | Gift | 1 | $0 |
| Total | Everything filed in the period | 61 | $13.3M |
24 of the 61 rows carry no usable amount on the Form 4: they count as trades and add $0. The code labels come from the SEC index.
Who has traded
Over the 15 months of history, 19 distinct people or entities have filed Martin Marietta Materials, Inc. transactions: none bought on the open market and none sold. Counted by CIK, the fixed number the SEC gives each filer, and not by name, which each filer types their own way.
| Filer | Role | Transactions | Bought (count) | Sold (count) | Last filed |
|---|---|---|---|---|---|
| Petro Michael J | SVP and CFO | 8 | — | — | 2026-09-02 |
| Nye C Howard | Chairman, Pres & CEO | 7 | — | — | 2026-03-03 |
| Cardin Robert J | SVP, Controller & CAO | 6 | — | — | 2026-02-25 |
| Flynn Jason Paul | SVP and CIO | 6 | — | — | 2026-02-25 |
| Pike Thomas | Director | 6 | — | — | 2026-09-02 |
| Wajsgras David C | Director | 6 | — | — | 2026-09-02 |
| Mccunniff Donald A. | EVP and CHRO | 4 | — | — | 2026-03-03 |
| Bar Roselyn R | Executive Vice President | 3 | — | — | 2025-12-17 |
Shown here are the 8 who moved the most money, out of 19. The rest are in the full history, one link above. The name links to all their trades, in any company. "Transactions" counts any code; the money, open market only. Role: from their latest filing.
Month by month
Across the 15 months of history there is no open-market trade at all in Martin Marietta Materials, Inc., so no calendar is published: 15 rows of zeros would fake a pattern where there is no sample to read. Everything filed is listed, with its date, in the tables above.
Martin Marietta Materials, Inc. (MLM) analysis page →
Other Basic Materials companies with insider trades
All 500 are listed in the section index →
Which insiders are buying their own company stock →
How to read this data
Martin Marietta Materials has no open-market purchase (code P) in the history, the most common case in the S&P 500: insiders are already paid in stock. The latest filing is from Sep 2, 2026, and a Form 4 arrives up to two business days after the trade.
4 of the 20 rows in the table carry footnotes from the Form 4 itself, folded into the code column and copied verbatim; a row with no footnote means the filing has none.
Guide: Insider buying · all guides
What is behind these trades
The concepts on this page, explained from scratch in the Academy. Free, no account.
- What the efficiency hypothesis says and what it does NOT sayIf an insider's purchase is public and anyone can read it, is there any information left in it? That is the exact question that brings people here.
- Who really moves the market: the types of investorWho sits on the other side of each order, and where a company's own insiders fit among them.
- Supply, demand and price: why it rises and falls constantlyHow a piece of news ends up inside the price, and why the reaction to a filed sale is rarely the one you would expect.
Source: SEC EDGAR Form 4. This is a list of public facts, not financial advice or a recommendation to buy or sell.