Martin Marietta Materials Inc
Ownership
Ownership Structure
Who owns Martin Marietta Materials Inc (MLM)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 71.0% of the shares are freely tradable; institutional investors hold 101.4%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 6.60 | 4,685,757 | +4.4 | 03/31/2026 |
| Vanguard Capital Management, LLC | 5.52 | 3,917,383 | +0.0 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 4.45 | 3,160,444 | +0.0 | 03/31/2026 |
| State Street Corp | 4.05 | 2,877,568 | +3.8 | 03/31/2026 |
| FMR Inc | 3.67 | 2,607,979 | -10.7 | 03/31/2026 |
| Bank of America Corp | 3.38 | 2,399,779 | +0.9 | 03/31/2026 |
| Principal Financial Group Inc | 2.98 | 2,116,369 | +1.1 | 06/30/2026 |
| Aristotle Capital Management LLC | 2.75 | 1,955,100 | -4.6 | 03/31/2026 |
| JPMorgan Chase & Co | 2.62 | 1,860,226 | -16.6 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 2.70 | 1,918,472 | +0.3 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Petro Michael J | SVP and CFO | 24,322 | 12,024,600 $ | Sep 1, 2026 | direct |
| Wajsgras David C | Director | 5,106 | 2,524,406 $ | Aug 31, 2026 | direct |
| Pike Thomas | Director | 5,029 | 2,486,338 $ | Aug 31, 2026 | direct |
| Lyons Martin J | Director | 442 | 218,525 $ | Aug 31, 2026 | direct |
| Niemann Philipp | Director | 337 | 166,613 $ | Aug 21, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 1, 2026 | Petro Michael J | SVP and CFO | Other | 9,331 | 0.00 | – |
| Aug 31, 2026 | Wajsgras David C | Director | Other | 78 | 518.70 | 40,459 |
| Aug 31, 2026 | Pike Thomas | Director | Other | 66 | 518.70 | 34,234 |
| Aug 31, 2026 | Lyons Martin J | Director | Other | 68 | 518.70 | 35,272 |
| Aug 21, 2026 | Niemann Philipp | Director | Other | 337 | 0.00 | – |
| Aug 3, 2026 | Petro Michael J | SVP and CFO | Other | 368 | 542.27 | 199,555 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.