Martin Marietta Materials, Inc. (MLM) ownership: Top institutional holder: VANGUARD GROUP INC ($4.59B). Insider activity: Net Seller (3 buys, 17 sells). 10 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| VANGUARD GROUP INC | 7373884.00 | $4.59B | 2025-12-31 |
| BlackRock, Inc. | 4685757.00 | $2.76B | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3917383.00 | $2.31B | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 3160444.00 | $1.86B | 2026-03-31 |
| STATE STREET CORP | 2877568.00 | $1.69B | 2026-03-31 |
| FMR LLC | 2607979.00 | $1.54B | 2026-03-31 |
| BANK OF AMERICA CORP /DE/ | 2399779.00 | $1.41B | 2026-03-31 |
| PRINCIPAL FINANCIAL GROUP INC | 2093942.00 | $1.23B | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-05-14 | |
| Sell | null | 2026-05-14 | |
| Sell | null | 2026-05-14 | |
| Sell | null | 2026-05-14 | |
| Sell | null | 2026-05-14 | |
| Sell | null | 2026-05-14 | |
| Sell | null | 2026-05-14 | |
| Sell | null | 2026-05-14 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.