Martin Marietta Materials, Inc. (MLM) Shareholders & Insider Trades
Martin Marietta Materials shareholders at a glance
The largest holder of Martin Marietta Materials stock is Kalk En Dolomiet Maatschappij S.A., with 11.0 million shares (15.42% of the company), worth about $5.68 billion as of September 25, 2026. The 10 largest holders together own 49.6%.
In Q2 2026, 1,109 institutional holdings reports listed shares worth $34.30 billion.
Insiders reported 72 transactions in the last two years: 2 sales worth $1.27 million and 1 purchase. The newest one on file is from May 14, 2026 (Lyons Martin J Jr, Director).
Major holders as of September 25, 2026; quarterly totals from institutional holdings reports (latest Q2 2026); insider transactions on file through May 14, 2026.
Martin Marietta Materials, Inc.
Shareholders Summary
2026Q2
Ownership by Type
Geographic Distribution
Largest Martin Marietta Materials shareholders
| Holder | Shares | % of company | Value |
|---|---|---|---|
| Kalk En Dolomiet Maatschappij S.A. | 11.0 million | 15.42% | $5.7B |
| Vanguard Capital Management LLC | 3.9 million | 5.53% | $2.0B |
| BlackRock Advisors LLC | 3.6 million | 5.12% | $1.9B |
| Vanguard Portfolio Management LLC | 3.2 million | 4.50% | $1.7B |
| State Street Corporation | 3.2 million | 4.45% | $1.6B |
| Merrill Lynch International | 2.4 million | 3.44% | $1.3B |
| Fidelity Management & Research Co. LLC | 2.2 million | 3.09% | $1.1B |
| Principal Global Investors LLC | 2.1 million | 2.98% | $1.1B |
| Aristotle Capital Management LLC | 1.8 million | 2.58% | $950.0M |
| Victory Capital Management, Inc. (Investment Management) | 1.8 million | 2.51% | $925.0M |
As of September 25, 2026.
Martin Marietta Materials institutional holdings by quarter
| Quarter | Reports | Shares | Value |
|---|---|---|---|
| Q2 2026 | 1,109 | – | $34.3B |
| Q1 2026 | 1,109 | 58.6 million | $34.4B |
| Q4 2025 | 1,152 | 60.5 million | $37.7B |
| Q3 2025 | 1,089 | 61.3 million | $38.6B |
| Q2 2025 | 1,035 | 59.9 million | $32.9B |
| Q1 2025 | 994 | 59.7 million | $28.5B |
| Q4 2024 | 1,029 | 59.1 million | $30.5B |
| Q3 2024 | 998 | 63.0 million | $33.9B |
Shares and value held by institutions that file quarterly holdings reports (options not included).
Martin Marietta Materials insider trades
| Insider | Date | Title | Transaction | Value |
|---|---|---|---|---|
| Lyons Martin J Jr | May 14, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Perez Laree E | May 14, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Slager Donald W | May 14, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Delly Gayla J | May 14, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Wajsgras David C | May 14, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Mack Mary T. | May 14, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Pike Thomas | May 14, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Ables Dorothy M | May 14, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Foxx Anthony R | May 14, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Samborski Christopher William | May 1, 2026 | Chief Operating Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Mccunniff Donald A | Feb 27, 2026 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Koraleski John J | Feb 27, 2026 | Director | Stock Award(Grant) at price 676.57 per share. | $46,683 |
Newest 12 of 72 insider transactions in the last two years.
Questions and answers
Who owns the most Martin Marietta Materials stock?
Kalk En Dolomiet Maatschappij S.A., with 15.42% of the company (as of September 25, 2026). Next: Vanguard Capital Management LLC (5.53%) and BlackRock Advisors LLC (5.12%).
How many institutions own Martin Marietta Materials stock?
1,109 institutional holdings reports listed Martin Marietta Materials shares in Q2 2026 worth $34.30 billion.
Are Martin Marietta Materials insiders buying or selling the stock?
In the last two years insiders reported 2 sales and 1 purchase (72 transactions in all); the newest on file is from May 14, 2026.
