Martin Marietta Materials, Inc. (MLM) Insider Trading
Over the last 6 months, 729 institutions increased and 779 reduced their position (13F).
Insider Activity
Sentiment
50/100
Buys (3m)
0
Sells (3m)
0
Net (3m)
$0
Insider trades by month Buys Sells
Aug
Feb
Mar
Mar
Aug
Context3-month price -10.8%Institutions mixed (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Sep 2, 2026 | WAJSGRAS DAVID Cdirector | Grant | 78 | $518.70 |
| Sep 2, 2026 | LYONS MARTIN Jdirector | Grant | 68 | $518.70 |
| Sep 2, 2026 | Petro Michael Jofficer: SVP and CFO | Grant | 9,331 | — |
| Sep 2, 2026 | Pike Thomasdirector | Grant | 66 | $518.70 |
| Aug 25, 2026 | Niemann Philippdirector | Grant | 337 | — |
| Aug 4, 2026 | Petro Michael Jofficer: SVP and CFO | Tax | 368 | $542.27 |
| Jun 2, 2026 | LYONS MARTIN Jdirector | Grant | 61 | $581.64 |
| Jun 2, 2026 | WAJSGRAS DAVID Cdirector | Grant | 69 | $581.64 |
| Jun 2, 2026 | Pike Thomasdirector | Grant | 59 | $581.64 |
| May 18, 2026 | LYONS MARTIN Jdirector | Grant | 313 | — |
| May 18, 2026 | Foxx Anthony Rdirector | Grant | 313 | — |
| May 18, 2026 | SLAGER DONALD Wdirector | Grant | 313 | — |
| May 18, 2026 | Ables Dorothy Mdirector | Grant | 313 | — |
| May 18, 2026 | Mack Mary Tdirector | Grant | 313 | — |
| May 18, 2026 | DELLY GAYLA Jdirector | Grant | 313 | — |
| May 18, 2026 | WAJSGRAS DAVID Cdirector | Grant | 313 | — |
| May 18, 2026 | Pike Thomasdirector | Grant | 313 | — |
| May 18, 2026 | PEREZ LAREE Edirector | Grant | 313 | — |
| May 5, 2026 | Samborski Christopher Williamofficer: EVP, COO | Grant | 8,101 | — |
| Mar 2, 2026 | KORALESKI JOHN Jdirector | Grant | 69 | $676.57 |
| Mar 2, 2026 | Pike Thomasdirector | Grant | 47 | $676.57 |
| Mar 2, 2026 | WAJSGRAS DAVID Cdirector | Grant | 56 | $676.57 |
| Feb 25, 2026 | Cardin Robert Jofficer: SVP, Controller & CAO | Tax | 209 | $683.60 |
| Feb 25, 2026 | Flynn Jason Paulofficer: SVP and CIO | Tax | 30 | $696.85 |
| Feb 25, 2026 | Petro Michael Jofficer: SVP and CFO | Tax | 94 | $696.85 |
| Feb 25, 2026 | Flynn Jason Paulofficer: SVP and CIO | Tax | 177 | $683.60 |
| Feb 25, 2026 | Petro Michael Jofficer: SVP and CFO | Tax | 211 | $683.60 |
| Feb 25, 2026 | Nye C Howarddirector, officer: Chairman, Pres & CEO | Tax | 1,805 | $683.60 |
| Feb 25, 2026 | Nye C Howarddirector, officer: Chairman, Pres & CEO | Tax | 1,221 | $696.85 |
| Feb 25, 2026 | McCunniff Donald A.officer: EVP and CHRO | Tax | 192 | $683.60 |
Source: MLM SEC Form 4 filings, latest Sep 2, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their MLM positions over the last 6 months (SEC Form 13F).
Increased
729
New positions
217
Reduced
779
Sold out
108
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| BlackRock, Inc. | Increased | 4.7M | Aug 7, 2026 |
| BLACKROCK, INC. | Increased | 4.7M | May 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 3.9M | Aug 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 3.9M | May 15, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 3.2M | Aug 13, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 3.2M | May 8, 2026 |
| STATE STREET CORP | Increased | 3.2M | Aug 7, 2026 |
| STATE STREET CORP | Increased | 2.9M | May 15, 2026 |
| FMR LLC | Reduced | 2.6M | May 15, 2026 |
| BANK OF AMERICA CORP /DE/ | Increased | 2.4M | Aug 14, 2026 |
| BANK OF AMERICA CORP /DE/ | Increased | 2.4M | May 18, 2026 |
| FMR LLC | Reduced | 2.2M | Aug 13, 2026 |
| PRINCIPAL FINANCIAL GROUP INC | Increased | 2.1M | Aug 4, 2026 |
| PRINCIPAL FINANCIAL GROUP INC | Reduced | 2.1M | May 4, 2026 |
| ARISTOTLE CAPITAL MANAGEMENT, LLC | Reduced | 2.0M | May 15, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.