MARTIN MARIETTA MATERIALS (MLM) Stock Institutional Trading Activity
MARTIN MARIETTA MATERIALS (MLM) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Eagle Capital Management, Gardner Russo & Quinn, Sequoia Financial Advisors, Lountzis Asset Management, and Egerton Capital UK. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.
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- MARTIN MARIETTA MATERIALS (MLM) stock institutional ownership
- MARTIN MARIETTA MATERIALS (MLM) stock insider trading activity
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| Portfolio quarter | Name | Type | Quantity | Remaining | Reported stock balance |
|---|---|---|---|---|---|
| Q3 2018 | Gardner Russo & Quinn | Sell | -3,908 | 1,987,280 | $361,586 |
| Q3 2018 | First Eagle U.S. Value | Sell | -51,939 | 440,878 | $80,218 |
| Q2 2018 | Gardner Russo & Quinn | Sell | -24,410 | 1,991,188 | $444,692 |
| Q2 2018 | First Eagle U.S. Value | Sell | -26,918 | 492,817 | $110,061 |
| Q1 2018 | Gardner Russo & Quinn | Buy | 3,841 | 2,015,598 | $417,833 |
| Q4 2017 | Gardner Russo & Quinn | Sell | -22,394 | 2,011,757 | $444,679 |
| Q4 2017 | Egerton Capital UK | Sell | -834,361 | 916,019 | $202,477 |
| Q3 2017 | Gardner Russo & Quinn | Buy | 268,198 | 2,034,151 | $419,503 |
| Q3 2017 | Egerton Capital UK | Sell | -217,485 | 1,750,380 | $360,981 |
| Q2 2017 | Gardner Russo & Quinn | Sell | -13,719 | 1,765,953 | $393,066 |
| Q2 2017 | Renaissance Technologies LLC | Buy | 120,900 | 122,794 | $27,331 |
| Q2 2017 | Egerton Capital UK | Buy | 1,509,258 | 1,967,865 | $438,007 |
| Q1 2017 | Gardner Russo & Quinn | Sell | -34,667 | 1,779,672 | $388,413 |
| Q1 2017 | Renaissance Technologies LLC | Sell | -208,400 | 1,894 | $413 |
| Q1 2017 | Egerton Capital UK | Sell | -300,946 | 458,607 | $100,091 |
| Q1 2017 | First Eagle U.S. Value | Sell | -65,100 | 519,735 | $113,432 |
| Q4 2016 | Gardner Russo & Quinn | Sell | -254,997 | 1,814,339 | $401,931 |
| Q4 2016 | Renaissance Technologies LLC | Buy | 163,800 | 210,294 | $46,586 |
| Q4 2016 | First Eagle U.S. Value | Sell | -862,105 | 584,835 | $129,558 |
| Q4 2016 | Egerton Capital UK | Sell | -245,817 | 759,553 | $168,264 |
| Q3 2016 | Gardner Russo & Quinn | Sell | -16,222 | 2,069,336 | $370,639 |
| Q3 2016 | Egerton Capital UK | Sell | -467,582 | 1,005,370 | $180,072 |
| Q3 2016 | First Eagle U.S. Value | Buy | 53,431 | 1,446,940 | $259,162 |
| Q2 2016 | Gardner Russo & Quinn | Sell | -18,085 | 2,085,558 | $400,427 |
| Q2 2016 | First Eagle U.S. Value | Sell | -370,160 | 1,393,509 | $267,553 |
| Q2 2016 | Egerton Capital UK | Buy | 512,574 | 1,472,952 | $282,807 |
| Q1 2016 | Gardner Russo & Quinn | Buy | 1,170 | 2,103,643 | $335,552 |
| Q1 2016 | Egerton Capital UK | Sell | -440,587 | 960,378 | $153,190 |
| Q1 2016 | First Eagle U.S. Value | Buy | 15,234 | 1,763,669 | $281,323 |
| Q4 2015 | Gardner Russo & Quinn | Buy | 31,946 | 2,102,473 | $287,156 |
Frequently asked questions about MLM activity
Which institutional owners are buying MLM?
Institutional owners buying MLM include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in MLM activity?
"Buy" means an investor increased their reported position in MLM compared to the prior reporting period. This reflects growing exposure to MARTIN MARIETTA MATERIALS (MLM) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in MLM increasing?
Institutional interest in MLM can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.