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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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q3 2023Gardner Russo & QuinnSell-14,757958,763$393,553,088
Q3 2023Sequoia Financial AdvisorsBuy541,049$430,606
Q2 2023Gardner Russo & QuinnSell-27,818973,520$449,464,238
Q2 2023Sequoia Financial AdvisorsSell-41995$459,392
Q2 2023Lountzis Asset ManagementSell-4949,875$4,535
Q1 2023Gardner Russo & QuinnSell-9,0651,001,338$355,535,012
Q1 2023Renaissance Technologies LLCBuy2,6007,494$2,661
Q1 2023Sequoia Financial AdvisorsSell-2621,036$367,848
Q1 2023Lountzis Asset ManagementSell-610,369$3,682
Q4 2022Gardner Russo & QuinnSell-57,3801,010,403$341,485,916
Q4 2022Sequoia Financial AdvisorsBuy6271,298$438,688
Q4 2022Lountzis Asset ManagementSell-2,09910,375$3,702
Q3 2022Gardner Russo & QuinnSell-12,0441,067,783$343,922
Q3 2022Sequoia Financial AdvisorsSell-255671$216
Q3 2022Renaissance Technologies LLCSell-21,5004,894$1,576
Q3 2022Lountzis Asset ManagementSell-22512,474$4,017
Q2 2022Gardner Russo & QuinnSell-13,1441,079,827$323,127
Q2 2022Renaissance Technologies LLCSell-23,07626,394$7,898
Q1 2022Gardner Russo & QuinnSell-75,7071,092,971$420,674
Q1 2022First Eagle U.S. ValueBuy17111$43
Q1 2022Sequoia Financial AdvisorsBuy18926$356
Q1 2022Lountzis Asset ManagementSell-4412,699$4,887,718
Q4 2021Gardner Russo & QuinnSell-23,6191,168,678$514,826
Q4 2021First Eagle U.S. ValueSell-114,90694$41
Q4 2021Sequoia Financial AdvisorsBuy107908$400
Q4 2021Lountzis Asset ManagementSell-5812,743$5,613,546
Q3 2021Gardner Russo & QuinnSell-43,4781,192,297$407,384
Q3 2021Lountzis Asset ManagementSell-512,801$4,373,845
Q2 2021Gardner Russo & QuinnSell-34,7751,235,775$434,758
Q2 2021Sequoia Financial AdvisorsSell-22801$282

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.