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
Q4 2025Eagle Capital ManagementSell-7,893320,754$199,720,483
Q3 2025Gardner Russo & QuinnSell-25,242687,537$433,340,748
Q3 2025Sequoia Financial AdvisorsBuy52012,393$7,811,360
Q3 2025Eagle Capital ManagementSell-4,549328,647$207,139,445
Q3 2025Lountzis Asset ManagementSell-318,471$5,339,102
Q2 2025Gardner Russo & QuinnSell-1,473712,779$391,286,919
Q2 2025Sequoia Financial AdvisorsBuy56411,873$6,517,779
Q2 2025Eagle Capital ManagementSell-120333,196$182,911,502
Q1 2025Gardner Russo & QuinnBuy7,242714,252$341,505,138
Q1 2025Sequoia Financial AdvisorsBuy63711,309$5,407,310
Q1 2025Egerton Capital UKBuy83,062165,338$79,053,058
Q1 2025Eagle Capital ManagementBuy333,316333,316$159,368,379
Q1 2025Lountzis Asset ManagementSell-1528,502$4,275,656
Q4 2024Gardner Russo & QuinnSell-43,062707,010$365,170,539
Q4 2024Sequoia Financial AdvisorsBuy44310,672$5,511,896
Q4 2024Egerton Capital UKSell-122,39882,276$42,495,554
Q4 2024Lountzis Asset ManagementSell-3208,654$4,469,791
Q3 2024Gardner Russo & QuinnSell-13,987750,072$403,726,015
Q3 2024Sequoia Financial AdvisorsBuy2,95110,229$5,505,712
Q3 2024Egerton Capital UKBuy24,403204,674$110,165,781
Q3 2024Lountzis Asset ManagementSell-2858,974$4,830,255
Q2 2024Gardner Russo & QuinnSell-23,421764,059$413,966,956
Q2 2024Sequoia Financial AdvisorsBuy1,4497,278$3,943,251
Q2 2024Lountzis Asset ManagementSell-639,259$5,016,526
Q1 2024Gardner Russo & QuinnSell-153,088787,480$483,465,519
Q1 2024Sequoia Financial AdvisorsSell-6205,829$3,578,682
Q1 2024Lountzis Asset ManagementSell-4909,322$5,723,149
Q4 2023Gardner Russo & QuinnSell-18,195940,568$469,258,751
Q4 2023Sequoia Financial AdvisorsBuy5,4006,449$3,217,489
Q4 2023Lountzis Asset ManagementSell-639,812$4,895,305

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.