(MRTN) Stock Institutional Trading Activity


(MRTN) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q3 2025), investors with some of the largest reported share count changes include Renaissance Technologies LLC. 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 2025Renaissance Technologies LLCBuy249,547516,897$5,510,122
Q2 2025Renaissance Technologies LLCBuy217,084267,350$3,472,877
Q1 2024Renaissance Technologies LLCBuy20,76650,266$929
Q4 2023Renaissance Technologies LLCSell-70,20729,500$619
Q3 2023Renaissance Technologies LLCBuy66,50799,707$1,965
Q2 2023Renaissance Technologies LLCSell-77,05033,200$714
Q1 2023Renaissance Technologies LLCBuy80,950110,250$2,310
Q4 2022Renaissance Technologies LLCSell-11,60029,300$580
Q3 2022Renaissance Technologies LLCSell-254,75040,900$784
Q2 2022Renaissance Technologies LLCBuy120,800295,650$4,973
Q1 2022Renaissance Technologies LLCBuy142,018174,850$3,105
Q4 2021Renaissance Technologies LLCSell-112,41832,832$563
Q2 2021Renaissance Technologies LLCSell-209,500145,250$2,395
Q1 2021Renaissance Technologies LLCBuy331,300354,750$6,020
Q4 2020Renaissance Technologies LLCSell-155,48423,450$404
Q3 2020Renaissance Technologies LLCBuy76,034178,934$2,920
Q2 2020Renaissance Technologies LLCBuy91,300102,900$2,589
Q4 2019Renaissance Technologies LLCSell-34,90011,600$249
Q3 2019Renaissance Technologies LLCSell-6,20046,500$966
Q2 2019Renaissance Technologies LLCSell-16,46152,700$957
Q1 2019Renaissance Technologies LLCBuy1,00069,161$1,233
Q4 2018Renaissance Technologies LLCBuy53,36168,161$1,104
Q1 2018Renaissance Technologies LLCSell-4,91714,800$337
Q2 2017Renaissance Technologies LLCBuy50019,717$540
Q4 2016Renaissance Technologies LLCSell-34,60019,217$448
Q1 2016Renaissance Technologies LLCBuy17,40053,817$1,007
Q3 2015Renaissance Technologies LLCBuy25,50036,417$589
Q2 2015Renaissance Technologies LLCSell-48,10010,917$237
Q3 2014Renaissance Technologies LLCSell-17,80059,017$1,051
Q2 2013Renaissance Technologies LLCBuy76,81776,817$1,204

Frequently asked questions about MRTN activity

  • Which institutional owners are buying MRTN?

    Institutional owners buying MRTN 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 MRTN activity?

    "Buy" means an investor increased their reported position in MRTN compared to the prior reporting period. This reflects growing exposure to MRTN rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in MRTN increasing?

    Institutional interest in MRTN 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.