WHITE MTNS INS GROUP LTD (G9618E107) Stock Institutional Trading Activity


WHITE MTNS INS GROUP LTD (G9618E107) 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 Renaissance Technologies LLC, Longleaf Partners, Sequoia Financial Advisors, Dodge & Cox Stock Fund, and Third Avenue Management. 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 2025Renaissance Technologies LLCSell-3501,501$3,119,123
Q3 2025Sequoia Financial AdvisorsSell-12818$1,366,591
Q3 2025Renaissance Technologies LLCBuy1,2511,851$3,093,984
Q3 2025Longleaf PartnersBuy10,55831,652$52,906,951
Q2 2025Sequoia Financial AdvisorsBuy4830$1,489,785
Q2 2025Longleaf PartnersBuy2,61021,094$37,878,918
Q1 2025Sequoia Financial AdvisorsSell-91826$1,590,009
Q1 2025Longleaf PartnersSell-76018,484$35,596,671
Q4 2024Renaissance Technologies LLCSell-1,300600$1,167,036
Q4 2024Sequoia Financial AdvisorsBuy33917$1,784,385
Q4 2024Longleaf PartnersSell-1,49419,244$37,430,734
Q3 2024Longleaf PartnersSell-68520,738$35,176
Q3 2024Sequoia Financial AdvisorsBuy689884$1,500,108
Q3 2024Renaissance Technologies LLCSell-1001,900$3,222,780
Q2 2024Longleaf PartnersSell-3,28521,423$38,935,231
Q2 2024Renaissance Technologies LLCSell-4002,000$3,634,900
Q1 2024Longleaf PartnersSell-7,73824,708$44,333,564
Q1 2024Renaissance Technologies LLCSell-7002,400$4,306
Q1 2024Sequoia Financial AdvisorsSell-330195$349,889
Q4 2023Longleaf PartnersSell-49932,446$48,831,555
Q4 2023Renaissance Technologies LLCSell-2003,100$4,666
Q4 2023Sequoia Financial AdvisorsBuy329525$790,131
Q3 2023Longleaf PartnersSell-9,27232,945$49,275,507
Q3 2023Renaissance Technologies LLCBuy5003,300$4,936
Q2 2023Longleaf PartnersSell-11,31642,217$58,635,613
Q2 2023Renaissance Technologies LLCBuy1,1002,800$3,889
Q1 2023Longleaf PartnersSell-1,96053,533$73,741,173
Q1 2023Renaissance Technologies LLCBuy6001,700$2,342
Q4 2022Longleaf PartnersSell-57,10455,493$78,485,414
Q4 2022Renaissance Technologies LLCBuy2001,100$1,556

Frequently asked questions about G9618E107 activity

  • Which institutional owners are buying G9618E107?

    Institutional owners buying G9618E107 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 G9618E107 activity?

    "Buy" means an investor increased their reported position in G9618E107 compared to the prior reporting period. This reflects growing exposure to WHITE MTNS INS GROUP LTD (G9618E107) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in G9618E107 increasing?

    Institutional interest in G9618E107 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.