WHITE MTNS INS GROUP LTD (G9618E107) Institutional Ownership Changes & 13F Activity

WHITE MTNS INS GROUP LTD (G9618E107) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Longleaf Partners, Renaissance Technologies LLC, Sequoia Financial Advisors, Dodge & Cox Stock Fund, and Third Avenue Management.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
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
Q4 2022Sequoia Financial AdvisorsBuy196196$277,209
Q3 2022Longleaf PartnersSell-13,006112,597$146,716
Q3 2022Renaissance Technologies LLCSell-2,600900$1,173
Q2 2022Renaissance Technologies LLCSell-1,2003,500$4,361
Q2 2022Dodge & Cox Stock FundBuy300300$374
Q2 2022Longleaf PartnersBuy100125,603$156,518
Q1 2022Longleaf PartnersBuy73,901125,503$142,602
Q1 2022Renaissance Technologies LLCSell-8,4004,700$5,340
Q4 2021Longleaf PartnersBuy51,60251,602$52,319
Q4 2021Renaissance Technologies LLCBuy80013,100$13,282
Q3 2021Renaissance Technologies LLCSell-3,00012,300$13,156
Q2 2021Renaissance Technologies LLCSell-3,00015,300$17,565
Q1 2021Renaissance Technologies LLCBuy14,56918,300$20,403
Q4 2020Renaissance Technologies LLCSell-3,9693,731$3,733
Q3 2020Renaissance Technologies LLCSell-2,9007,700$5,998
Q2 2020Renaissance Technologies LLCSell-60010,600$9,412
Q1 2020Renaissance Technologies LLCSell-2,50011,200$10,192
Q4 2019Renaissance Technologies LLCBuy1,20013,700$15,282
Q3 2019Renaissance Technologies LLCBuy6,70012,500$13,500
Q2 2019Renaissance Technologies LLCSell-10,4005,800$5,924
Q1 2019Renaissance Technologies LLCBuy1,00016,200$14,993
Q4 2018Renaissance Technologies LLCSell-52415,200$13,037
Q3 2018Renaissance Technologies LLCBuy4,71315,724$14,716
Q3 2018Third Avenue ManagementSell-9628,649$26,812
Q2 2018Third Avenue ManagementSell-5,45028,745$26,061
Q1 2018Renaissance Technologies LLCSell-1,18911,011$9,057

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.

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