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

WHITE MTNS INS GROUP LTD (WTM). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include T. Rowe Price Investment Management, Inc., Morgan Stanley, M&T Bank Corp, Boussard & Gavaudan Investment Management Llp, and Longleaf Partners.

InstitutionTypeChange in sharesChange Position %SharesReported stock balancePortfolio quarterFiling date
Neuberger Berman Group LlcSell-4,939-3.8%124,715$273.99MQ1 2026Oct 27, 2026
M&T Bank CorpSell-18,387-99.1%162$355.91KQ1 2026Sep 04, 2026
Wells Fargo & Company/MnSell-359-3.9%8,782$19.29MQ1 2026Jul 08, 2026
Edgestream Partners, L.P.Buy+2,601+491.7%3,130$6.88MQ1 2026May 18, 2026
AmundiBuy+615—615$1.35MQ1 2026May 18, 2026
Bank Of America CorpSell-448-1.6%28,358$62.30MQ1 2026May 18, 2026
California State Teachers Retirement SystemBuy+430+17.5%2,887$6.34MQ1 2026May 18, 2026
T. Rowe Price Investment Management, Inc.Buy+34,851+523.1%41,513$91.20MQ1 2026May 15, 2026
Morgan StanleySell-22,856-27.8%59,295$130.27MQ1 2026May 15, 2026
Boussard & Gavaudan Investment Management LlpBuy+13,975—13,975$30.97MQ1 2026May 15, 2026
Longleaf PartnersSell-12,788-40.4%18,864$41.44MQ1 2026May 15, 2026
Susquehanna International Group, LlpBuy+10,833+8206.8%10,965$24.09MQ1 2026May 15, 2026
Goldman Sachs Group IncBuy+10,523+200.1%15,783$34.67MQ1 2026May 15, 2026
Select Equity Group, L.P.Sell-9,153-46.4%10,560$23.20MQ1 2026May 15, 2026
American Century Companies IncBuy+7,413+828.3%8,308$18.25MQ1 2026May 15, 2026
Gendell Jeffrey LBuy+5,294+16.3%37,814$83.08MQ1 2026May 15, 2026
Victory Capital Management IncBuy+4,849+77.0%11,145$24.49MQ1 2026May 15, 2026
Bradley Foster & Sargent Inc/CtSell-3,454-63.3%2,002$4.40MQ1 2026May 15, 2026
Aqr Capital Management LlcBuy+3,262+72.9%7,738$17.00MQ1 2026May 15, 2026
Marshall Wace, LlpBuy+2,780+253.2%3,878$8.52MQ1 2026May 15, 2026
Quantinno Capital Management LpBuy+2,513+34.6%9,784$21.50MQ1 2026May 15, 2026
Gotham Asset Management, LlcBuy+2,331+34.7%9,047$19.88MQ1 2026May 15, 2026
Cerity Partners LlcSell-1,676-47.3%1,867$4.10MQ1 2026May 15, 2026
London Co Of VirginiaSell-1,566-2.7%57,131$125.54MQ1 2026May 15, 2026
Wallace Capital Management Inc.Sell-1,552-1.9%78,795$173.11MQ1 2026May 15, 2026
State Street CorpSell-1,505-3.0%49,158$108.00MQ1 2026May 15, 2026
Citadel Advisors LlcBuy+1,410+118.2%2,603$5.72MQ1 2026May 15, 2026
Dark Forest Capital Management LpSell-1,360-37.6%2,255$4.95MQ1 2026May 15, 2026
Empowered Funds, LlcBuy+1,195+1342.7%1,284$2.82MQ1 2026May 15, 2026
Tidal Investments LlcBuy+1,144+560.8%1,348$2.96MQ1 2026May 15, 2026
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Frequently asked questions about WTM activity

  • Which institutional owners are buying WTM?

    Institutional owners buying WTM 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 WTM activity?

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

  • Is institutional interest in WTM increasing?

    Institutional interest in WTM 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.