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White Mountains Insurance Group (WTM) Institutional Ownership

White Mountains Insurance Group logo
$2,174.70 -6.49 (-0.30%)
Closing price 07/13/2026 03:59 PM Eastern
Extended Trading
$2,173.49 -1.21 (-0.06%)
As of 07/13/2026 06:18 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Massive. Learn more.
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Institutional Ownership Changes (13F Filings) for White Mountains Insurance Group (NYSE:WTM)

Current
Institutional Ownership
Percentage
88.65%
Number of
Institutional Buyers
(last 12 months)
205
Total
Institutional Inflows
(last 12 months)
$613.11M
Number of
Institutional Sellers
(last 12 months)
152
Total
Institutional Outflows
(last 12 months)
$593.56M
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WTM Institutional Buying and Selling by Quarter

White Mountains Insurance Group Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
7/9/2026 Legacy Wealth Asset Management LLC329$682K0.1%+2.5%0.013%
7/8/2026 Reinhart Partners LLC.44,480$92.27M2.1%+19.0%1.794%
7/7/2026 GAMMA Investing LLC249$516K0.0%+23.3%0.010%
7/2/2026 Versant Capital Management Inc24$50K0.0%-51.0%0.001%
6/3/2026NewEdge Advisors LLC191$420K0.0%-2.6%0.008%
5/19/2026Bank of America Corp DE28,358$62.30M0.0%-1.6%1.143%
5/19/2026Edgestream Partners L.P.3,130$6.88M0.2%+491.7%0.126%
5/18/2026Amundi615$1.35M0.0%N/A0.025%
5/18/2026California State Teachers Retirement System2,887$6.34M0.0%+17.5%0.116%
5/18/2026Royal Bank of Canada1,195$2.63M0.0%+8.9%0.048%
5/18/2026Empowered Funds LLC1,284$2.82M0.0%+1,342.7%0.052%
5/16/2026The Manufacturers Life Insurance Company 614$1.35M0.0%+10.6%0.025%
5/16/2026Quantinno Capital Management LP9,784$21.50M0.0%+34.6%0.395%
5/15/2026Weiss Asset Management LP120$264K0.0%N/A0.005%
5/15/2026Bradley Foster & Sargent Inc. CT2,002$4.40M0.1%-63.3%0.081%
5/15/2026London Co. of Virginia57,131$125.54M0.8%-2.7%2.304%
5/15/2026Entropy Technologies LP470$1.03M0.0%-4.1%0.019%
5/15/2026Cannell & Spears LLC28,027$61.57M1.2%-0.3%1.130%
5/14/2026Renaissance Technologies LLC2,611$5.74M0.0%+74.0%0.105%
5/14/2026Public Employees Retirement System of Ohio751$1.65M0.0%-3.2%0.030%
5/14/2026Arrowstreet Capital Limited Partnership1,913$4.20M0.0%+135.9%0.077%
5/14/2026Capula Management Ltd921$2.02M0.0%N/A0.037%
5/14/2026Bank of Nova Scotia178$391K0.0%-5.8%0.007%
5/14/2026Sei Investments Co.11,098$24.38M0.0%+40.2%0.448%
5/14/2026State of Wyoming179$393K0.0%+33.6%0.007%
5/13/2026Cetera Investment Advisers346$761K0.0%-4.9%0.014%
5/13/2026NewEdge Wealth LLC105$231K0.0%-13.9%0.004%
5/13/2026First Trust Advisors LP3,058$6.72M0.0%-32.9%0.123%
5/8/2026Triad Investment Management2,513$5.52M6.1%-1.4%0.101%
5/8/2026PNC Financial Services Group Inc.546$1.20M0.0%+1.9%0.022%
5/7/2026WCM Investment Management LLC5,995$13.15M0.0%-43.9%0.242%
5/7/2026Dimensional Fund Advisors LP156,618$344.08M0.1%+0.0%6.315%
5/7/2026Swiss National Bank5,036$11.06M0.0%-1.0%0.203%
5/6/2026California Public Employees Retirement System6,414$14.09M0.0%-4.5%0.259%
5/6/2026Kera Capital Partners Inc.125$275K0.0%+9.6%0.005%
5/6/2026Bessemer Group Inc.19$42K0.0%-26.9%0.001%
5/6/2026Allspring Global Investments Holdings LLC18,612$40.55M0.1%-7.8%0.750%
5/5/2026Regency Capital Management Inc. DE1,535$3.37M1.5%-6.1%0.062%
5/5/2026Midwest Professional Planners LTD.395$868K0.2%+1.8%0.016%
5/5/2026Bank of New York Mellon Corp8,444$18.55M0.0%-4.4%0.341%
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5/5/2026Sanctuary Advisors LLC418$919K0.0%-12.0%0.017%
5/4/2026AMG National Trust Bank571$1.25M0.0%-4.0%0.023%
5/4/2026Chicago Partners Investment Group LLC467$1.06M0.0%-10.7%0.019%
5/2/2026Global Assets Advisory LLC15$33K0.0%N/A0.001%
5/1/2026Sequoia Financial Advisors LLC824$1.81M0.0%-9.1%0.033%
4/30/2026Equitable Trust Co.830$1.82M0.1%-1.2%0.033%
4/30/2026Hsbc Holdings PLC94$206K0.0%N/A0.004%
4/30/2026Kestra Advisory Services LLC122$268K0.0%-28.7%0.005%
4/30/2026Quantum Portfolio Management LLC96$211K0.0%N/A0.004%
4/28/2026Lee Danner & Bass Inc.3,203$7.04M0.4%+3.2%0.129%
4/27/2026HB Wealth Management LLC151$332K0.0%+16.2%0.006%
4/27/2026Elevation Point Wealth Partners LLC297$653K0.0%+33.2%0.012%
4/25/2026Eagle Bay Advisors LLC104$228K0.2%+14.3%0.004%
4/25/2026Keybank National Association OH161$354K0.0%-8.5%0.006%
4/22/2026Janney Montgomery Scott LLC510$1.12M0.0%+5.8%0.021%
4/22/2026Pictet Asset Management Holding SA430$945K0.0%+7.5%0.017%
4/22/2026Sterling Capital Management LLC83$182K0.0%-43.2%0.003%
4/22/2026Venturi Wealth Management LLC243$534K0.0%+10.0%0.010%
4/20/2026Blue Trust Inc.77$169K0.0%-13.5%0.003%
4/16/2026SG Americas Securities LLC201$442K0.0%+204.5%0.008%
4/16/2026 Lexington Hill Partners LLC520$1.14M0.6%N/A0.021%
3/17/2026Rockefeller Capital Management L.P.300$624K0.0%+36.4%0.012%
3/9/2026Corient Private Wealth LLC906$1.88M0.0%+51.5%0.037%
3/3/2026Caitong International Asset Management Co. Ltd61$127K0.0%+335.7%0.002%
2/24/2026River Road Asset Management LLC120,880$251.19M2.8%+10.3%4.752%
2/23/2026Kera Capital Partners Inc.114$233K0.0%N/A0.004%
2/19/2026T. Rowe Price Investment Management Inc.44,560$92.60M0.1%-6.7%1.754%
2/19/2026Invesco Ltd.2,995$6.22M0.0%-9.7%0.118%
2/19/2026Corient Private Wealth LLC906$1.88M0.0%+51.5%0.036%
2/18/2026Mercer Global Advisors Inc. ADV715$1.49M0.0%+386.4%0.028%
2/18/2026Fuller & Thaler Asset Management Inc.108,172$224.79M0.8%+0.1%4.252%
2/18/2026NewEdge Advisors LLC196$407K0.0%+15.3%0.008%
2/18/2026Empowered Funds LLC89$185K0.0%N/A0.003%
2/18/2026XTX Topco Ltd229$476K0.0%N/A0.009%
2/18/2026Quadrature Capital Ltd360$748K0.0%N/A0.014%
2/18/2026Millennium Management LLC856$1.78M0.0%-8.4%0.034%
2/18/2026Main Street Financial Solutions LLC835$1.74M0.1%-33.8%0.033%
2/18/2026Gotham Asset Management LLC6,716$13.96M0.1%-2.7%0.264%
2/18/2026First Manhattan CO. LLC.100$208K0.0%N/A0.004%
2/17/2026AQR Capital Management LLC4,476$9.30M0.0%-24.3%0.176%
2/17/2026Jain Global LLC559$1.16M0.0%+87.0%0.022%
2/17/2026CHICAGO TRUST Co NA100$208K0.0%N/A0.004%
2/17/2026Jump Financial LLC658$1.37M0.0%N/A0.026%
2/17/2026Price T Rowe Associates Inc. MD1,990$4.14M0.0%+5.7%0.078%
2/17/2026T. Rowe Price Investment Management Inc.6,662$13.84M0.0%-86.1%0.262%
2/17/2026Elkhorn Partners Limited Partnership13,598$28.26M17.8%-8.2%0.535%
2/17/2026Public Employees Retirement System of Ohio776$1.61M0.0%-4.7%0.031%
2/17/2026California State Teachers Retirement System2,457$5.11M0.0%+1.0%0.097%
2/17/2026Russell Investments Group Ltd.397$826K0.0%+13.1%0.016%
2/17/2026London Co. of Virginia58,697$122.00M0.7%-12.1%2.311%
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2/17/2026State of Wisconsin Investment Board138$287K0.0%-44.6%0.005%
2/17/2026&PARTNERS638$1.33M0.0%+2.4%0.025%
2/17/2026Royal Bank of Canada1,097$2.28M0.0%-38.0%0.043%
2/16/2026Squarepoint Ops LLC706$1.47M0.0%+296.6%0.028%
2/16/2026Vanguard Personalized Indexing Management LLC253$526K0.0%+5.4%0.010%
2/16/2026Prospector Partners LLC490$1.02M2.2%-87.0%0.019%
2/16/2026Parker Investment Management LLC475$987K0.1%-5.0%0.019%
2/16/2026MML Investors Services LLC2,935$6.10M0.0%+2.9%0.116%
2/16/2026Mariner LLC402$835K0.0%+87.9%0.016%
2/16/2026Nicolet Advisory Services LLC230$474K0.0%+8.0%0.009%


WTM Institutional Ownership - Frequently Asked Questions

During the previous two years, 347 institutional investors and hedge funds held shares of White Mountains Insurance Group. The most heavily invested institutionals were Vanguard Group Inc. ($489.79M), Dimensional Fund Advisors LP ($344.08M), River Road Asset Management LLC ($251.19M), Fuller & Thaler Asset Management Inc. ($224.79M), Cooke & Bieler LP ($221.47M), Fiduciary Management Inc. WI ($187.72M), and Morgan Stanley ($170.72M).Learn more on White Mountains Insurance Group's institutional investors.

88.65% of White Mountains Insurance Group's stock is owned by institutional investors. Learn more on WTM's institutional investor holdings.

Of the 294 institutional investors that purchased White Mountains Insurance Group's stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: GAMMA Investing LLC ($146.53K), Cooke & Bieler LP ($107.85K), Norges Bank ($93.35K), Proficio Capital Partners LLC ($46.69K), Gendell Jeffrey L ($32.52K), Raymond James Financial Inc. ($32.47K), and Fiduciary Management Inc. WI ($22.68K).

Institutional investors have bought a total of 322,524 shares in the last 24 months. This purchase volume represents approximately $613.11M in transactions.

Of the 151 institutional investors that sold White Mountains Insurance Group's stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: Morgan Stanley ($56.71K), T. Rowe Price Investment Management Inc. ($44.32K), First Trust Advisors LP ($18.75K), Robeco Institutional Asset Management B.V. ($18.53K), Vanguard Group Inc. ($13.47K), Allspring Global Investments Holdings LLC ($13.09K), and Boston Partners ($12.48K).

Institutional investors have sold a total of 298,401 shares in the last 24 months. This volume of shares sold represents approximately $593.56M in transactions.


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This page (NYSE:WTM) was last updated on 7/14/2026 by MarketBeat.com Staff.
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