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WTM Insider Trading

Insider Ownership Percentage: 3.20%
Insider Buying (Last 12 Months): $0.00
Insider Selling (Last 12 Months): $338,004.15

White Mountains Insurance Group Insider Trading History Chart

This chart shows the insider buying and selling history at White Mountains Insurance Group by year and by quarter.

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White Mountains Insurance Group Share Price & Price History

Current Price: $2,225.39
Price Change: ▲ Price Increase of +36.045 (1.65%)
As of 02/24/2026 04:59 PM ET

This chart shows the closing price history over time for WTM up to the past year.

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Days: 30 | 90 | 365

White Mountains Insurance Group Insider Trading History

Transaction DateInsider NameTitleBuy/SellNumber of SharesAverage Share PriceTotal TransactionShares Held After TransactionDetails
12/16/2025Philip A GelstonDirectorSell165$2,048.51$338,004.151,568View SEC Filing Icon  
5/7/2024Mountains Insurance Grou WhiteMajor ShareholderSell5,000,200$19.00$95,003,800.0017,856,614View SEC Filing Icon  
11/17/2023Weston M. HicksDirectorBuy1,000$1,480.56$1,480,560.002,306View SEC Filing Icon  
6/30/2023Mountains Insurance Grou WhiteDirectorBuy5,916,816$10.00$59,168,160.0022,856,814View SEC Filing Icon  
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SEC Filings (Institutional Ownership Changes) for White Mountains Insurance Group (NYSE:WTM)

88.65% of White Mountains Insurance Group stock is owned by institutions. Institutional ownership can be a sign of analyst confidence in the fundamentals of the stock.

Institutional Buying and Selling by Quarter

This chart shows the instiutional buying and selling at WTM by year and by quarter.

Skip Institutional Buying and Selling Chart and Table DataRead Chart Data in Institutional Trading History Table

White Mountains Insurance Group Institutional Trading History

Reporting DateHedge FundShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
2/24/2026River Road Asset Management LLC120,880$251.19M2.8%+10.3%4.752%Search for SEC Filing on Google Icon
2/23/2026Kera Capital Partners Inc.114$0.23M0.0%N/A0.004%Search for SEC Filing on Google Icon
2/19/2026T. Rowe Price Investment Management Inc.44,560$92.60M0.1%-6.7%1.754%Search for SEC Filing on Google Icon
2/19/2026Invesco Ltd.2,995$6.22M0.0%-9.7%0.118%Search for SEC Filing on Google Icon
2/19/2026Corient Private Wealth LLC906$1.88M0.0%+51.5%0.036%Search for SEC Filing on Google Icon
2/18/2026Mercer Global Advisors Inc. ADV715$1.49M0.0%+386.4%0.028%Search for SEC Filing on Google Icon
2/18/2026Fuller & Thaler Asset Management Inc.108,172$224.79M0.8%+0.1%4.252%Search for SEC Filing on Google Icon
2/18/2026NewEdge Advisors LLC196$0.41M0.0%+15.3%0.008%Search for SEC Filing on Google Icon
2/18/2026Empowered Funds LLC89$0.19M0.0%N/A0.003%Search for SEC Filing on Google Icon
2/18/2026XTX Topco Ltd229$0.48M0.0%N/A0.009%Search for SEC Filing on Google Icon
2/18/2026Quadrature Capital Ltd360$0.75M0.0%N/A0.014%Search for SEC Filing on Google Icon
2/18/2026Millennium Management LLC856$1.78M0.0%-8.4%0.034%Search for SEC Filing on Google Icon
2/18/2026Main Street Financial Solutions LLC835$1.74M0.1%-33.8%0.033%Search for SEC Filing on Google Icon
2/18/2026Gotham Asset Management LLC6,716$13.96M0.1%-2.7%0.264%Search for SEC Filing on Google Icon
2/18/2026First Manhattan CO. LLC.100$0.21M0.0%N/A0.004%Search for SEC Filing on Google Icon
2/17/2026AQR Capital Management LLC4,476$9.30M0.0%-24.3%0.176%Search for SEC Filing on Google Icon
2/17/2026Jain Global LLC559$1.16M0.0%+87.0%0.022%Search for SEC Filing on Google Icon
2/17/2026CHICAGO TRUST Co NA100$0.21M0.0%N/A0.004%Search for SEC Filing on Google Icon
2/17/2026Jump Financial LLC658$1.37M0.0%N/A0.026%Search for SEC Filing on Google Icon
2/17/2026Price T Rowe Associates Inc. MD1,990$4.14M0.0%+5.7%0.078%Search for SEC Filing on Google Icon
2/17/2026T. Rowe Price Investment Management Inc.6,662$13.84M0.0%-86.1%0.262%Search for SEC Filing on Google Icon
2/17/2026Elkhorn Partners Limited Partnership13,598$28.26M17.8%-8.2%0.535%Search for SEC Filing on Google Icon
2/17/2026Public Employees Retirement System of Ohio776$1.61M0.0%-4.7%0.031%Search for SEC Filing on Google Icon
2/17/2026California State Teachers Retirement System2,457$5.11M0.0%+1.0%0.097%Search for SEC Filing on Google Icon
2/17/2026Russell Investments Group Ltd.397$0.83M0.0%+13.1%0.016%Search for SEC Filing on Google Icon
2/17/2026London Co. of Virginia58,697$122M0.7%-12.1%2.311%Search for SEC Filing on Google Icon
2/17/2026State of Wisconsin Investment Board138$0.29M0.0%-44.6%0.005%Search for SEC Filing on Google Icon
2/17/2026&PARTNERS638$1.33M0.0%+2.4%0.025%Search for SEC Filing on Google Icon
2/17/2026Royal Bank of Canada1,097$2.28M0.0%-38.0%0.043%Search for SEC Filing on Google Icon
2/16/2026Squarepoint Ops LLC706$1.47M0.0%+296.6%0.028%Search for SEC Filing on Google Icon
2/16/2026Vanguard Personalized Indexing Management LLC253$0.53M0.0%+5.4%0.010%Search for SEC Filing on Google Icon
2/16/2026Prospector Partners LLC490$1.02M2.2%-87.0%0.019%Search for SEC Filing on Google Icon
2/16/2026Parker Investment Management LLC475$0.99M0.1%-5.0%0.019%Search for SEC Filing on Google Icon
2/16/2026MML Investors Services LLC2,935$6.10M0.0%+2.9%0.116%Search for SEC Filing on Google Icon
2/16/2026Mariner LLC402$0.84M0.0%+87.9%0.016%Search for SEC Filing on Google Icon
2/16/2026Nicolet Advisory Services LLC230$0.47M0.0%+8.0%0.009%Search for SEC Filing on Google Icon
2/16/2026Focus Partners Wealth1,610$3.10M0.0%+19.0%0.063%Search for SEC Filing on Google Icon
2/16/2026Entropy Technologies LP490$1.02M0.1%N/A0.019%Search for SEC Filing on Google Icon
2/16/2026Arax Advisory Partners281$0.59M0.0%-44.7%0.011%Search for SEC Filing on Google Icon
2/16/2026Barclays PLC559$1.16M0.0%-41.3%0.022%Search for SEC Filing on Google Icon
2/16/2026Brown Advisory Inc.18,956$39.39M0.1%-6.8%0.746%Search for SEC Filing on Google Icon
2/16/2026Ackerman Asset Management LLC100$0.21M0.1%N/A0.004%Search for SEC Filing on Google Icon
2/13/2026Kestra Advisory Services LLC171$0.36M0.0%+14.8%0.007%Search for SEC Filing on Google Icon
2/13/2026Parkside Financial Bank & Trust62$0.13M0.0%-8.8%0.002%Search for SEC Filing on Google Icon
2/13/2026Marshall Wace LLP1,098$2.28M0.0%N/A0.043%Search for SEC Filing on Google Icon
2/13/2026The Manufacturers Life Insurance Company 555$1.15M0.0%+3.9%0.022%Search for SEC Filing on Google Icon
2/13/2026Johnson Investment Counsel Inc.115$0.24M0.0%N/A0.005%Search for SEC Filing on Google Icon
2/13/2026Gendell Jeffrey L32,520$67.58M1.2%N/A1.280%Search for SEC Filing on Google Icon
2/13/2026Quarry LP26$54K0.0%-16.1%0.001%Search for SEC Filing on Google Icon
2/13/2026Smartleaf Asset Management LLC14$29K0.0%+100.0%0.001%Search for SEC Filing on Google Icon
2/13/2026Bank of Nova Scotia189$0.39M0.0%-6.4%0.007%Search for SEC Filing on Google Icon
2/13/2026Morgan Stanley82,151$170.72M0.0%-40.8%3.234%Search for SEC Filing on Google Icon
2/13/2026First Trust Advisors LP4,555$9.47M0.0%N/A0.179%Search for SEC Filing on Google Icon
2/13/2026Charles Schwab Investment Management Inc.23,238$48.29M0.0%-4.1%0.915%Search for SEC Filing on Google Icon
2/13/2026Police & Firemen s Retirement System of New Jersey1,070$2.22M0.0%-4.2%0.042%Search for SEC Filing on Google Icon
2/13/2026State Street Corp50,663$105.28M0.0%-6.9%1.995%Search for SEC Filing on Google Icon
2/13/2026Boston Partners76,911$159.73M0.2%-8.9%3.028%Search for SEC Filing on Google Icon
2/13/2026Storgate LLC113$0.24M0.2%N/A0.004%Search for SEC Filing on Google Icon
2/13/2026UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC7,655$15.91M0.0%+109,257.1%0.301%Search for SEC Filing on Google Icon
2/13/2026Wells Fargo & Company MN9,141$18.99M0.0%-2.3%0.360%Search for SEC Filing on Google Icon
2/13/2026Lord Abbett & CO. LLC33,796$70.23M0.2%-8.5%1.331%Search for SEC Filing on Google Icon
2/13/2026Quadrant Capital Group LLC128$0.27M0.0%-3.8%0.005%Search for SEC Filing on Google Icon
2/12/2026Federation des caisses Desjardins du Quebec55$0.11M0.0%+10.0%0.002%Search for SEC Filing on Google Icon
2/12/2026Jane Street Group LLC1,707$3.55M0.0%-64.6%0.067%Search for SEC Filing on Google Icon
2/12/2026HRT Financial LP133$0.28M0.0%-96.3%0.005%Search for SEC Filing on Google Icon
2/12/2026Commonwealth Equity Services LLC271$0.56M0.0%-9.7%0.011%Search for SEC Filing on Google Icon
2/12/2026State Board of Administration of Florida Retirement System2,792$5.80M0.0%-11.1%0.110%Search for SEC Filing on Google Icon
2/12/2026Renaissance Technologies LLC1,501$3.12M0.0%-18.9%0.059%Search for SEC Filing on Google Icon
2/12/2026Dimensional Fund Advisors LP156,604$325.43M0.1%-0.4%6.166%Search for SEC Filing on Google Icon
2/12/2026Ensign Peak Advisors Inc200$0.42M0.0%-60.0%0.008%Search for SEC Filing on Google Icon
2/12/2026Elevation Point Wealth Partners LLC223$0.46M0.0%+42.0%0.009%Search for SEC Filing on Google Icon
2/12/2026Bradley Foster & Sargent Inc. CT5,456$11.34M0.2%-1.6%0.215%Search for SEC Filing on Google Icon
2/12/2026New York State Common Retirement Fund2,513$5.22M0.0%-0.2%0.099%Search for SEC Filing on Google Icon
2/12/2026Fuller & Thaler Asset Management Inc.108,172$224.79M0.8%+0.1%4.259%Search for SEC Filing on Google Icon
2/12/2026Wedbush Securities Inc.229$0.48M0.0%+2.2%0.009%Search for SEC Filing on Google Icon
2/12/2026Brown Brothers Harriman & Co.19$39K0.0%N/A0.001%Search for SEC Filing on Google Icon
2/12/2026Swiss National Bank5,086$10.57M0.0%+2.8%0.200%Search for SEC Filing on Google Icon
2/12/2026Principal Securities Inc.216$0.45M0.0%+2.9%0.009%Search for SEC Filing on Google Icon
2/12/2026Great Lakes Advisors LLC110$0.23M0.0%N/A0.004%Search for SEC Filing on Google Icon
2/12/2026Equity Investment Corp113$0.24M0.0%N/A0.004%Search for SEC Filing on Google Icon
2/12/2026Nuveen LLC3,475$7.22M0.0%+0.5%0.137%Search for SEC Filing on Google Icon
2/12/2026Private Management Group Inc.726$1.51M0.0%N/A0.029%Search for SEC Filing on Google Icon
2/11/2026Empowered Funds LLC89$0.19M0.0%N/A0.003%Search for SEC Filing on Google Icon
2/11/2026Janney Montgomery Scott LLC482$1M0.0%+4.3%0.019%Search for SEC Filing on Google Icon
2/11/2026GW&K Investment Management LLC8,621$17.92M0.2%+7.6%0.339%Search for SEC Filing on Google Icon
2/11/2026Brandes Investment Partners LP665$1.38M0.0%+8.3%0.026%Search for SEC Filing on Google Icon
2/11/2026Horizon Kinetics Asset Management LLC13,121$27.27M0.4%+0.3%0.517%Search for SEC Filing on Google Icon
2/11/2026Cerity Partners LLC3,543$7.36M0.0%+82.6%0.139%Search for SEC Filing on Google Icon
2/11/2026LPL Financial LLC1,965$4.08M0.0%-14.8%0.077%Search for SEC Filing on Google Icon
2/11/2026Brandywine Global Investment Management LLC3,226$6.70M0.0%-3.0%0.127%Search for SEC Filing on Google Icon
2/11/2026O Shaughnessy Asset Management LLC934$1.94M0.0%-5.0%0.037%Search for SEC Filing on Google Icon
2/11/2026JPMorgan Chase & Co.1,806$3.75M0.0%-58.2%0.071%Search for SEC Filing on Google Icon
2/11/2026Clearbridge Investments LLC100$0.21M0.0%N/A0.004%Search for SEC Filing on Google Icon
2/11/2026Syon Capital LLC140$0.29M0.0%N/A0.006%Search for SEC Filing on Google Icon
2/11/2026Fiduciary Management Inc. WI90,333$187.72M2.1%-4.3%3.556%Search for SEC Filing on Google Icon
2/11/2026Vise Technologies Inc.100$0.21M0.0%-47.4%0.004%Search for SEC Filing on Google Icon
2/11/2026Regency Capital Management Inc. DE1,635$3.40M1.4%+101.6%0.064%Search for SEC Filing on Google Icon
2/11/2026State of Wyoming134$0.28M0.0%+76.3%0.005%Search for SEC Filing on Google Icon
2/10/2026TD Asset Management Inc1,000$2.08M0.0%-14.2%0.039%Search for SEC Filing on Google Icon
2/10/2026Reinhart Partners LLC.43,973$91.41M2.7%+5.7%1.731%Search for SEC Filing on Google Icon
Data available starting January 2016

See Full Table
White Mountains Insurance Group logo
White Mountains Insurance Group, Ltd., through its subsidiaries, provides insurance and other financial services in the United States. The company operates through HG Global/BAM, Ark/WM Outrigger, Kudu, and Other Operations segments. The HG Global/BAM segment provides insurance on municipal bonds issued to finance public purposes, such as schools, utilities, and transportation facilities, as well as reinsurance protection services. The Ark/WM Outrigger segment offers reinsurance and insurance, including property, marine and energy, accident and health, casualty, and specialty products. The Kudu segment provides capital solutions to boutique asset and wealth managers for generational ownership transfers, management buyouts, acquisitions and growth finances, and legacy partner liquidity, as well as strategic assistance to investees. The Other Operations segment offers insurance solutions to travel industry through broker channel and on a direct-to-consumer basis; and manages separate accounts and pooled investment vehicles for insurance-linked securities sectors, including catastrophe bonds, collateralized reinsurance investments, and industry loss warranties of third-party clients. White Mountains Insurance Group, Ltd. was incorporated in 1980 and is headquartered in Hamilton, Bermuda.
Read More on White Mountains Insurance Group

Today's Range

Now: $2,225.39
Low: $2,185.50
High: $2,228.98

50 Day Range

MA: $2,091.74
Low: $2,037.06
High: $2,236.02

52 Week Range

Now: $2,225.39
Low: $1,648.00
High: $2,246.88

Volume

17,226 shs

Average Volume

16,937 shs

Market Capitalization

$5.66 billion

P/E Ratio

5.15

Dividend Yield

0.05%

Beta

0.36

Who are the company insiders with the largest holdings of White Mountains Insurance Group?

White Mountains Insurance Group's top insider shareholders include:
  1. Mountains Insurance Grou White (Major Shareholder)
  2. Philip A Gelston (Director)
Learn More about top insider investors at White Mountains Insurance Group.

Who are the major institutional investors of White Mountains Insurance Group?

White Mountains Insurance Group's top institutional shareholders include:
  1. Vanguard Group Inc. — 9.28%
  2. Dimensional Fund Advisors LP — 6.17%
  3. Fuller & Thaler Asset Management Inc. — 4.26%
  4. Fuller & Thaler Asset Management Inc. — 4.25%
  5. Cooke & Bieler LP — 4.20%
  6. Fiduciary Management Inc. WI — 3.56%
Learn More about top institutional investors of White Mountains Insurance Group stock.

Which major investors are selling White Mountains Insurance Group stock?

In the previous quarter, WTM stock was sold by these institutional investors:
  1. Morgan Stanley
  2. T. Rowe Price Investment Management Inc.
  3. Robeco Institutional Asset Management B.V.
  4. Allspring Global Investments Holdings LLC
  5. Vanguard Group Inc.
  6. London Co. of Virginia
  7. Boston Partners
  8. UBS Group AG

Which major investors are buying White Mountains Insurance Group stock?

During the last quarter, WTM stock was purchased by institutional investors including:
  1. Gendell Jeffrey L
  2. Norges Bank
  3. M&T Bank Corp
  4. UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC
  5. First Trust Advisors LP
  6. Triad Investment Management
  7. Reinhart Partners LLC.
  8. BNP Paribas Financial Markets