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WTM Insider Trading

Insider Ownership Percentage: 3.00%
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: $2,137.69
Price Change: ▲ Price Increase of +26.739 (1.27%)
As of 08/24/2026 10:20 AM 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  
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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
8/24/2026California State Teachers Retirement System5,724,630$11.87B0.0%+198,189.9%239.825%Search for SEC Filing on Google Icon
8/22/2026Syon Capital LLC153$0.32M0.0%-6.7%0.006%Search for SEC Filing on Google Icon
8/21/2026Athena Investment Management114$0.24M0.1%-49.1%0.005%Search for SEC Filing on Google Icon
8/21/2026Midwest Professional Planners LTD.1,164$2.41M0.5%+194.7%0.049%Search for SEC Filing on Google Icon
8/20/2026BTG Pactual Asset Management US LLC289$0.60M0.0%N/A0.012%Search for SEC Filing on Google Icon
8/20/2026Private Management Group Inc.806$1.67M0.0%-2.1%0.034%Search for SEC Filing on Google Icon
8/19/2026UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC61$0.13M0.0%-99.2%0.003%Search for SEC Filing on Google Icon
8/19/2026Hsbc Holdings PLC217$0.45M0.0%+130.9%0.009%Search for SEC Filing on Google Icon
8/19/2026Wellington Management Group LLP14,532$30.13M0.0%-2.4%0.608%Search for SEC Filing on Google Icon
8/19/2026Boussard & Gavaudan Gestion Sas11,679$24.46M1.2%N/A0.489%Search for SEC Filing on Google Icon
8/18/2026Beacon Pointe Advisors LLC178$0.37M0.0%N/A0.007%Search for SEC Filing on Google Icon
8/18/2026Empowered Funds LLC103$0.21M0.0%N/A0.004%Search for SEC Filing on Google Icon
8/18/2026Public Employees Retirement System of Ohio721$1.50M0.0%N/A0.030%Search for SEC Filing on Google Icon
8/17/2026Corient Private Wealth LP792$1.64M0.0%N/A0.033%Search for SEC Filing on Google Icon
8/17/2026Bank of America Corp DE25,028$51.89M0.0%N/A1.047%Search for SEC Filing on Google Icon
8/15/2026Wallace Capital Management Inc.80,067$166.01M18.2%N/A3.350%Search for SEC Filing on Google Icon
8/15/2026Freestone Grove Partners LP240$0.50M0.0%N/A0.010%Search for SEC Filing on Google Icon
8/15/2026Jupiter Topco LLC1,123$2.32M0.0%N/A0.047%Search for SEC Filing on Google Icon
8/14/2026Hsbc Holdings PLC217$0.45M0.0%N/A0.009%Search for SEC Filing on Google Icon
8/14/2026Legal & General Group Plc2,257$4.68M0.0%N/A0.094%Search for SEC Filing on Google Icon
8/14/2026The Manufacturers Life Insurance Company 617$1.28M0.0%N/A0.026%Search for SEC Filing on Google Icon
8/13/2026Winmill & CO. Inc.4,800$9.95M2.2%N/A0.201%Search for SEC Filing on Google Icon
8/13/2026Sanctuary Advisors LLC387$0.80M0.0%N/A0.016%Search for SEC Filing on Google Icon
8/13/2026Bank of Nova Scotia158$0.33M0.0%N/A0.007%Search for SEC Filing on Google Icon
8/12/2026Elevation Point Wealth Partners LLC294$0.61M0.0%N/A0.012%Search for SEC Filing on Google Icon
8/12/2026Northwestern Mutual Wealth Management Co.40$83K0.0%N/A0.002%Search for SEC Filing on Google Icon
8/12/2026Quantbot Technologies LP112$0.23M0.0%N/A0.005%Search for SEC Filing on Google Icon
8/12/2026Evolve Private Wealth LLC116$0.24M0.0%N/A0.005%Search for SEC Filing on Google Icon
8/11/2026Keating Financial Advisory Services Inc.21$44K0.0%N/A0.001%Search for SEC Filing on Google Icon
8/11/2026OneAscent Financial Services LLC253$0.53M0.0%N/A0.011%Search for SEC Filing on Google Icon
8/11/2026Allworth Financial LP45$93K0.0%N/A0.002%Search for SEC Filing on Google Icon
8/11/2026Vise Technologies Inc.101$0.21M0.0%N/A0.004%Search for SEC Filing on Google Icon
8/10/2026NewEdge Wealth LLC104$0.22M0.0%N/A0.004%Search for SEC Filing on Google Icon
8/10/2026Ackerman Asset Management LLC100$0.21M0.1%N/A0.004%Search for SEC Filing on Google Icon
8/10/2026Great Lakes Advisors LLC110$0.23M0.0%N/A0.005%Search for SEC Filing on Google Icon
8/10/2026Gables Capital Management Inc.15$31K0.0%N/A0.001%Search for SEC Filing on Google Icon
8/8/2026Equity Investment Corp99$0.21M0.0%N/A0.004%Search for SEC Filing on Google Icon
8/8/2026Meeder Asset Management Inc.217$0.45M0.0%N/A0.009%Search for SEC Filing on Google Icon
8/7/2026BlackRock Inc.117,871$244.39M0.0%N/A4.753%Search for SEC Filing on Google Icon
8/7/2026Deutsche Bank AG427$0.89M0.0%N/A0.017%Search for SEC Filing on Google Icon
8/7/2026Perigon Wealth Management LLC110$0.23M0.0%N/A0.004%Search for SEC Filing on Google Icon
8/6/2026Global Retirement Partners LLC85$0.18M0.0%N/A0.003%Search for SEC Filing on Google Icon
8/6/2026Bank of New York Mellon Corp8,412$17.44M0.0%N/A0.339%Search for SEC Filing on Google Icon
8/6/2026One Wealth Advisors LLC111$0.23M0.0%N/A0.004%Search for SEC Filing on Google Icon
7/9/2026Legacy Wealth Asset Management LLC329$0.68M0.1%+2.5%0.013%Search for SEC Filing on Google Icon
7/8/2026Reinhart Partners LLC.44,480$92.27M2.1%+19.0%1.794%Search for SEC Filing on Google Icon
7/7/2026GAMMA Investing LLC249$0.52M0.0%+23.3%0.010%Search for SEC Filing on Google Icon
7/2/2026Versant Capital Management Inc24$50K0.0%-51.0%0.001%Search for SEC Filing on Google Icon
6/3/2026NewEdge Advisors LLC191$0.42M0.0%-2.6%0.008%Search for SEC Filing on Google Icon
5/19/2026Bank of America Corp DE28,358$62.30M0.0%-1.6%1.143%Search for SEC Filing on Google Icon
5/19/2026Edgestream Partners L.P.3,130$6.88M0.2%+491.7%0.126%Search for SEC Filing on Google Icon
5/18/2026Amundi615$1.35M0.0%N/A0.025%Search for SEC Filing on Google Icon
5/18/2026California State Teachers Retirement System2,887$6.34M0.0%+17.5%0.116%Search for SEC Filing on Google Icon
5/18/2026Royal Bank of Canada1,195$2.63M0.0%+8.9%0.048%Search for SEC Filing on Google Icon
5/18/2026Empowered Funds LLC1,284$2.82M0.0%+1,342.7%0.052%Search for SEC Filing on Google Icon
5/16/2026The Manufacturers Life Insurance Company614$1.35M0.0%+10.6%0.025%Search for SEC Filing on Google Icon
5/16/2026Quantinno Capital Management LP9,784$21.50M0.0%+34.6%0.395%Search for SEC Filing on Google Icon
5/15/2026Weiss Asset Management LP120$0.26M0.0%N/A0.005%Search for SEC Filing on Google Icon
5/15/2026Bradley Foster & Sargent Inc. CT2,002$4.40M0.1%-63.3%0.081%Search for SEC Filing on Google Icon
5/15/2026London Co. of Virginia57,131$125.54M0.8%-2.7%2.304%Search for SEC Filing on Google Icon
5/15/2026Entropy Technologies LP470$1.03M0.0%-4.1%0.019%Search for SEC Filing on Google Icon
5/15/2026Cannell & Spears LLC28,027$61.57M1.2%-0.3%1.130%Search for SEC Filing on Google Icon
5/14/2026Renaissance Technologies LLC2,611$5.74M0.0%+74.0%0.105%Search for SEC Filing on Google Icon
5/14/2026Public Employees Retirement System of Ohio751$1.65M0.0%-3.2%0.030%Search for SEC Filing on Google Icon
5/14/2026Arrowstreet Capital Limited Partnership1,913$4.20M0.0%+135.9%0.077%Search for SEC Filing on Google Icon
5/14/2026Capula Management Ltd921$2.02M0.0%N/A0.037%Search for SEC Filing on Google Icon
5/14/2026Bank of Nova Scotia178$0.39M0.0%-5.8%0.007%Search for SEC Filing on Google Icon
5/14/2026Sei Investments Co.11,098$24.38M0.0%+40.2%0.448%Search for SEC Filing on Google Icon
5/14/2026State of Wyoming179$0.39M0.0%+33.6%0.007%Search for SEC Filing on Google Icon
5/13/2026Cetera Investment Advisers346$0.76M0.0%-4.9%0.014%Search for SEC Filing on Google Icon
5/13/2026NewEdge Wealth LLC105$0.23M0.0%-13.9%0.004%Search for SEC Filing on Google Icon
5/13/2026First Trust Advisors LP3,058$6.72M0.0%-32.9%0.123%Search for SEC Filing on Google Icon
5/8/2026Triad Investment Management2,513$5.52M6.1%-1.4%0.101%Search for SEC Filing on Google Icon
5/8/2026PNC Financial Services Group Inc.546$1.20M0.0%+1.9%0.022%Search for SEC Filing on Google Icon
5/7/2026WCM Investment Management LLC5,995$13.15M0.0%-43.9%0.242%Search for SEC Filing on Google Icon
5/7/2026Dimensional Fund Advisors LP156,618$344.08M0.1%+0.0%6.315%Search for SEC Filing on Google Icon
5/7/2026Swiss National Bank5,036$11.06M0.0%-1.0%0.203%Search for SEC Filing on Google Icon
5/6/2026California Public Employees Retirement System6,414$14.09M0.0%-4.5%0.259%Search for SEC Filing on Google Icon
5/6/2026Kera Capital Partners Inc.125$0.28M0.0%+9.6%0.005%Search for SEC Filing on Google Icon
5/6/2026Bessemer Group Inc.19$42K0.0%-26.9%0.001%Search for SEC Filing on Google Icon
5/6/2026Allspring Global Investments Holdings LLC18,612$40.55M0.1%-7.8%0.750%Search for SEC Filing on Google Icon
5/5/2026Regency Capital Management Inc. DE1,535$3.37M1.5%-6.1%0.062%Search for SEC Filing on Google Icon
5/5/2026Midwest Professional Planners LTD.395$0.87M0.2%+1.8%0.016%Search for SEC Filing on Google Icon
5/5/2026Bank of New York Mellon Corp8,444$18.55M0.0%-4.4%0.341%Search for SEC Filing on Google Icon
5/5/2026Sanctuary Advisors LLC418$0.92M0.0%-12.0%0.017%Search for SEC Filing on Google Icon
5/4/2026AMG National Trust Bank571$1.25M0.0%-4.0%0.023%Search for SEC Filing on Google Icon
5/4/2026Chicago Partners Investment Group LLC467$1.06M0.0%-10.7%0.019%Search for SEC Filing on Google Icon
5/2/2026Global Assets Advisory LLC15$33K0.0%N/A0.001%Search for SEC Filing on Google Icon
5/1/2026Sequoia Financial Advisors LLC824$1.81M0.0%-9.1%0.033%Search for SEC Filing on Google Icon
4/30/2026Equitable Trust Co.830$1.82M0.1%-1.2%0.033%Search for SEC Filing on Google Icon
4/30/2026Hsbc Holdings PLC94$0.21M0.0%N/A0.004%Search for SEC Filing on Google Icon
4/30/2026Kestra Advisory Services LLC122$0.27M0.0%-28.7%0.005%Search for SEC Filing on Google Icon
4/30/2026Quantum Portfolio Management LLC96$0.21M0.0%N/A0.004%Search for SEC Filing on Google Icon
4/28/2026Lee Danner & Bass Inc.3,203$7.04M0.4%+3.2%0.129%Search for SEC Filing on Google Icon
4/27/2026HB Wealth Management LLC151$0.33M0.0%+16.2%0.006%Search for SEC Filing on Google Icon
4/27/2026Elevation Point Wealth Partners LLC297$0.65M0.0%+33.2%0.012%Search for SEC Filing on Google Icon
4/25/2026Eagle Bay Advisors LLC104$0.23M0.2%+14.3%0.004%Search for SEC Filing on Google Icon
4/25/2026Keybank National Association OH161$0.35M0.0%-8.5%0.006%Search for SEC Filing on Google Icon
4/22/2026Janney Montgomery Scott LLC510$1.12M0.0%+5.8%0.021%Search for SEC Filing on Google Icon
4/22/2026Pictet Asset Management Holding SA430$0.95M0.0%+7.5%0.017%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: $2,137.69
Low: $2,100.08
High: $2,141.50

50 Day Range

MA: $2,123.50
Low: $2,001.45
High: $2,213.60

52 Week Range

Now: $2,137.69
Low: $1,648.00
High: $2,333.00

Volume

2,144 shs

Average Volume

19,157 shs

Market Capitalization

$5.10 billion

P/E Ratio

4.86

Dividend Yield

0.05%

Beta

0.29

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 (Director)
  2. Mountains Insurance Grou White (Major Shareholder)
  3. Raymond Joseph Rene Barrette (Chairman)
  4. Morgan W Davis (Director)
  5. Robert Lawrence Seelig (EVP)
  6. Yves Brouillette (Director)
  7. George Manning Rountree (Director)
  8. Kernan V Oberting (Director)
  9. Lowndes Andrew Smith (Director)
  10. Weston M Hicks (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. BlackRock Inc. — 4.75%
  2. Wallace Capital Management Inc. — 3.35%
  3. Reinhart Partners LLC. — 1.79%
  4. Bank of America Corp DE — 1.05%
  5. Wellington Management Group LLP — 0.61%
  6. Boussard & Gavaudan Gestion Sas — 0.49%
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. UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC
  2. Wellington Management Group LLP
  3. Athena Investment Management
  4. Versant Capital Management Inc
  5. Private Management Group Inc.
  6. Syon Capital LLC

Which major investors are buying White Mountains Insurance Group stock?

During the last quarter, WTM stock was purchased by institutional investors including:
  1. BlackRock Inc.
  2. Wallace Capital Management Inc.
  3. Bank of America Corp DE
  4. Boussard & Gavaudan Gestion Sas
  5. Bank of New York Mellon Corp
  6. Reinhart Partners LLC.
  7. Winmill & CO. Inc.
  8. Legal & General Group Plc

White Mountains Insurance Group Active Insiders

Michaela Hildreth
Michaela Hildreth (Age 57)
CAO
Morgan W Davis
Director
Peter M Carlson
Director
Weston M Hicks
Weston M Hicks
Director
Philip A Gelston
Philip A Gelston
Director