White Mountains Insurance Group Ownership | Who Owns White Mountains Insurance Group?
White Mountains Insurance Group Ownership Summary
White Mountains Insurance Group is owned by 86.56% institutional investors, 3.23% insiders, and 10.21% retail investors. Vanguard group is the largest institutional shareholder, holding 9.27% of WTM shares. FullerThaler Behavioral Small-Cap Value is the top mutual fund, with 3.69% of its assets in White Mountains Insurance Group shares.
WTM Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | White Mountains Insurance Group | 86.56% | 3.23% | 10.21% |
| Sector | Financial Services Stocks | 736.16% | 13.84% | -650.00% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Vanguard group | 235.70K | 9.27% | $489.79M |
| Dimensional fund advisors lp | 158.95K | 6.22% | $329.58M |
| Neuberger berman group | 119.14K | 4.66% | $247.03M |
| Blackrock funding, inc. /de | 117.87K | 4.61% | $244.39M |
| Blackrock | 116.45K | 4.60% | $211.65M |
| River road asset management | 115.88K | 4.54% | $240.26M |
| Vanguard capital management | 107.48K | 4.21% | $222.85M |
| Fuller & thaler asset management | 101.89K | 3.99% | $211.26M |
| Cooke & bieler lp | 85.12K | 3.33% | $176.49M |
| Wallace capital management | 80.07K | 3.13% | $166.01M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Elkhorn partners limited partnership | 12.32K | 21.89% | $25.54M |
| Wallace capital management | 80.07K | 18.20% | $166.01M |
| Mraz, amerine & associates | 22.22K | 6.61% | $46.07M |
| Triad investment management | 2.47K | 5.65% | $5.12M |
| Speece thorson capital group | 9.21K | 4.08% | $19.11M |
| Boussard & gavaudan investment management llp | 13.97K | 2.92% | $30.97M |
| River road asset management | 115.88K | 2.67% | $240.26M |
| Cove street capital | 1.08K | 2.36% | $1.81M |
| Winmill | 4.80K | 2.20% | $9.95M |
| Reinhart partners | 44.48K | 2.11% | $92.27M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Norges bank | 27.96K | 0.01% | 27.96K |
| Sixth street partners management company | 23.50K | 0.01% | 23.50K |
| American century companies | 31.11K | 0.03% | 22.80K |
| Gendell jeffrey l | 59.24K | 1.08% | 21.43K |
| Boussard & gavaudan investment management llp | 13.97K | 2.92% | 13.97K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Proficio capital partners | - | - | -23.34K |
| Cooke & bieler lp | 85.12K | 2.04% | -19.74K |
| Fiduciary management inc /wi/ | 66.55K | 1.96% | -18.52K |
| Morgan stanley | 46.87K | 0.01% | -12.43K |
| Vanguard group | 235.70K | 0.01% | -11.31K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Norges bank | 27.96K | 0.01% | 27.96K | $57.96M |
| Sixth street partners management company | 23.50K | 0.01% | 23.50K | $48.74M |
| Boussard & gavaudan investment management llp | 13.97K | 2.92% | 13.97K | $30.97M |
| Winmill | 4.80K | 2.20% | 4.80K | $9.95M |
| Lighthouse investment partners | 1.87K | 0.11% | 1.87K | $3.87M |
Sold Out
| Holder | Change |
|---|---|
| First horizon | -1.00 |
| Stephens consulting | -1.00 |
| Bruce g. allen investments | -1.00 |
| Ifp advisors | -1.00 |
| English capital management | -1.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Jun 30, 2026 | 354 | -3.80% | 2,210,967 | 0.06% | 86 | 1.16% | 133 | -21.30% | 145 | 30.63% |
| Mar 31, 2026 | 209 | -40.63% | 943,388 | -58.05% | 36 | 0.47% | 84 | -46.84% | 60 | -52.38% |
| Dec 31, 2025 | 256 | -23.81% | 1,650,484 | -29.11% | 64 | 0.77% | 113 | -26.62% | 88 | -10.20% |
| Sep 30, 2025 | 236 | -25.32% | 1,512,408 | -29.13% | 59 | 0.84% | 101 | -25.74% | 70 | -33.96% |
| Jun 30, 2025 | 323 | 0.94% | 2,322,105 | 1.97% | 91 | 1.14% | 138 | 6.98% | 110 | 2.80% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| FullerThaler Behavioral Small-Cap Value | 88.04K | 3.69% | -3.20K |
| FullerThaler Beh Small-Cap Value SMA | 88.04K | 3.55% | 85.99K |
| Undiscovered Managers Behavioral Val L | 82.27K | 3.32% | -3.20K |
| Vanguard Total Stock Mkt Idx Inv | 74.67K | 3.01% | -2.46K |
| Vanguard Morn Total Stk Mkt Idx Investor | 74.67K | 3.01% | -2.46K |
| Vanguard US Total Market Shares ETF | 77.46K | 3.01% | 88.00 |
| Neuberger Genesis Inv | 68.18K | 2.75% | -3.07K |
| Vanguard Small Cap Index | 53.95K | 2.18% | -1.84K |
| Neuberger Berman Genesis Inv | 49.75K | 1.93% | 13.94K |
| FMI Common Stock Investor | 40.00K | 1.62% | -5.00K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Dec 19, 2025 | CAMPBELL REID TARLTON | - | Sell | $10.25M |
| Dec 19, 2025 | CAMPBELL REID TARLTON | - | Sell | - |
| Dec 19, 2025 | Rountree George Manning | Chief Executive Officer | Sell | $10.25M |
| Dec 16, 2025 | Gelston Philip A | - | Sell | $338.00K |
| Nov 17, 2023 | Hicks Weston M | - | Buy | $856.85K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q2 | - | - |
| 2026 Q1 | - | - |
| 2025 Q4 | - | 4 |
| 2025 Q2 | - | - |
| 2025 Q1 | - | - |
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