White Mountains Insurance Group Ltd
WTM- Exchange
- NYSE
- Industry
- Fire, Marine & Casualty Insurance
- SEC CIK
- 0000776867
No open-market purchases or sales by White Mountains Insurance Group Ltd insiders were filed in the last 90 days; 356 institutions reported holding it in 13F filings for Q2 2026, worth $4.57B in total; Southeastern Asset Management (Longleaf) is the only superinvestor holding it.
13F holders, Q1 2022
Institutional positions in White Mountains Insurance Group Ltd as of Mar 31, 2022. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 244
- +4 vs. Q4 2021
- Shares held
- 2.69M
- +16.8K (+0.6%) vs. Q4 2021
- Total value
- $3.09B
- +$373.0M (+13.7%) vs. Q4 2021
- New holders
- 26
- 63 more added
- Sold out
- 22
- 94 more reduced
3 institutions that held it in Q4 2021 haven't filed for Q1 2022 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2021: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting WTM on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 356 | $4.57B |
| Q1 2026 | 368 | $4.86B |
| Q4 2025 | 353 | $4.67B |
| Q3 2025 | 338 | $3.89B |
| Q2 2025 | 325 | $4.17B |
| Q1 2025 | 322 | $4.44B |
| Q4 2024 | 325 | $4.43B |
| Q3 2024 | 304 | $3.78B |
| Q2 2024 | 306 | $4.14B |
| Q1 2024 | 303 | $4.06B |
| Q4 2023 | 295 | $3.42B |
| Q3 2023 | 272 | $3.40B |
| Q2 2023 | 258 | $3.13B |
| Q1 2023 | 262 | $3.09B |
| Q4 2022 | 265 | $3.20B |
| Q3 2022 | 251 | $2.98B |
| Q2 2022 | 259 | $3.32B |
| Q1 2022 | 244 | $3.09B |
| Q4 2021 | 243 | $2.71B |
| Q3 2021 | 232 | $2.86B |
| Q2 2021 | 233 | $3.11B |
| Q1 2021 | 245 | $3.02B |
Institutions, Q1 2022
Shares, value and share of portfolio for each institution holding White Mountains Insurance Group Ltd; share changes are against Q4 2021.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Martingale Asset Management L P | 7,350 | $8.35M | 0.13% | −554−7.0% | Reduced |
| Hotchkis & Wiley Capital Management LLC | 7,500 | $8.52M | 0.03% | +660+9.6% | Added |
| Eagle Asset Management Inc | 7,684 | $8.73M | 0.04% | −326−4.1% | Reduced |
| New York State Common Retirement Fund | 8,076 | $9.18M | 0.01% | +1,687+26.4% | Added |
| Millennium Management LLC | 8,740 | $9.93M | 0.01% | +7,328+519.0% | Added |
| Madison Avenue Partners, LP | 10,000 | $11.4M | 2.12% | +10,000 | New |
| Robeco Institutional Asset Management B.V. | 10,353 | $11.8M | 0.03% | −1,726−14.3% | Reduced |
| Nuveen Asset Management, LLC | 11,658 | $12.3M | 0.00% | −2,247−16.2% | Reduced |
| Parametric Portfolio Associates LLC | 12,513 | $14.2M | 0.01% | +405+3.3% | Added |
| Royce & Associates LP | 12,516 | $14.2M | 0.12% | −530−4.1% | Reduced |
| Bank of New York Mellon Corp | 12,624 | $14.3M | 0.00% | −101−0.8% | Reduced |
| First Trust Advisors LP | 13,608 | $15.5M | 0.02% | −13,496−49.8% | Reduced |
| Federated Hermes, Inc. | 15,139 | $17.2M | 0.04% | −7,328−32.6% | Reduced |
| Northern Trust Corp | 15,560 | $17.7M | 0.00% | −5,856−27.3% | Reduced |
| Wells Fargo & Company | 15,758 | $17.9M | 0.00% | +338+2.2% | Added |
| Speece Thorson Capital Group Inc | 16,531 | $18.8M | 4.02% | −1,411−7.9% | Reduced |
| Cove Street Capital, LLC | 19,154 | $21.8M | 3.85% | +2,949+18.2% | Added |
| Elkhorn Partners Limited Partnership | 22,020 | $25.0M | 13.44% | −80−0.4% | Reduced |
| Mraz, Amerine & Associates, Inc. | 22,773 | $25.9M | 6.15% | +139+0.6% | Added |
| Charles Schwab Investment Management Inc | 26,685 | $30.3M | 0.01% | +1,343+5.3% | Added |
| Pendal Group Limited | 27,646 | $31.4M | 0.26% | −775−2.7% | Reduced |
| Norges Bank | 28,042 | $31.9M | 0.01% | +1,180+4.4% | Added |
| Thompson Siegel & Walmsley LLC | 29,028 | $33.0M | 0.47% | −195−0.7% | Reduced |
| Cannell Peter B & Co Inc | 33,380 | $37.9M | 1.14% | −679−2.0% | Reduced |
| Raymond James & Associates | 33,737 | $38.3M | 0.03% | −846−2.4% | Reduced |
| Fiduciary Management Inc | 35,892 | $40.8M | 0.33% | +460+1.3% | Added |
| Geode Capital Management, LLC | 38,365 | $43.6M | 0.01% | +1,512+4.1% | Added |
| Scout Investments, Inc. | 41,063 | $46.7M | 0.75% | −11,508−21.9% | Reduced |
| Select Equity Group, L.P. | 41,207 | $46.8M | 0.15% | +41,207 | New |
| Bank of America Corp | 52,500 | $59.7M | 0.01% | −6,467−11.0% | Reduced |
| State Street Corp | 55,824 | $63.4M | 0.00% | +2,365+4.4% | Added |
| Reinhart Partners, Inc. | 14,880 | $64.3M | 3.11% | −39,682−72.7% | Reduced |
| Wallace Capital Management Inc. | 71,871 | $75.5M | 11.37% | +531+0.7% | Added |
| London Co of Virginia | 69,779 | $79.3M | 0.42% | −2,846−3.9% | Reduced |
| Artisan Partners Limited Partnership | 118,761 | $134.9M | 0.18% | +25,270+27.0% | Added |
| BlackRock Inc. | 119,354 | $135.6M | 0.00% | −344−0.3% | Reduced |
| Southeastern Asset Management IncSuperinvestorSoutheastern Asset Management (Longleaf) | 125,503 | $142.6M | 2.52% | +73,901+143.2% | Added |
| Boston Partners | 135,408 | $153.7M | 0.19% | −2,428−1.8% | Reduced |
| Fuller & Thaler Asset Management, Inc. | 139,917 | $159.0M | 0.94% | +6,210+4.6% | Added |
| Atlanta Capital Management Co L L C | 150,742 | $171.3M | 0.63% | −22,536−13.0% | Reduced |
| River Road Asset Management, LLC | 151,292 | $171.9M | 1.90% | −15,437−9.3% | Reduced |
| Dimensional Fund Advisors LP | 154,553 | $175.6M | 0.05% | +5,051+3.4% | Added |
| Wellington Management Group LLP | 213,022 | $242.0M | 0.04% | −8,537−3.9% | Reduced |
| Vanguard Group Inc | 280,559 | $318.8M | 0.01% | +1,197+0.4% | Added |
| State of Alaska, Department of Revenue | 0 | $0 | 0.00% | −2,297−100.0% | Sold out |
| Allianz Asset Management GmbH | 0 | $0 | 0.00% | −2,257−100.0% | Sold out |
| LMR Partners LLP | 0 | $0 | 0.00% | −1,230−100.0% | Sold out |
| Squarepoint Ops LLC | 0 | $0 | 0.00% | −780−100.0% | Sold out |
| Virtu Financial LLC | 0 | $0 | 0.00% | −670−100.0% | Sold out |
| Alpine Global Management, LLC | 0 | $0 | 0.00% | −648−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −615−100.0% | Sold out |
| Fragasso Group Inc. | 0 | $0 | 0.00% | −505−100.0% | Sold out |
| Oak Thistle LLC | 0 | $0 | 0.00% | −393−100.0% | Sold out |
| Agf Investments Inc. | 0 | $0 | 0.00% | −374−100.0% | Sold out |
| Personal Capital Advisors Corp | 0 | $0 | 0.00% | −249−100.0% | Sold out |
| Prelude Capital Management, LLC | 0 | $0 | 0.00% | −225−100.0% | Sold out |
| Marshall Wace, LLP | 0 | $0 | 0.00% | −156−100.0% | Sold out |
| Outfitter Financial LLC | 0 | $0 | 0.00% | −150−100.0% | Sold out |
| Metropolitan Life Insurance Co | 0 | $0 | 0.00% | −59−100.0% | Sold out |
| Sageworth Trust Co | 0 | $0 | 0.00% | −41−100.0% | Sold out |
| Lazard Asset Management LLC | 0 | $0 | 0.00% | −38−100.0% | Sold out |
| First Horizon Advisors, Inc. | 0 | $0 | 0.00% | −25−100.0% | Sold out |
| GPS Wealth Strategies Group, LLC | 0 | $0 | 0.00% | −10−100.0% | Sold out |
| Dark Forest Capital Management LP | 0 | $0 | 0.00% | −5−100.0% | Sold out |
| Patriot Financial Group Insurance Agency, LLC | 0 | $0 | 0.00% | −3−100.0% | Sold out |
| Spire Wealth Management | 0 | $0 | 0.00% | −3−100.0% | Sold out |
| Markston International LLC | – | – | – | – | Not filed |
| NEXT Financial Group, Inc | – | – | – | – | Not filed |
| Bell Investment Advisors, Inc | – | – | – | – | Not filed |