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, Q2 2026
Institutional positions in White Mountains Insurance Group Ltd as of Jun 30, 2026. 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
- 356
- −7 vs. Q1 2026
- Shares held
- 2.20M
- +8.83K (+0.4%) vs. Q1 2026
- Total value
- $4.57B
- −$252.8M (−5.2%) vs. Q1 2026
- New holders
- 39
- 96 more added
- Sold out
- 46
- 146 more reduced
5 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2026: 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, Q2 2026
Shares, value and share of portfolio for each institution holding White Mountains Insurance Group Ltd; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BNP Paribas Arbitrage, SA | 1,169 | $2.42M | 0.00% | −5,454−82.3% | Reduced |
| Midwest Professional Planners, LTD. | 1,164 | $2.41M | 0.47% | +769+194.7% | Added |
| Pecaut & Co. | 1,142 | $2.37M | 0.72% | −30−2.6% | Reduced |
| Walleye Capital LLC | 1,130 | $2.34M | 0.01% | +1,130 | New |
| Jupiter Topco LLC | 1,123 | $2.32M | 0.00% | +1,123 | New |
| Police & Firemen's Retirement System of New Jersey | 1,112 | $2.31M | 0.02% | +30+2.8% | Added |
| Leuthold Group, LLC | 1,104 | $2.29M | 0.23% | +52+4.9% | Added |
| Autumn Glory Partners, LLC | 1,080 | $2.24M | 0.63% | 00.0% | Unchanged |
| Harbor Capital Advisors, Inc. | 1,079 | $2.24M | 0.15% | +41+3.9% | Added |
| Mercer Global Advisors Inc | 1,055 | $2.19M | 0.00% | +189+21.8% | Added |
| Treasurer of the State of North Carolina | 1,026 | $2.13M | 0.01% | −30−2.8% | Reduced |
| Alliancebernstein L.P. | 944 | $2.07M | 0.00% | −9−0.9% | Reduced |
| Vanguard Global Advisers, LLC | 940 | $1.95M | 0.00% | −62−6.2% | Reduced |
| Captrust Financial Advisors | 927 | $1.92M | 0.00% | −308−24.9% | Reduced |
| Brave Asset Management Inc | 924 | $1.92M | 0.41% | 00.0% | Unchanged |
| State of New Jersey Common Pension Fund D | 914 | $1.90M | 0.01% | −221−19.5% | Reduced |
| Squarepoint Ops LLC | 905 | $1.88M | 0.00% | +905 | New |
| Handelsbanken Fonder AB | 880 | $1.82M | 0.01% | 00.0% | Unchanged |
| Ethic Inc. | 860 | $1.78M | 0.02% | +60+7.5% | Added |
| Quadrature Capital Ltd | 859 | $1.78M | 0.02% | −354−29.2% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 851 | $1.76M | 0.00% | −62−6.8% | Reduced |
| Allianz Asset Management GmbH | 844 | $1.75M | 0.00% | +844 | New |
| O'Shaughnessy Asset Management, LLC | 841 | $1.74M | 0.01% | −169−16.7% | Reduced |
| Summit Trail Advisors, LLC | 817 | $1.69M | 0.02% | +57+7.5% | Added |
| Sequoia Financial Advisors, LLC | 810 | $1.68M | 0.01% | −14−1.7% | Reduced |
| Private Management Group Inc | 806 | $1.67M | 0.04% | −17−2.1% | Reduced |
| FMR LLC | 786 | $1.63M | 0.00% | −119−13.1% | Reduced |
| Teachers Retirement System of the State of Kentucky | 767 | $1.59M | 0.01% | 00.0% | Unchanged |
| Nisa Investment Advisors, LLC | 754 | $1.56M | 0.00% | +16+2.2% | Added |
| Farther Finance Advisors, LLC | 723 | $1.50M | 0.01% | +67+10.2% | Added |
| Public Employees Retirement System of Ohio | 721 | $1.49M | 0.00% | −30−4.0% | Reduced |
| Truist Financial Corp | 716 | $1.48M | 0.00% | +32+4.7% | Added |
| Brandes Investment Partners, LP | 701 | $1.45M | 0.01% | +3+0.4% | Added |
| Texas Yale Capital Corp. | 687 | $1.42M | 0.03% | 00.0% | Unchanged |
| Park Avenue Securities LLC | 674 | $1.40M | 0.01% | −29−4.1% | Reduced |
| Arizona State Retirement System | 664 | $1.38M | 0.01% | −35−5.0% | Reduced |
| Advisor Group Holdings, Inc. | 652 | $1.35M | 0.00% | +2+0.3% | Added |
| Voya Investment Management LLC | 645 | $1.34M | 0.00% | +408+172.2% | Added |
| Vident Advisory, LLC | 635 | $1.32M | 0.01% | +635 | New |
| Vanguard Investments Australia, Ltd. | 622 | $1.29M | 0.00% | −1−0.2% | Reduced |
| Nelson, Van Denburg & Campbell Wealth Management Group, LLC | 619 | $1.28M | 0.03% | +2+0.3% | Added |
| Manufacturers Life Insurance Company, The | 617 | $1.28M | 0.00% | +3+0.5% | Added |
| CI Private Wealth, LLC | 611 | $1.27M | 0.00% | −787−56.3% | Reduced |
| Worldquant Millennium Advisors LLC | 591 | $1.23M | 0.00% | +591 | New |
| Barclays PLC | 583 | $1.21M | 0.00% | +48+9.0% | Added |
| KLP Kapitalforvaltning AS | 565 | $1.17M | 0.00% | 00.0% | Unchanged |
| Wiley Bros.-Aintree Capital, LLC | 551 | $1.14M | 0.00% | −47−7.9% | Reduced |
| Chicago Partners Investment Group LLC | 523 | $1.14M | 0.02% | +56+12.0% | Added |
| B.O.S.S. Retirement Advisors, LLC | 533 | $1.11M | 0.30% | 00.0% | Unchanged |
| Lexington Hill Partners, LLC | 520 | $1.08M | 0.52% | 00.0% | Unchanged |
| Regions Financial Corp | 517 | $1.07M | 0.01% | 00.0% | Unchanged |
| TD Asset Management Inc | 512 | $1.06M | 0.00% | −420−45.1% | Reduced |
| Mirabella Financial Services LLP | 495 | $1.03M | 0.10% | +495 | New |
| Citigroup Inc | 483 | $1.00M | 0.00% | −917−65.5% | Reduced |
| The PNC Financial Services Group, Inc. | 482 | $999.4K | 0.00% | −64−11.7% | Reduced |
| Bank of Montreal | 481 | $997.3K | 0.00% | +48+11.1% | Added |
| Sendero Wealth Management, LLC | 481 | $997.3K | 0.10% | −81−14.4% | Reduced |
| Janney Montgomery Scott LLC | 476 | $987.0K | 0.00% | −34−6.7% | Reduced |
| Parker Investment Management, LLC | 475 | $984.9K | 0.12% | 00.0% | Unchanged |
| Jain Global LLC | 467 | $968.3K | 0.01% | +71+17.9% | Added |
| Pathstone Holdings, LLC | 458 | $949.6K | 0.00% | −2−0.4% | Reduced |
| Legacy Advisors, LLC | 448 | $928.9K | 0.09% | −2−0.4% | Reduced |
| SRS Capital Advisors, Inc. | 447 | $928.8K | 0.01% | +172+62.5% | Added |
| Rockefeller Capital Management L.P. | 433 | $898.0K | 0.00% | +173+66.5% | Added |
| Allstate Corp | 433 | $897.8K | 0.01% | −148−25.5% | Reduced |
| Deutsche Bank AG | 427 | $885.3K | 0.00% | +172+67.5% | Added |
| Amundi | 425 | $881.2K | 0.00% | −190−30.9% | Reduced |
| Savant Capital, LLC | 387 | $826.3K | 0.00% | +188+94.5% | Added |
| Resona Asset Management Co.,Ltd. | 394 | $816.9K | 0.00% | −49−11.1% | Reduced |
| Teacher Retirement System of Texas | 389 | $806.5K | 0.00% | +220+130.2% | Added |
| Sanctuary Advisors, LLC | 387 | $802.6K | 0.00% | −31−7.4% | Reduced |
| MPS Loria Financial Planners, LLC | 383 | $794.1K | 0.18% | +383 | New |
| Pictet Asset Management Holding SA | 380 | $787.9K | 0.00% | −50−11.6% | Reduced |
| Klingenstein Fields & Co LP | 380 | $787.9K | 0.03% | 00.0% | Unchanged |
| Storgate, LLC | 370 | $767.2K | 0.16% | +246+198.4% | Added |
| Cetera Investment Advisers | 363 | $753.0K | 0.00% | +17+4.9% | Added |
| Aquatic Capital Management LLC | 361 | $748.5K | 0.03% | −551−60.4% | Reduced |
| Roundview Capital LLC | 358 | $742.4K | 0.04% | 00.0% | Unchanged |
| US Bancorp | 354 | $734.0K | 0.00% | +217+158.4% | Added |
| Atria Investments LLC | 349 | $723.9K | 0.01% | +123+54.4% | Added |
| Bryant Woods Investment Advisors, LLC | 340 | $705.0K | 0.20% | 00.0% | Unchanged |
| Glenmede Trust Co NA | 340 | $705.0K | 0.00% | −14−4.0% | Reduced |
| American Capital Advisory, LLC | 338 | $700.8K | 0.26% | −4−1.2% | Reduced |
| Lummis Asset Management, LP | 325 | $688.5K | 0.41% | 00.0% | Unchanged |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 332 | $688.4K | 0.00% | −73−18.0% | Reduced |
| Legacy Wealth Asset Management, LLC | 329 | $682.1K | 0.15% | +8+2.5% | Added |
| State of Wisconsin Investment Board | 323 | $669.7K | 0.00% | +77+31.3% | Added |
| Wealth Enhancement Advisory Services, LLC | 289 | $630.4K | 0.00% | +113+64.2% | Added |
| Brown Miller Wealth Management, LLC | 298 | $618.8K | 0.16% | 00.0% | Unchanged |
| Mount Yale Investment Advisors, LLC | 294 | $609.6K | 0.01% | −3−1.0% | Reduced |
| RSM US Wealth Management LLC | 294 | $609.6K | 0.01% | −52−15.0% | Reduced |
| BTG Pactual Asset Management US LLC | 289 | $599.2K | 0.04% | +289 | New |
| Commonwealth Equity Services, LLC | 281 | $582.9K | 0.00% | +7+2.6% | Added |
| Essex Savings Bank | 275 | $570.2K | 0.12% | 00.0% | Unchanged |
| SG Americas Securities, LLC | 266 | $552.0K | 0.00% | +65+32.3% | Added |
| Public Employees Retirement Association of Colorado | 263 | $545.0K | 0.00% | −90−25.5% | Reduced |
| JustInvest LLC | 257 | $532.9K | 0.00% | −57−18.2% | Reduced |
| Vestcor Inc | 255 | $529.0K | 0.01% | 00.0% | Unchanged |
| OneAscent Financial Services LLC | 253 | $524.6K | 0.03% | +25+11.0% | Added |
| GAMMA Investing LLC | 249 | $516.3K | 0.02% | +47+23.3% | Added |