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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, Q3 2025

Institutional positions in White Mountains Insurance Group Ltd as of Sep 30, 2025. 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
338
+17 vs. Q2 2025
Shares held
2.33M
+39.1K (+1.7%) vs. Q2 2025
Total value
$3.89B
−$216.4M (−5.3%) vs. Q2 2025
New holders
44
105 more added
Sold out
27
103 more reduced

4 institutions that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q2 2025: 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.

Institutional holdersQ3 2025: 338 institutions
Q1 2021: 245 institutionsQ2 2021: 233 institutionsQ3 2021: 232 institutionsQ4 2021: 243 institutionsQ1 2022: 244 institutionsQ2 2022: 259 institutionsQ3 2022: 251 institutionsQ4 2022: 265 institutionsQ1 2023: 262 institutionsQ2 2023: 258 institutionsQ3 2023: 272 institutionsQ4 2023: 295 institutionsQ1 2024: 303 institutionsQ2 2024: 306 institutionsQ3 2024: 304 institutionsQ4 2024: 325 institutionsQ1 2025: 322 institutionsQ2 2025: 325 institutionsQ3 2025: 338 institutionsQ4 2025: 353 institutionsQ1 2026: 368 institutionsQ2 2026: 356 institutions
Value heldQ3 2025: $3.89B
Q1 2021: $3.02BQ2 2021: $3.11BQ3 2021: $2.86BQ4 2021: $2.71BQ1 2022: $3.09BQ2 2022: $3.32BQ3 2022: $2.98BQ4 2022: $3.20BQ1 2023: $3.09BQ2 2023: $3.13BQ3 2023: $3.40BQ4 2023: $3.42BQ1 2024: $4.06BQ2 2024: $4.14BQ3 2024: $3.78BQ4 2024: $4.43BQ1 2025: $4.44BQ2 2025: $4.17BQ3 2025: $3.89BQ4 2025: $4.67BQ1 2026: $4.86BQ2 2026: $4.57B
Institutions holding WTM and their total value by quarter
QuarterHoldersValue
Q2 2026356$4.57B
Q1 2026368$4.86B
Q4 2025353$4.67B
Q3 2025338$3.89B
Q2 2025325$4.17B
Q1 2025322$4.44B
Q4 2024325$4.43B
Q3 2024304$3.78B
Q2 2024306$4.14B
Q1 2024303$4.06B
Q4 2023295$3.42B
Q3 2023272$3.40B
Q2 2023258$3.13B
Q1 2023262$3.09B
Q4 2022265$3.20B
Q3 2022251$2.98B
Q2 2022259$3.32B
Q1 2022244$3.09B
Q4 2021243$2.71B
Q3 2021232$2.86B
Q2 2021233$3.11B
Q1 2021245$3.02B

Institutions, Q3 2025

Shares, value and share of portfolio for each institution holding White Mountains Insurance Group Ltd; share changes are against Q2 2025.

Institutions holding WTM in Q3 2025
InstitutionSharesValue% of portfolioChange in sharesAction
Cloud Capital Management, LLC1$1.00K0.00%+1New
Tortoise Investment Management, LLC1$1.67K0.00%00.0%Unchanged
MV Capital Management, Inc.1$1.67K0.00%00.0%Unchanged
SBI Securities Co., Ltd.1$1.67K0.00%00.0%Unchanged
Bruce G. Allen Investments, LLC1$1.67K0.00%00.0%Unchanged
Financial Network Wealth Advisors LLC1$1.67K0.00%00.0%Unchanged
Rothschild Investment LLC1$1.67K0.00%+1New
Atlantic Trust, LLC1$1.67K0.00%+1New
Private Wealth Management Group, LLC2$3.34K0.00%00.0%Unchanged
Kilter Group LLC2$3.34K0.00%00.0%Unchanged
TD Capital Management LLC2$3.35K0.00%00.0%Unchanged
Spire Wealth Management3$5.01K0.00%−2−40.0%Reduced
South State Corp.3$5.01K0.00%00.0%Unchanged
Trust Co of Vermont3$5.01K0.00%00.0%Unchanged
CoreFirst Bank & Trust4$6.69K0.00%00.0%Unchanged
Assetmark, Inc4$6.69K0.00%+3+300.0%Added
Premier Fund Managers Ltd5$8.00K0.00%−216−97.7%Reduced
JFS Wealth Advisors, LLC5$8.36K0.00%00.0%Unchanged
1620 Investment Advisors, Inc.6$10.0K0.01%00.0%Unchanged
Proffitt & Goodson Inc6$10.0K0.00%+6New
NBC Securities, Inc.7$11.7K0.00%00.0%Unchanged
UBS Asset Management Americas Inc7$11.7K0.00%−12,269−99.9%Reduced
Private Wealth Asset Management, LLC7$11.7K0.00%00.0%Unchanged
Binnacle Investments Inc7$11.7K0.01%00.0%Unchanged
Smartleaf Asset Management LLC7$11.7K0.00%00.0%Unchanged
Bartlett & Co. Wealth Management LLC8$13.4K0.00%00.0%Unchanged
Root Financial Partners, LLC8$13.4K0.00%+8New
Bell Investment Advisors, Inc8$13.4K0.00%00.0%Unchanged
Mitsubishi UFJ Kokusai Asset Management Co., Ltd.9$15.0K0.00%00.0%Unchanged
Bayforest Capital Ltd9$15.0K0.01%+5+125.0%Added
SJS Investment Consulting Inc.9$15.0K0.00%+9New
Wealthspire Advisors, LLC9$15.0K0.00%+9New
Northwestern Mutual Wealth Management Co11$18.4K0.00%−1−8.3%Reduced
Jones Financial Companies LLLP11$18.9K0.00%−8−42.1%Reduced
Capital Advisors, Ltd. LLC12$20.0K0.00%00.0%Unchanged
Nomura Asset Management Co Ltd12$20.1K0.00%00.0%Unchanged
Hemington Wealth Management14$23.0K0.00%+8+133.3%Added
Caitong International Asset Management Co., Ltd14$23.4K0.02%+14New
CWM, LLC15$25.0K0.00%−16−51.6%Reduced
Gables Capital Management Inc.15$25.1K0.01%00.0%Unchanged
Private Trust Co NA15$25.1K0.00%+1+7.1%Added
Versant Capital Management, Inc16$26.7K0.00%−17−51.5%Reduced
Huntington National Bank16$26.7K0.00%00.0%Unchanged
Fifth Third Bancorp17$28.4K0.00%00.0%Unchanged
TD Private Client Wealth LLC18$30.1K0.00%−14−43.8%Reduced
Delta Asset Management LLC19$31.8K0.00%00.0%Unchanged
Ameriflex Group, Inc.20$33.4K0.01%+20New
Fortitude Family Office, LLC21$35.1K0.01%00.0%Unchanged
CIBC Private Wealth Group, LLC25$41.8K0.00%00.0%Unchanged
Covestor Ltd28$48.0K0.03%+22+366.7%Added
Stephenson National Bank & Trust29$48.5K0.01%+3+11.5%Added
EverSource Wealth Advisors, LLC30$50.1K0.00%−13−30.2%Reduced
Quarry LP31$51.8K0.01%+31New
Clearstead Advisors, LLC31$51.8K0.00%−23−42.6%Reduced
WPG Advisers, LLC32$53.5K0.04%00.0%Unchanged
Allworth Financial LP35$58.5K0.00%+7+25.0%Added
Valley National Advisers Inc40$66.0K0.01%00.0%Unchanged
MetLife Investment Management42$70.2K0.00%00.0%Unchanged
Parallel Advisors, LLC45$75.2K0.00%−1−2.2%Reduced
Advisory Services Network, LLC45$75.2K0.00%+45New
Steward Partners Investment Advisory, LLC47$78.6K0.00%−58−55.2%Reduced
Anchor Investment Management, LLC50$83.6K0.01%00.0%Unchanged
Federation des caisses Desjardins du Quebec50$83.6K0.00%00.0%Unchanged
Signaturefd, LLC53$88.6K0.00%+1+1.9%Added
STRS Ohio60$100.3K0.00%−1,515−96.2%Reduced
Quent Capital, LLC60$100.3K0.01%+60New
Colonial Trust Co61$102.0K0.01%00.0%Unchanged
MAI Capital Management62$103.6K0.00%−1−1.6%Reduced
Smithfield Trust Co64$107.0K0.00%00.0%Unchanged
Parkside Financial Bank & Trust68$113.7K0.01%−3−4.2%Reduced
KBC Group NV72$120.0K0.00%00.0%Unchanged
State of Wyoming76$127.0K0.01%00.0%Unchanged
LRI Investments, LLC82$137.4K0.01%−8−8.9%Reduced
Bessemer Group Inc94$157.0K0.00%00.0%Unchanged
Citadel Investment Advisory, Inc.100$167.0K0.08%00.0%Unchanged
Eastern Bank100$167.2K0.00%00.0%Unchanged
Macquarie Group Ltd107$178.9K0.00%+107New
Ronald Blue Trust, Inc.113$188.9K0.00%+36+46.8%Added
State of Alaska, Department of Revenue117$195.0K0.00%+117New
Xponance, Inc.120$200.6K0.00%00.0%Unchanged
Roehl & Yi Investment Advisors, LLC120$200.6K0.09%00.0%Unchanged
Merit Financial Group, LLC120$200.6K0.00%−2−1.6%Reduced
US Bancorp123$205.6K0.00%+8+7.0%Added
Columbia Asset Management125$208.9K0.04%00.0%Unchanged
Amalgamated Bank125$209.0K0.00%−5−3.8%Reduced
HB Wealth Management, LLC126$210.6K0.00%+126New
Pinnacle Associates Ltd127$212.3K0.00%00.0%Unchanged
Connable Office Inc129$215.6K0.02%00.0%Unchanged
Requisite Capital Management, LLC129$215.6K0.04%+129New
Sagespring Wealth Partners, LLC132$220.7K0.00%−1−0.8%Reduced
NewEdge Wealth, LLC117$222.0K0.00%+117New
Quadrant Capital Group LLC133$222.3K0.01%00.0%Unchanged
Utah Retirement Systems134$224.0K0.00%00.0%Unchanged
Chapman Investment Management, LLC143$239.0K0.17%00.0%Unchanged
Freestone Grove Partners LP144$240.7K0.00%+144New
Evergreen Capital Management LLC146$244.0K0.01%+31+27.0%Added
Mercer Global Advisors Inc147$245.7K0.00%+29+24.6%Added
Kestra Advisory Services, LLC149$249.8K0.00%+21+16.4%Added
Douglass Winthrop Advisors, LLC150$250.7K0.00%−5−3.2%Reduced
Moneta Group Investment Advisors LLC150$250.7K0.00%00.0%Unchanged