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Livermore
Livermore
ZHEN

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.

Q2 2025 vs. Q1 2025

How the institutions holding White Mountains Insurance Group Ltd changed between Q1 2025 and Q2 2025.

All holders in Q2 2025All holders in Q1 2025

13F holders of WTM: Q1 2025 compared with Q2 2025
MeasureQ1 2025Of which not filed for Q2 2025Q2 2025Change
Holders3224325+7
Shares2.31M7702.32M+12.3K (+0.5%)
Value$4.44B$1.48M$4.17B−$275.8M (−6.2%)

4 institutions that held it in Q1 2025 haven't filed for Q2 2025 yet. Not filing isn't selling, so the changes leave them out.

New holders (33)

Institutions that held White Mountains Insurance Group Ltd at the end of Q2 2025 but not at the end of Q1 2025.

Institutions new to WTM in Q2 2025
InstitutionSharesValue% of portfolio
Bradley Foster & Sargent Inc5,522$9.92M0.16%
HRT Financial LP5,087$9.13M0.04%
Gotham Asset Management, LLC960$1.72M0.01%
Park Avenue Securities LLC637$1.14M0.01%
B.O.S.S. Retirement Advisors, LLC533$957.1K0.24%
Glenmede Investment Management, LP374$671.6K0.00%
Global Retirement Partners, LLC328$589.0K0.01%
Walleye Capital LLC300$538.7K0.00%
Jain Global LLC300$538.7K0.01%
SummitTX Capital, L.P.299$536.9K0.02%
Petrus Trust Company, LTA238$427.4K0.04%
Premier Fund Managers Ltd221$395.0K0.01%
Vise Technologies, Inc.196$352.0K0.01%
Prudential Financial Inc150$278.6K0.00%
Bryn Mawr Trust Co140$251.4K0.00%
Merit Financial Group, LLC122$219.1K0.00%
Avantax Advisory Services, Inc.121$217.5K0.00%
Vident Advisory, LLC120$215.5K0.00%
Mercer Global Advisors Inc118$211.9K0.00%
Mount Yale Investment Advisors, LLC76$136.5K0.01%
State of Wyoming76$136.5K0.02%
Stephenson National Bank & Trust26$46.7K0.02%
BNP PARIBAS ASSET MANAGEMENT Holding S.A.22$40.0K0.00%
CoreFirst Bank & Trust4$7.18K0.00%
Bayforest Capital Ltd4$7.18K0.00%
South State Corp.3$5.39K0.00%
Kilter Group LLC2$3.59K0.00%
Twin Peaks Wealth Advisors, LLC1$1.82K0.00%
Assetmark, Inc1$1.80K0.00%
Tortoise Investment Management, LLC1$1.80K0.00%
IFP Advisors, Inc1$1.80K0.00%
Stephens Consulting, LLC1$1.80K0.00%
Financial Network Wealth Advisors LLC1$1.80K0.00%

Sold out (26)

Institutions that held White Mountains Insurance Group Ltd at the end of Q1 2025 and filed for Q2 2025 without it.

Institutions that sold out of WTM in Q2 2025
InstitutionShares, Q1 2025Value, Q1 2025
Alaska Permanent Fund Corp5,902$10.4M
Dark Forest Capital Management LP1,491$2.87M
Schonfeld Strategic Advisors LLC800$1.54M
Virginia Retirement Systems Et Al700$1.35M
SG Americas Securities, LLC689$1.33M
Ofi Invest Asset Management736$1.31M
Renaissance Technologies LLC600$1.16M
TownSquare Capital, LLC357$687.5K
Susquehanna Fundamental Investments, LLC331$637.4K
Two Sigma Investments, LP300$577.7K
Vestcor Inc219$422.0K
Pitcairn Co133$256.1K
Principal Financial Group Inc125$240.7K
HB Wealth Management, LLC121$233.0K
Magnetar Financial LLC118$227.2K
Glenview Trust Co110$211.8K
Brinker Capital Investments, LLC108$208.0K
HBK Sorce Advisory LLC108$208.0K
Ballentine Partners, LLC106$204.1K
Custom Index Systems, LLC104$200.3K
Coldstream Capital Management Inc94$181.0K
Stonebridge Financial Group, LLC60$115.5K
Quent Capital, LLC56$107.8K
Hexagon Capital Partners LLC17$32.7K
Corebridge Financial, Inc.17$32.7K
Mather Group, LLC.1$1.93K

Not filed for Q2 2025 yet (4)

Institutions that held White Mountains Insurance Group Ltd at the end of Q1 2025 and haven't filed a 13F for Q2 2025. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding WTM in Q1 2025 that haven't filed for Q2 2025
InstitutionShares, Q1 2025Value, Q1 2025
Glenmede Trust Co NA370$712.5K
CAPROCK Group, Inc.184$354.3K
Orion Portfolio Solutions, LLC108$208.0K
Lindbrook Capital, LLC108$208.0K