WTM Institutional Ownership
Top institutional (13F) holders of WTM and 5%+ (13D/G) positions, sourced from SEC EDGAR.
Institutional owners
44
Institutional value
$2.26B
Top holder
Dimensional Fund Advisors LP
Couldn’t find the data you were looking for?
We haven’t added WHITE MOUNTAINS INSURANCE GROUP LTD’s filings yet. We add companies and filings all the time.
Track WTM and we’ll email you the moment its filings are in, free and with no account. Or create a free account to request coverage.
Top holders
| Holder | Filed | Value |
|---|---|---|
| Dimensional Fund Advisors LPinvestment advisor | Nov 4, 2026 | $322.24M |
| Neuberger Berman Group LLCinvestment advisor | Oct 27, 2026 | $247.03M |
| BlackRock, Inc.holding company | Aug 7, 2026 | $244.39M |
| Vanguard Portfolio Managementinvestment advisor | Aug 13, 2026 | $232.16M |
| Vanguard Capital Managementinvestment advisor | Aug 13, 2026 | $222.85M |
| Boston Partnersinvestment advisor | Aug 4, 2026 | $115.28M |
| STATE STREET CORPORATIONholding company | Sep 22, 2026 | $104.2M |
| MORGAN STANLEYholding company | Aug 13, 2026 | $97.18M |
| GEODE CAPITAL MANAGEMENT, LLCinvestment advisor | Nov 6, 2026 | $79.05M |
| Norges Bankother | Aug 12, 2026 | $57.96M |
| BANK OF AMERICA CORP /DE/holding company | Aug 14, 2026 | $51.89M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INCinvestment advisor | Aug 14, 2026 | $48.74M |
| BROWN ADVISORY INCinvestment advisor | Aug 15, 2026 | $36.75M |
| JANE STREET GROUP, LLCholding company | Aug 14, 2026 | $35.72M |
| SOUTHEASTERN ASSET MANAGEMENT INC/TN/investment advisor | Aug 14, 2026 | $35.46M |
| UBS Group AGbank | Aug 13, 2026 | $33.58M |
| NORTHERN TRUST CORPinvestment advisor | Aug 13, 2026 | $30.21M |
| WELLINGTON MANAGEMENT GROUP LLPinvestment advisor | Aug 14, 2026 | $30.13M |
| GOLDMAN SACHS GROUP INCinvestment advisor | Aug 14, 2026 | $25.19M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLPinvestment advisor | May 15, 2026 | $24.09M |
| WELLS FARGO & COMPANY/MNinvestment advisor | Aug 14, 2026 | $18.06M |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIPinvestment advisor | Aug 13, 2026 | $15.1M |
| Bank of New York Mellon Corpholding company | Nov 5, 2026 | $14.98M |
| CITADEL ADVISORS LLCinvestment advisor | Sep 1, 2026 | $14.8M |
| D. E. Shaw & Co., Inc.investment advisor | Aug 14, 2026 | $13.72M |
5%+ holders
Current stakes of 5% or more from Schedule 13D and 13G filings. A joint filing shows once, under its lead filer.
No current 5%+ holders of WTM on file.
Never miss a WTM filing.
Get an email when WTM files its next 8-K, Form 4, 10-K or 10-Q with the SEC. Free, no account needed.
Free foreverNo account requiredOne-click unsubscribe
Source: SEC EDGAR Schedule 13D / 13G and 13F filings.