WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)
SEC filings, insider trading & institutional ownership from EDGAR.
Institutions
37
$2.08B held
Latest filings
10-K, 10-Q, 8-K, Form 4 & 13D/G. Sourced directly from SEC EDGAR
No filings are available yet.
Top holders
13F & 13D/G · latest quarter
| Holder | Filed | Value |
|---|---|---|
| Dimensional Fund Advisors LP | Aug 11, 2026 | $329.58M |
| Neuberger Berman Group LLC | Aug 13, 2026 | $247.03M |
| BlackRock, Inc. | Aug 7, 2026 | $244.39M |
| Vanguard Portfolio Management | Aug 13, 2026 | $232.16M |
| Vanguard Capital Management | Aug 13, 2026 | $222.85M |
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Data as of Sep 16, 2026Source: SEC EDGAR.