Institutional Ownership
White Mtns Ins Group Ltd
CUSIP G9618E107COMQ1 2026
13D / 13G Filings
31
Schedule 13D/13G on record
Beneficial Filers
10
Distinct reporting persons
Largest Stake
10.0%
Max % of class reported
Institutional Holders
357
13F filers (latest quarter)
Beneficial Owners — Schedule 13D / 13G
31 filings · latest Feb 12, 2026
| # | Filed | Reporting Person | Form | % of Class | Shares | Filing |
|---|---|---|---|---|---|---|
| 1 | Feb 12, 2026 | Morgan Stanley | 13G/A | 3.0% | 76.8K | SEC |
| 2 | Feb 5, 2026 | Neuberger Berman Group LLC | 13G | 5.1% | 129.7K | SEC |
| 3 | Nov 7, 2025 | Morgan Stanley | 13G/A | 5.2% | 132.6K | SEC |
| 4 | Aug 7, 2025 | Morgan Stanley | 13G/A | 6.2% | 159.0K | SEC |
| 5 | Nov 12, 2024 | Fuller & Thaler Asset Management, Inc. | 13G/A | 4.8% | 122.3K | SEC |
| 6 | Feb 13, 2024 | Vanguard Group Inc | 13G/A | 9.9% | 253.4K | SEC |
| 7 | Feb 12, 2024 | Fuller & Thaler Asset Management, Inc. | 13G/A | 5.1% | 129.5K | SEC |
| 8 | Feb 9, 2024 | Morgan Stanley | 13G/A | 7.2% | 185.6K | SEC |
| 9 | Feb 9, 2024 | Dimensional Fund Advisors LP | 13G/A | 6.3% | 162.0K | SEC |
| 10 | Jun 8, 2023 | River Road Asset Management, LLC | 13G/A | 4.9% | 125.2K | SEC |
21 more beneficial-ownership filings on Premium
See the full Schedule 13D/13G history for White Mtns Ins Group Ltd.
Unlock full historyTop Institutional Holders (13F)
Largest reported positions · latest quarter
| # | Fund | Shares | Value |
|---|---|---|---|
| 1 | Dimensional Fund Advisors LP | 156.6K | $344.08M |
| 2 | Neuberger Berman Group LLC | 124.7K | $273.99M |
| 3 | River Road Asset Management, LLC | 120.5K | $264.78M |
| 4 | Blackrock, Inc. | 113.3K | $248.98M |
| 5 | Cooke & Bieler LP | 104.9K | $230.37M |
| 6 | Fuller & Thaler Asset Management, Inc. | 104.6K | $229.72M |
| 7 | Fiduciary Management Inc /Wi/ | 85.1K | $186.89M |
| 8 | Wallace Capital Management Inc. | 78.8K | $173.11M |
| 9 | Morgan Stanley | 59.3K | $130.27M |
| 10 | Boston Partners | 57.5K | $126.22M |