Institutional Ownership
White Mtns Ins Group Ltd
CUSIP G9618E107COMQ1 2026
Institutional Holders
357
13F filers
Shares Held
1.96M
Aggregate institutional
Institutional Value
$4.08B
Q1 2026
Net New Holders
+17
42 new · 25 closed
Institutional Ownership Trend
Aggregate 13F value by quarter
Multi-quarter trend — upgrade to see history
UpgradePosition Activity
Q1 2026
New positions42
Increased119
Decreased109
Sold out25
Institutional Holders
357 funds hold this security · Q1 2026
| # | Fund | Shares | Value | Δ Shares | Activity |
|---|---|---|---|---|---|
| 1 | Dimensional Fund Advisors LP | 156.6K | $344.08M | +14 | Added |
| 2 | Neuberger Berman Group LLC | 124.7K | $273.99M | −4.9K | Reduced |
| 3 | River Road Asset Management, LLC | 120.5K | $264.78M | −361 | Reduced |
| 4 | Blackrock, Inc. | 113.3K | $248.98M | +1.0K | Added |
| 5 | Cooke & Bieler LP | 104.9K | $230.37M | −1.7K | Reduced |
| 6 | Fuller & Thaler Asset Management, Inc. | 104.6K | $229.72M | −3.6K | Reduced |
| 7 | Fiduciary Management Inc /Wi/ | 85.1K | $186.89M | −5.3K | Reduced |
| 8 | Wallace Capital Management Inc. | 78.8K | $173.11M | −1.6K | Reduced |
| 9 | Morgan Stanley | 59.3K | $130.27M | −22.9K | Reduced |
| 10 | Boston Partners | 57.5K | $126.22M | −19.5K | Reduced |
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