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White Mountains Insurance

320 hedge funds and large institutions have $4.38B invested in White Mountains Insurance in 2025 Q1 according to their latest regulatory filings, with 26 funds opening new positions, 102 increasing their positions, 107 reducing their positions, and 27 closing their positions.

New
Increased
Maintained
Reduced
Closed

more funds holding in top 10

Funds holding in top 10:

more ownership

Funds ownership:

less funds holding

Funds holding:

less capital invested

Capital invested by funds: $ → $

4% less first-time investments, than exits

New positions opened: 26 | Existing positions closed: 27

5% less repeat investments, than reductions

Existing positions increased: 102 | Existing positions reduced: 107

Holders
320
Holders Change
Holders Change %
% of All Funds
Holding in Top 10
7
Holding in Top 10 Change
Holding in Top 10 Change %
% of All Funds
New
Increased
Reduced
Closed
Calls
Puts
Net Calls
Net Calls Change
Name Holding Trade Value Shares
Change
Change in
Stake
101
$2.08M
102
$2.07M
103
$2.04M
104
$1.95M
105
$1.93M
106
$1.91M
107
$1.84M
108
$1.78M
109
$1.71M
110
$1.7M
111
$1.68M
112
$1.67M
113
$1.59M
114
$1.56M
115
$1.54M
116
$1.53M
117
$1.47M
118
$1.46M
119
$1.42M
120
$1.41M
121
$1.39M
122
$1.35M
123
$1.33M
124
$1.31M
125
$1.31M