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White Mountains Insurance
WTM

Overview Fund Activity

322 hedge funds and large institutions have $4.17B invested in White Mountains Insurance in 2025 Q2 according to their latest regulatory filings, with 34 funds opening new positions, 103 increasing their positions, 110 reducing their positions, and 27 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
322
Holders Change
+3
Holders Change %
+0.94%
% of All Funds
4.32%
Holding in Top 10
5
Holding in Top 10 Change
-2
Holding in Top 10 Change %
-28.57%
% of All Funds
0.07%
New
34
Increased
103
Reduced
110
Closed
27
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

1
Neuberger Berman Group
Neuberger Berman Group
New York
+$48.2M
2
CB
Cooke & Bieler
Pennsylvania
+$39.7M
3
BFS
Bradley Foster & Sargent
Connecticut
+$9.92M
4
Jane Street
Jane Street
New York
+$9.86M
5
HF
HRT Financial
New York
+$9.13M

Top Sellers

1
First Trust Advisors
First Trust Advisors
Illinois
-$31M
2
Select Equity Group
Select Equity Group
New York
-$18.2M
3
Fuller & Thaler Asset Management
Fuller & Thaler Asset Management
California
-$16.4M
4
APF
Alaska Permanent Fund
Alaska
-$10.4M
5
Morgan Stanley
Morgan Stanley
New York
-$10M
Name Holding Trade Value Shares
Change 		Shares
Change %
SAM
26
Southeastern Asset Management
Tennessee
$37.9M +$4.69M +2,610 +14%
Brown Advisory
27
Brown Advisory
Maryland
$37.4M -$2.19M -1,222 -6%
Select Equity Group
28
Select Equity Group
New York
$32.1M -$18.2M -10,127 -36%
Robeco Institutional Asset Management
29
Robeco Institutional Asset Management
Netherlands
$32M -$2.39M -1,332 -7%
Victory Capital Management
30
Victory Capital Management
Texas
$31.7M +$2.78M +1,549 +10%
Envestnet Asset Management
31
Envestnet Asset Management
Illinois
$31.4M +$435K +242 +1%
Northern Trust
32
Northern Trust
Illinois
$31.3M -$1.47M -817 -4%
EP
33
Elkhorn Partners
Nebraska
$26.8M -$8.98K -5 -0%
WCM Investment Management
34
WCM Investment Management
California
$23.4M -$264K -148 -1%
UBS AM
35
UBS AM
Illinois
$22M +$1.78M +989 +9%
STCG
36
Speece Thorson Capital Group
Minnesota
$20.4M +$402K +224 +2%
HKAM
37
Horizon Kinetics Asset Management
New York
$19.7M -$672K -374 -3%
Bank of New York Mellon
38
Bank of New York Mellon
New York
$19.5M -$3.07M -1,710 -14%
California Public Employees Retirement System
39
California Public Employees Retirement System
California
$18.7M -$2.05M -1,141 -10%
Wells Fargo
40
Wells Fargo
California
$17.2M +$426K +237 +3%
TSW
41
Thompson Siegel & Walmsley
Virginia
$14.9M -$21.5K -12 -0.1%
GKIM
42
GW&K Investment Management
Massachusetts
$14.9M -$350K -195 -2%
AQR Capital Management
43
AQR Capital Management
Connecticut
$14.4M -$729K -408 -5%
EP
44
Edgestream Partners
New Jersey
$14M +$7.67M +4,269 +121%
PL
45
Perpetual Ltd
Australia
$13.9M – – –
Goldman Sachs
46
Goldman Sachs
New York
$12.4M +$4.72M +2,626 +62%
Hotchkis & Wiley Capital Management
47
Hotchkis & Wiley Capital Management
California
$12.3M -$43.1K -24 -0.3%
RA
48
Royce & Associates
New York
$11.9M -$8.95M -4,985 -43%
American Century Companies
49
American Century Companies
Missouri
$11.4M -$1.2M -671 -10%
Jane Street
50
Jane Street
New York
$10.9M +$9.86M +5,493 +950%
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