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White Mountains Insurance

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 26 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
322
Holders Change
+4
Holders Change %
+1.26%
% 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
26
Calls
Puts
Net Calls
Net Calls Change
Name Holding Trade Value Shares
Change
Shares
Change %
PS
201
Principal Securities
Iowa
$359K +$26.9K +15 +8%
NRS
202
Neville Rodie & Shaw
New York
$359K
FNFDCM
203
Folger Nolan Fleming Douglas Capital Management
District of Columbia
$357K
Bank of Nova Scotia
204
Bank of Nova Scotia
Ontario, Canada
$352K +$73.6K +41 +26%
VT
205
Vise Technologies
New York
$352K +$352K +196 New
SC
206
Savant Capital
Illinois
$345K +$80.8K +45 +31%
MAM
207
Martingale Asset Management
Massachusetts
$343K -$747K -416 -69%
TRCT
208
Tower Research Capital (TRC)
New York
$341K +$233K +130 +217%
BNP Paribas Financial Markets
209
BNP Paribas Financial Markets
France
$338K +$73.6K +41 +28%
JIC
210
Johnson Investment Counsel
Ohio
$332K
GI
211
GAMMA Investing
California
$327K +$190K +106 +139%
AAP
212
Arax Advisory Partners
Colorado
$326K -$1.8K -1 -0.5%
FRA
213
Frank Rimerman Advisors
California
$318K -$8.98K -5 -3%
MOS
214
MGO One Seven
Ohio
$314K
CL
215
Choreo LLC
Illinois
$311K +$1.8K +1 +0.6%
TSS
216
Two Sigma Securities
New York
$305K -$77.2K -43 -20%
NA
217
NewEdge Advisors
Louisiana
$305K
SCM
218
Sterling Capital Management
North Carolina
$300K +$53.9K +30 +22%
IP
219
Isthmus Partners
Wisconsin
$294K
CGH
220
Crossmark Global Holdings
Texas
$284K +$66.4K +37 +31%
KeyBank National Association
221
KeyBank National Association
Ohio
$284K -$44.9K -25 -14%
Prudential Financial
222
Prudential Financial
New Jersey
$279K +$279K +150 New
DWA
223
Douglass Winthrop Advisors
New York
$278K -$64.6K -36 -19%
MGIA
224
Moneta Group Investment Advisors
Missouri
$269K
ZIM
225
Zacks Investment Management
Illinois
$266K