WHITE MOUNTAINS INSURANCE GROUP LTD - Common Stock (WTM)

Historical Holders from Q1 2014 to Q4 2025

Type / Class
Equity / Common Stock
Symbol
WTM on NYSE
Shares outstanding
2,550,731
Price per share
$2078.03
All holders as of 30 Sep 2025
Q3 2025
Total 13F shares as of 30 Sep 2025
2,328,831
Holdings value
$3,894,232,988
% of all portfolios
0.01%
Share change
+7,751
Value change
+$8,138,396
Average buys %
+0%
Average sells %
-0%
Number of holders
334
Price from insider filings
$2078.03
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of WHITE MOUNTAINS INSURANCE GROUP LTD - Common Stock (WTM) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
MORGAN STANLEY 5.2% -17% $221,707,123 -$44,098,051 132,638 -17% Morgan Stanley 30 Sep 2025
As of 30 Sep 2025, WHITE MOUNTAINS INSURANCE GROUP LTD - Common Stock (WTM) has 334 institutional shareholders filing 13F forms. They hold 2,328,831 shares of 2,550,731 outstanding shares (91%) .

Top 25 institutional shareholders own 73% of the company.

Filer Ownership Nb Shares Share Change % Portfolio % Holdings Value
VANGUARD GROUP INC 9.7% 247,004 -0.87% 0.01% $412,872,126
DIMENSIONAL FUND ADVISORS LP 6.2% 157,217 +0.94% 0.06% $262,792,354
MORGAN STANLEY 5.4% 138,862 -16% 0.01% $232,114,441
NEUBERGER BERMAN GROUP LLC 4.5% 115,015 +37% 0.14% $192,249,873
BlackRock, Inc. 4.4% 112,579 -0.51% 0% $188,177,273
River Road Asset Management, LLC 4.3% 109,588 -0.28% 2.1% $183,178,534
FULLER & THALER ASSET MANAGEMENT, INC. 4.2% 108,091 +7% 0.61% $180,676,756
COOKE & BIELER LP 4.2% 107,851 +40% 1.9% $180,275,104
FIDUCIARY MANAGEMENT INC /WI/ 3.7% 94,383 +32% 1.6% $157,763,072
Boston Partners 3.3% 84,445 -5.5% 0.15% $142,516,897
Wallace Capital Management Inc. 3.2% 81,489 +3.1% 17% $136,210,177
LONDON CO OF VIRGINIA 2.6% 66,802 -2.9% 0.62% $111,677,110
STATE STREET CORP 2.1% 54,444 -4.9% 0% $91,004,235
T. Rowe Price Investment Management, Inc. 1.9% 47,772 -24% 0.05% $79,852,000
GEODE CAPITAL MANAGEMENT, LLC 1.7% 42,090 -1% 0% $70,368,669
REINHART PARTNERS, LLC. 1.6% 41,609 -0.2% 2.3% $69,578,230
BANK OF AMERICA CORP /DE/ 1.5% 38,812 -1.5% 0% $64,875,075
LORD, ABBETT & CO. LLC 1.4% 36,919 +15% 0.18% $61,711,000
Allspring Global Investments Holdings, LLC 1.2% 31,698 +7.1% 0.08% $52,317,550
SOUTHEASTERN ASSET MANAGEMENT INC/TN/ 1.2% 31,652 +50% 2.7% $52,906,951
RAYMOND JAMES FINANCIAL INC 1.2% 29,392 -4.2% 0.02% $49,129,334
Cannell & Spears LLC 1.1% 28,288 -0.21% 0.89% $47,283,279
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.95% 24,232 +0.2% 0.01% $40,504,273
Mraz, Amerine & Associates, Inc. 0.89% 22,606 +4.8% 5.9% $37,786,702
BROWN ADVISORY INC 0.8% 20,332 -2.5% 0.04% $33,986,810

Institutional Holders of WHITE MOUNTAINS INSURANCE GROUP LTD - Common Stock (WTM) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price Investors
2025 Q4 2,962 $6,147,863 +$10,377 $2078.03 9
2025 Q3 2,328,831 $3,894,232,988 +$8,138,396 $1671.52 334
2025 Q2 2,319,591 $4,164,032,974 +$75,999,210 $1795.72 323
2025 Q1 2,276,618 $4,380,633,799 -$297,814 $1925.81 317
2024 Q4 2,275,635 $4,425,004,151 +$122,812,596 $1945.06 321
2024 Q3 2,194,681 $3,726,150,013 -$106,970,336 $1696.20 302
2024 Q2 2,278,428 $4,139,215,819 +$92,492,867 $1817.45 304
2024 Q1 2,228,171 $3,997,328,163 +$24,600,244 $1794.30 298
2023 Q4 1,783 $2,684,225 -$13,545 $1505.45 4
2023 Q3 2,040,561 $3,051,916,032 +$34,544,866 $1495.69 268
2023 Q2 2,218,355 $3,087,668,218 -$41,759,592 $1388.91 255
2023 Q1 2,233,085 $3,077,058,638 -$13,661,433 $1377.49 258
2022 Q4 2,251,062 $3,184,483,349 +$153,883,548 $1414.33 257
2022 Q3 2,245,618 $2,927,071,277 -$483,926,136 $1303.02 238
2022 Q2 2,659,550 $3,314,881,142 -$1,358,504 $1246.12 256
2022 Q1 2,661,888 $3,016,791,638 +$50,277,602 $1136.23 239
2021 Q4 2,675,639 $2,713,954,971 -$5,475,659 $1013.88 241
2021 Q3 2,670,920 $2,857,212,897 -$38,417,306 $1069.62 227
2021 Q2 2,711,880 $3,113,222,126 +$8,103,653 $1148.03 231
2021 Q1 2,708,558 $3,023,857,431 +$25,603,848 $1114.90 244
2020 Q4 2,695,102 $2,696,910,917 -$493,407 $1000.00 232
2020 Q3 2,553,646 $1,989,377,317 -$12,029,780 $779.00 208
2020 Q2 2,719,985 $2,415,302,063 -$14,621,023 $887.97 203
2020 Q1 2,706,186 $2,462,534,570 -$33,281,241 $910.00 224
2019 Q4 2,742,733 $3,059,621,362 -$32,820,157 $1115.51 251
2019 Q3 2,774,124 $2,995,831,040 -$25,949,015 $1080.00 248
2019 Q2 2,801,544 $2,861,708,573 +$52,326,535 $1021.44 248
2019 Q1 2,806,019 $2,596,957,316 +$38,786,310 $925.48 242
2018 Q4 2,767,025 $2,373,351,225 -$10,918,492 $857.69 241
2018 Q3 2,774,056 $2,596,065,055 -$16,801,706 $935.86 237
2018 Q2 2,821,237 $2,557,724,601 -$299,600,653 $906.61 226
2018 Q1 3,185,246 $2,619,987,419 +$51,109,512 $822.52 226
2017 Q4 3,117,597 $2,653,931,973 +$4,187,400 $851.28 213
2017 Q3 3,103,392 $2,659,763,464 -$624,620,200 $857.00 192
2017 Q2 3,833,159 $3,329,588,785 +$2,466,052 $868.63 203
2017 Q1 3,828,400 $3,367,794,853 +$213,972,416 $879.88 198
2016 Q4 3,763,752 $3,146,717,237 -$19,880,079 $836.05 201
2016 Q3 3,747,560 $3,110,257,790 -$324,033,583 $830.00 185
2016 Q2 4,155,093 $3,498,581,866 -$387,974,682 $842.00 195
2016 Q1 4,597,711 $3,689,966,980 -$155,783,699 $802.60 189
2015 Q4 4,830,248 $3,510,683,031 -$59,414,877 $726.81 190
2015 Q3 4,914,071 $3,672,278,331 -$62,208,398 $747.30 179
2015 Q2 4,997,583 $3,273,103,925 +$5,293,830 $654.94 167
2015 Q1 5,033,553 $3,444,985,757 +$9,592,278 $684.52 171
2014 Q4 5,024,007 $3,166,111,783 -$33,861,409 $630.11 176
2014 Q3 5,071,588 $3,195,507,910 -$67,733,833 $630.07 163
2014 Q2 5,160,617 $3,139,939,676 +$20,767,642 $608.44 176
2014 Q1 5,123,595 $3,073,574,263 -$2,942,762 $599.90 180