Form 8-K - Current report:
SEC Accession No. 0001628280-25-044062
Filing Date
2025-10-03
Accepted
2025-10-03 16:20:21
Documents
139
Period of Report
2025-10-02
Items
Item 1.01: Entry into a Material Definitive Agreement
Item 9.01: Financial Statements and Exhibits

Document Format Files

Seq Description Document Type Size
1 8-K wtm-20251002.htm   iXBRL 8-K 40180
2 EX-2.1 wtmexhibit21.htm EX-2.1 455064
3 EX-99.1 wtmexhibit991.htm EX-99.1 28810
7 image1.jpg GRAPHIC 65797
8 picture1.jpg GRAPHIC 6667
9 wtmexhibit21001.jpg GRAPHIC 78082
10 wtmexhibit21002.jpg GRAPHIC 171937
11 wtmexhibit21003.jpg GRAPHIC 205920
12 wtmexhibit21004.jpg GRAPHIC 184137
13 wtmexhibit21005.jpg GRAPHIC 152459
14 wtmexhibit21006.jpg GRAPHIC 292163
15 wtmexhibit21007.jpg GRAPHIC 320104
16 wtmexhibit21008.jpg GRAPHIC 315985
17 wtmexhibit21009.jpg GRAPHIC 216359
18 wtmexhibit21010.jpg GRAPHIC 260647
19 wtmexhibit21011.jpg GRAPHIC 264353
20 wtmexhibit21012.jpg GRAPHIC 278398
21 wtmexhibit21013.jpg GRAPHIC 259455
22 wtmexhibit21014.jpg GRAPHIC 201223
23 wtmexhibit21015.jpg GRAPHIC 227039
24 wtmexhibit21016.jpg GRAPHIC 297411
25 wtmexhibit21017.jpg GRAPHIC 318494
26 wtmexhibit21018.jpg GRAPHIC 301448
27 wtmexhibit21019.jpg GRAPHIC 341886
28 wtmexhibit21020.jpg GRAPHIC 330973
29 wtmexhibit21021.jpg GRAPHIC 290266
30 wtmexhibit21022.jpg GRAPHIC 277263
31 wtmexhibit21023.jpg GRAPHIC 322872
32 wtmexhibit21024.jpg GRAPHIC 298763
33 wtmexhibit21025.jpg GRAPHIC 291826
34 wtmexhibit21026.jpg GRAPHIC 317058
35 wtmexhibit21027.jpg GRAPHIC 220035
36 wtmexhibit21028.jpg GRAPHIC 261612
37 wtmexhibit21029.jpg GRAPHIC 274654
38 wtmexhibit21030.jpg GRAPHIC 311178
39 wtmexhibit21031.jpg GRAPHIC 326178
40 wtmexhibit21032.jpg GRAPHIC 277695
41 wtmexhibit21033.jpg GRAPHIC 264218
42 wtmexhibit21034.jpg GRAPHIC 250613
43 wtmexhibit21035.jpg GRAPHIC 291164
44 wtmexhibit21036.jpg GRAPHIC 272544
45 wtmexhibit21037.jpg GRAPHIC 276028
46 wtmexhibit21038.jpg GRAPHIC 287652
47 wtmexhibit21039.jpg GRAPHIC 314968
48 wtmexhibit21040.jpg GRAPHIC 249898
49 wtmexhibit21041.jpg GRAPHIC 263203
50 wtmexhibit21042.jpg GRAPHIC 292176
51 wtmexhibit21043.jpg GRAPHIC 298835
52 wtmexhibit21044.jpg GRAPHIC 328779
53 wtmexhibit21045.jpg GRAPHIC 323144
54 wtmexhibit21046.jpg GRAPHIC 253433
55 wtmexhibit21047.jpg GRAPHIC 298327
56 wtmexhibit21048.jpg GRAPHIC 314249
57 wtmexhibit21049.jpg GRAPHIC 339465
58 wtmexhibit21050.jpg GRAPHIC 337940
59 wtmexhibit21051.jpg GRAPHIC 292684
60 wtmexhibit21052.jpg GRAPHIC 259303
61 wtmexhibit21053.jpg GRAPHIC 270786
62 wtmexhibit21054.jpg GRAPHIC 251124
63 wtmexhibit21055.jpg GRAPHIC 281919
64 wtmexhibit21056.jpg GRAPHIC 309786
65 wtmexhibit21057.jpg GRAPHIC 279073
66 wtmexhibit21058.jpg GRAPHIC 324319
67 wtmexhibit21059.jpg GRAPHIC 329651
68 wtmexhibit21060.jpg GRAPHIC 331122
69 wtmexhibit21061.jpg GRAPHIC 307801
70 wtmexhibit21062.jpg GRAPHIC 339578
71 wtmexhibit21063.jpg GRAPHIC 338972
72 wtmexhibit21064.jpg GRAPHIC 343713
73 wtmexhibit21065.jpg GRAPHIC 341846
74 wtmexhibit21066.jpg GRAPHIC 322445
75 wtmexhibit21067.jpg GRAPHIC 286836
76 wtmexhibit21068.jpg GRAPHIC 296964
77 wtmexhibit21069.jpg GRAPHIC 280173
78 wtmexhibit21070.jpg GRAPHIC 275873
79 wtmexhibit21071.jpg GRAPHIC 309286
80 wtmexhibit21072.jpg GRAPHIC 306544
81 wtmexhibit21073.jpg GRAPHIC 327361
82 wtmexhibit21074.jpg GRAPHIC 293690
83 wtmexhibit21075.jpg GRAPHIC 254010
84 wtmexhibit21076.jpg GRAPHIC 332617
85 wtmexhibit21077.jpg GRAPHIC 271275
86 wtmexhibit21078.jpg GRAPHIC 242782
87 wtmexhibit21079.jpg GRAPHIC 274391
88 wtmexhibit21080.jpg GRAPHIC 277939
89 wtmexhibit21081.jpg GRAPHIC 326635
90 wtmexhibit21082.jpg GRAPHIC 290603
91 wtmexhibit21083.jpg GRAPHIC 212163
92 wtmexhibit21084.jpg GRAPHIC 136629
93 wtmexhibit21085.jpg GRAPHIC 204423
94 wtmexhibit21086.jpg GRAPHIC 214350
95 wtmexhibit21087.jpg GRAPHIC 210549
96 wtmexhibit21088.jpg GRAPHIC 206752
97 wtmexhibit21089.jpg GRAPHIC 219007
98 wtmexhibit21090.jpg GRAPHIC 198988
99 wtmexhibit21091.jpg GRAPHIC 227830
100 wtmexhibit21092.jpg GRAPHIC 299356
101 wtmexhibit21093.jpg GRAPHIC 251088
102 wtmexhibit21094.jpg GRAPHIC 238560
103 wtmexhibit21095.jpg GRAPHIC 269676
104 wtmexhibit21096.jpg GRAPHIC 285668
105 wtmexhibit21097.jpg GRAPHIC 317109
106 wtmexhibit21098.jpg GRAPHIC 290705
107 wtmexhibit21099.jpg GRAPHIC 289552
108 wtmexhibit21100.jpg GRAPHIC 318306
109 wtmexhibit21101.jpg GRAPHIC 267778
110 wtmexhibit21102.jpg GRAPHIC 327449
111 wtmexhibit21103.jpg GRAPHIC 253925
112 wtmexhibit21104.jpg GRAPHIC 262548
113 wtmexhibit21105.jpg GRAPHIC 228862
114 wtmexhibit21106.jpg GRAPHIC 305009
115 wtmexhibit21107.jpg GRAPHIC 312449
116 wtmexhibit21108.jpg GRAPHIC 303065
117 wtmexhibit21109.jpg GRAPHIC 332606
118 wtmexhibit21110.jpg GRAPHIC 333292
119 wtmexhibit21111.jpg GRAPHIC 304362
120 wtmexhibit21112.jpg GRAPHIC 331336
121 wtmexhibit21113.jpg GRAPHIC 339334
122 wtmexhibit21114.jpg GRAPHIC 321750
123 wtmexhibit21115.jpg GRAPHIC 316531
124 wtmexhibit21116.jpg GRAPHIC 298801
125 wtmexhibit21117.jpg GRAPHIC 270512
126 wtmexhibit21118.jpg GRAPHIC 93942
127 wtmexhibit21119.jpg GRAPHIC 68942
128 wtmexhibit21120.jpg GRAPHIC 36030
129 wtmexhibit21121.jpg GRAPHIC 40008
130 wtmexhibit21122.jpg GRAPHIC 36881
131 wtmexhibit21123.jpg GRAPHIC 38845
  Complete submission text file 0001628280-25-044062.txt   46529748

Data Files

Seq Description Document Type Size
4 XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT wtm-20251002.xsd EX-101.SCH 1872
5 XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT wtm-20251002_lab.xml EX-101.LAB 21629
6 XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT wtm-20251002_pre.xml EX-101.PRE 12790
141 EXTRACTED XBRL INSTANCE DOCUMENT wtm-20251002_htm.xml XML 2733
Mailing Address 23 SOUTH MAIN STREET SUITE 3B HANOVER NH 03755
Business Address 23 SOUTH MAIN STREET SUITE 3B HANOVER NH 03755 603 640 2200
WHITE MOUNTAINS INSURANCE GROUP LTD (Filer) CIK: 0000776867 (see all company filings)

EIN.: 942708455 | State of Incorp.: D0 | Fiscal Year End: 1231
Type: 8-K | Act: 34 | File No.: 001-08993 | Film No.: 251374162
SIC: 6331 Fire, Marine & Casualty Insurance
(CF Office: 02 Finance)