# Filing Detail

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)