# Filing Detail

Form 8-K - Current report:
SEC Accession No. 0000776867-25-000011
Filing Date
2025-07-16
Accepted
2025-07-16 16:29:11
Documents
130
Period of Report
2025-07-16
Items
Item 8.01: Other Events
Item 9.01: Financial Statements and Exhibits

Document Format Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
1 | 8-K | wtm-20250716.htm iXBRL | 8-K | 37810
2 | EX-10.1 | wtmex1012025whitemountai.htm | EX-10.1 | 450387
6 |  | wtmex1012025whitemountai001.jpg | GRAPHIC | 55795
7 |  | wtmex1012025whitemountai002.jpg | GRAPHIC | 162131
8 |  | wtmex1012025whitemountai003.jpg | GRAPHIC | 175799
9 |  | wtmex1012025whitemountai004.jpg | GRAPHIC | 181930
10 |  | wtmex1012025whitemountai005.jpg | GRAPHIC | 40589
11 |  | wtmex1012025whitemountai006.jpg | GRAPHIC | 88339
12 |  | wtmex1012025whitemountai007.jpg | GRAPHIC | 200143
13 |  | wtmex1012025whitemountai008.jpg | GRAPHIC | 200001
14 |  | wtmex1012025whitemountai009.jpg | GRAPHIC | 257817
15 |  | wtmex1012025whitemountai010.jpg | GRAPHIC | 269978
16 |  | wtmex1012025whitemountai011.jpg | GRAPHIC | 279890
17 |  | wtmex1012025whitemountai012.jpg | GRAPHIC | 255544
18 |  | wtmex1012025whitemountai013.jpg | GRAPHIC | 234867
19 |  | wtmex1012025whitemountai014.jpg | GRAPHIC | 281053
20 |  | wtmex1012025whitemountai015.jpg | GRAPHIC | 273943
21 |  | wtmex1012025whitemountai016.jpg | GRAPHIC | 225298
22 |  | wtmex1012025whitemountai017.jpg | GRAPHIC | 245174
23 |  | wtmex1012025whitemountai018.jpg | GRAPHIC | 241298
24 |  | wtmex1012025whitemountai019.jpg | GRAPHIC | 287857
25 |  | wtmex1012025whitemountai020.jpg | GRAPHIC | 207564
26 |  | wtmex1012025whitemountai021.jpg | GRAPHIC | 272645
27 |  | wtmex1012025whitemountai022.jpg | GRAPHIC | 235937
28 |  | wtmex1012025whitemountai023.jpg | GRAPHIC | 248673
29 |  | wtmex1012025whitemountai024.jpg | GRAPHIC | 257891
30 |  | wtmex1012025whitemountai025.jpg | GRAPHIC | 251447
31 |  | wtmex1012025whitemountai026.jpg | GRAPHIC | 252460
32 |  | wtmex1012025whitemountai027.jpg | GRAPHIC | 196975
33 |  | wtmex1012025whitemountai028.jpg | GRAPHIC | 247531
34 |  | wtmex1012025whitemountai029.jpg | GRAPHIC | 213161
35 |  | wtmex1012025whitemountai030.jpg | GRAPHIC | 197504
36 |  | wtmex1012025whitemountai031.jpg | GRAPHIC | 235572
37 |  | wtmex1012025whitemountai032.jpg | GRAPHIC | 212582
38 |  | wtmex1012025whitemountai033.jpg | GRAPHIC | 229664
39 |  | wtmex1012025whitemountai034.jpg | GRAPHIC | 223688
40 |  | wtmex1012025whitemountai035.jpg | GRAPHIC | 268706
41 |  | wtmex1012025whitemountai036.jpg | GRAPHIC | 236433
42 |  | wtmex1012025whitemountai037.jpg | GRAPHIC | 307428
43 |  | wtmex1012025whitemountai038.jpg | GRAPHIC | 327757
44 |  | wtmex1012025whitemountai039.jpg | GRAPHIC | 278817
45 |  | wtmex1012025whitemountai040.jpg | GRAPHIC | 276248
46 |  | wtmex1012025whitemountai041.jpg | GRAPHIC | 280303
47 |  | wtmex1012025whitemountai042.jpg | GRAPHIC | 273930
48 |  | wtmex1012025whitemountai043.jpg | GRAPHIC | 238707
49 |  | wtmex1012025whitemountai044.jpg | GRAPHIC | 270603
50 |  | wtmex1012025whitemountai045.jpg | GRAPHIC | 289704
51 |  | wtmex1012025whitemountai046.jpg | GRAPHIC | 292131
52 |  | wtmex1012025whitemountai047.jpg | GRAPHIC | 260537
53 |  | wtmex1012025whitemountai048.jpg | GRAPHIC | 285705
54 |  | wtmex1012025whitemountai049.jpg | GRAPHIC | 279502
55 |  | wtmex1012025whitemountai050.jpg | GRAPHIC | 262845
56 |  | wtmex1012025whitemountai051.jpg | GRAPHIC | 305384
57 |  | wtmex1012025whitemountai052.jpg | GRAPHIC | 293167
58 |  | wtmex1012025whitemountai053.jpg | GRAPHIC | 255822
59 |  | wtmex1012025whitemountai054.jpg | GRAPHIC | 241940
60 |  | wtmex1012025whitemountai055.jpg | GRAPHIC | 264705
61 |  | wtmex1012025whitemountai056.jpg | GRAPHIC | 312087
62 |  | wtmex1012025whitemountai057.jpg | GRAPHIC | 306077
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65 |  | wtmex1012025whitemountai060.jpg | GRAPHIC | 303477
66 |  | wtmex1012025whitemountai061.jpg | GRAPHIC | 273108
67 |  | wtmex1012025whitemountai062.jpg | GRAPHIC | 277094
68 |  | wtmex1012025whitemountai063.jpg | GRAPHIC | 300064
69 |  | wtmex1012025whitemountai064.jpg | GRAPHIC | 316747
70 |  | wtmex1012025whitemountai065.jpg | GRAPHIC | 305533
71 |  | wtmex1012025whitemountai066.jpg | GRAPHIC | 320204
72 |  | wtmex1012025whitemountai067.jpg | GRAPHIC | 297112
73 |  | wtmex1012025whitemountai068.jpg | GRAPHIC | 313322
74 |  | wtmex1012025whitemountai069.jpg | GRAPHIC | 304163
75 |  | wtmex1012025whitemountai070.jpg | GRAPHIC | 262961
76 |  | wtmex1012025whitemountai071.jpg | GRAPHIC | 262238
77 |  | wtmex1012025whitemountai072.jpg | GRAPHIC | 277763
78 |  | wtmex1012025whitemountai073.jpg | GRAPHIC | 246283
79 |  | wtmex1012025whitemountai074.jpg | GRAPHIC | 244424
80 |  | wtmex1012025whitemountai075.jpg | GRAPHIC | 272433
81 |  | wtmex1012025whitemountai076.jpg | GRAPHIC | 248802
82 |  | wtmex1012025whitemountai077.jpg | GRAPHIC | 261680
83 |  | wtmex1012025whitemountai078.jpg | GRAPHIC | 220847
84 |  | wtmex1012025whitemountai079.jpg | GRAPHIC | 254810
85 |  | wtmex1012025whitemountai080.jpg | GRAPHIC | 224119
86 |  | wtmex1012025whitemountai081.jpg | GRAPHIC | 269191
87 |  | wtmex1012025whitemountai082.jpg | GRAPHIC | 231901
88 |  | wtmex1012025whitemountai083.jpg | GRAPHIC | 252030
89 |  | wtmex1012025whitemountai084.jpg | GRAPHIC | 243570
90 |  | wtmex1012025whitemountai085.jpg | GRAPHIC | 290389
91 |  | wtmex1012025whitemountai086.jpg | GRAPHIC | 274083
92 |  | wtmex1012025whitemountai087.jpg | GRAPHIC | 269116
93 |  | wtmex1012025whitemountai088.jpg | GRAPHIC | 285800
94 |  | wtmex1012025whitemountai089.jpg | GRAPHIC | 296610
95 |  | wtmex1012025whitemountai090.jpg | GRAPHIC | 316645
96 |  | wtmex1012025whitemountai091.jpg | GRAPHIC | 293612
97 |  | wtmex1012025whitemountai092.jpg | GRAPHIC | 249676
98 |  | wtmex1012025whitemountai093.jpg | GRAPHIC | 265283
99 |  | wtmex1012025whitemountai094.jpg | GRAPHIC | 249571
100 |  | wtmex1012025whitemountai095.jpg | GRAPHIC | 318498
101 |  | wtmex1012025whitemountai096.jpg | GRAPHIC | 251778
102 |  | wtmex1012025whitemountai097.jpg | GRAPHIC | 298416
103 |  | wtmex1012025whitemountai098.jpg | GRAPHIC | 316844
104 |  | wtmex1012025whitemountai099.jpg | GRAPHIC | 286353
105 |  | wtmex1012025whitemountai100.jpg | GRAPHIC | 212744
106 |  | wtmex1012025whitemountai101.jpg | GRAPHIC | 290433
107 |  | wtmex1012025whitemountai102.jpg | GRAPHIC | 302265
108 |  | wtmex1012025whitemountai103.jpg | GRAPHIC | 290456
109 |  | wtmex1012025whitemountai104.jpg | GRAPHIC | 331340
110 |  | wtmex1012025whitemountai105.jpg | GRAPHIC | 286295
111 |  | wtmex1012025whitemountai106.jpg | GRAPHIC | 301502
112 |  | wtmex1012025whitemountai107.jpg | GRAPHIC | 305514
113 |  | wtmex1012025whitemountai108.jpg | GRAPHIC | 274893
114 |  | wtmex1012025whitemountai109.jpg | GRAPHIC | 296580
115 |  | wtmex1012025whitemountai110.jpg | GRAPHIC | 138618
116 |  | wtmex1012025whitemountai111.jpg | GRAPHIC | 70770
117 |  | wtmex1012025whitemountai112.jpg | GRAPHIC | 36519
118 |  | wtmex1012025whitemountai113.jpg | GRAPHIC | 39268
119 |  | wtmex1012025whitemountai114.jpg | GRAPHIC | 36847
120 |  | wtmex1012025whitemountai115.jpg | GRAPHIC | 44566
121 |  | wtmex1012025whitemountai116.jpg | GRAPHIC | 36803
122 |  | wtmex1012025whitemountai117.jpg | GRAPHIC | 37749
| Complete submission text file | 0000776867-25-000011.txt |  | 40387710

Data Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
3 | XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT | wtm-20250716.xsd | EX-101.SCH | 1872
4 | XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT | wtm-20250716_lab.xml | EX-101.LAB | 21629
5 | XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT | wtm-20250716_pre.xml | EX-101.PRE | 12590
133 | EXTRACTED XBRL INSTANCE DOCUMENT | wtm-20250716_htm.xml | XML | 3656

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.: 251127740
SIC: 6331 Fire, Marine & Casualty Insurance
(CF Office: 02 Finance)