# Filing Detail

Form 8-K - Current report:
SEC Accession No. 0001628280-26-035349
Filing Date
2026-05-15
Accepted
2026-05-15 09:02:53
Documents
118
Period of Report
2026-05-14
Items
Item 1.01: Entry into a Material Definitive Agreement
Item 2.03: Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant
Item 9.01: Financial Statements and Exhibits

Document Format Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
1 | 8-K | wtm-20260514.htm iXBRL | 8-K | 24714
2 | EX-10.1 | wtm8-k2026exhibit101.htm | EX-10.1 | 353326
6 |  | wtm8-k2026exhibit101001.jpg | GRAPHIC | 44792
7 |  | wtm8-k2026exhibit101002.jpg | GRAPHIC | 199382
8 |  | wtm8-k2026exhibit101003.jpg | GRAPHIC | 211323
9 |  | wtm8-k2026exhibit101004.jpg | GRAPHIC | 182569
10 |  | wtm8-k2026exhibit101005.jpg | GRAPHIC | 116866
11 |  | wtm8-k2026exhibit101006.jpg | GRAPHIC | 77036
12 |  | wtm8-k2026exhibit101007.jpg | GRAPHIC | 168647
13 |  | wtm8-k2026exhibit101008.jpg | GRAPHIC | 236633
14 |  | wtm8-k2026exhibit101009.jpg | GRAPHIC | 284171
15 |  | wtm8-k2026exhibit101010.jpg | GRAPHIC | 268517
16 |  | wtm8-k2026exhibit101011.jpg | GRAPHIC | 283570
17 |  | wtm8-k2026exhibit101012.jpg | GRAPHIC | 291939
18 |  | wtm8-k2026exhibit101013.jpg | GRAPHIC | 286445
19 |  | wtm8-k2026exhibit101014.jpg | GRAPHIC | 294960
20 |  | wtm8-k2026exhibit101015.jpg | GRAPHIC | 282304
21 |  | wtm8-k2026exhibit101016.jpg | GRAPHIC | 301129
22 |  | wtm8-k2026exhibit101017.jpg | GRAPHIC | 276965
23 |  | wtm8-k2026exhibit101018.jpg | GRAPHIC | 252067
24 |  | wtm8-k2026exhibit101019.jpg | GRAPHIC | 257399
25 |  | wtm8-k2026exhibit101020.jpg | GRAPHIC | 278379
26 |  | wtm8-k2026exhibit101021.jpg | GRAPHIC | 253037
27 |  | wtm8-k2026exhibit101022.jpg | GRAPHIC | 301201
28 |  | wtm8-k2026exhibit101023.jpg | GRAPHIC | 248548
29 |  | wtm8-k2026exhibit101024.jpg | GRAPHIC | 260050
30 |  | wtm8-k2026exhibit101025.jpg | GRAPHIC | 264695
31 |  | wtm8-k2026exhibit101026.jpg | GRAPHIC | 262076
32 |  | wtm8-k2026exhibit101027.jpg | GRAPHIC | 267661
33 |  | wtm8-k2026exhibit101028.jpg | GRAPHIC | 267471
34 |  | wtm8-k2026exhibit101029.jpg | GRAPHIC | 320487
35 |  | wtm8-k2026exhibit101030.jpg | GRAPHIC | 320288
36 |  | wtm8-k2026exhibit101031.jpg | GRAPHIC | 300015
37 |  | wtm8-k2026exhibit101032.jpg | GRAPHIC | 277479
38 |  | wtm8-k2026exhibit101033.jpg | GRAPHIC | 291793
39 |  | wtm8-k2026exhibit101034.jpg | GRAPHIC | 305307
40 |  | wtm8-k2026exhibit101035.jpg | GRAPHIC | 295076
41 |  | wtm8-k2026exhibit101036.jpg | GRAPHIC | 257096
42 |  | wtm8-k2026exhibit101037.jpg | GRAPHIC | 276258
43 |  | wtm8-k2026exhibit101038.jpg | GRAPHIC | 309121
44 |  | wtm8-k2026exhibit101039.jpg | GRAPHIC | 246594
45 |  | wtm8-k2026exhibit101040.jpg | GRAPHIC | 289728
46 |  | wtm8-k2026exhibit101041.jpg | GRAPHIC | 237003
47 |  | wtm8-k2026exhibit101042.jpg | GRAPHIC | 206344
48 |  | wtm8-k2026exhibit101043.jpg | GRAPHIC | 241812
49 |  | wtm8-k2026exhibit101044.jpg | GRAPHIC | 284490
50 |  | wtm8-k2026exhibit101045.jpg | GRAPHIC | 260250
51 |  | wtm8-k2026exhibit101046.jpg | GRAPHIC | 206768
52 |  | wtm8-k2026exhibit101047.jpg | GRAPHIC | 243098
53 |  | wtm8-k2026exhibit101048.jpg | GRAPHIC | 280476
54 |  | wtm8-k2026exhibit101049.jpg | GRAPHIC | 305863
55 |  | wtm8-k2026exhibit101050.jpg | GRAPHIC | 258777
56 |  | wtm8-k2026exhibit101051.jpg | GRAPHIC | 281369
57 |  | wtm8-k2026exhibit101052.jpg | GRAPHIC | 296191
58 |  | wtm8-k2026exhibit101053.jpg | GRAPHIC | 255143
59 |  | wtm8-k2026exhibit101054.jpg | GRAPHIC | 285825
60 |  | wtm8-k2026exhibit101055.jpg | GRAPHIC | 278105
61 |  | wtm8-k2026exhibit101056.jpg | GRAPHIC | 304591
62 |  | wtm8-k2026exhibit101057.jpg | GRAPHIC | 282913
63 |  | wtm8-k2026exhibit101058.jpg | GRAPHIC | 297353
64 |  | wtm8-k2026exhibit101059.jpg | GRAPHIC | 268343
65 |  | wtm8-k2026exhibit101060.jpg | GRAPHIC | 310503
66 |  | wtm8-k2026exhibit101061.jpg | GRAPHIC | 279108
67 |  | wtm8-k2026exhibit101062.jpg | GRAPHIC | 271780
68 |  | wtm8-k2026exhibit101063.jpg | GRAPHIC | 251099
69 |  | wtm8-k2026exhibit101064.jpg | GRAPHIC | 257980
70 |  | wtm8-k2026exhibit101065.jpg | GRAPHIC | 335767
71 |  | wtm8-k2026exhibit101066.jpg | GRAPHIC | 277896
72 |  | wtm8-k2026exhibit101067.jpg | GRAPHIC | 314256
73 |  | wtm8-k2026exhibit101068.jpg | GRAPHIC | 293091
74 |  | wtm8-k2026exhibit101069.jpg | GRAPHIC | 294810
75 |  | wtm8-k2026exhibit101070.jpg | GRAPHIC | 58578
76 |  | wtm8-k2026exhibit101071.jpg | GRAPHIC | 69313
77 |  | wtm8-k2026exhibit101072.jpg | GRAPHIC | 52411
78 |  | wtm8-k2026exhibit101073.jpg | GRAPHIC | 51306
79 |  | wtm8-k2026exhibit101074.jpg | GRAPHIC | 73228
80 |  | wtm8-k2026exhibit101075.jpg | GRAPHIC | 45977
81 |  | wtm8-k2026exhibit101076.jpg | GRAPHIC | 53578
82 |  | wtm8-k2026exhibit101077.jpg | GRAPHIC | 64180
83 |  | wtm8-k2026exhibit101078.jpg | GRAPHIC | 253703
84 |  | wtm8-k2026exhibit101079.jpg | GRAPHIC | 243262
85 |  | wtm8-k2026exhibit101080.jpg | GRAPHIC | 225549
86 |  | wtm8-k2026exhibit101081.jpg | GRAPHIC | 204303
87 |  | wtm8-k2026exhibit101082.jpg | GRAPHIC | 245916
88 |  | wtm8-k2026exhibit101083.jpg | GRAPHIC | 276705
89 |  | wtm8-k2026exhibit101084.jpg | GRAPHIC | 259984
90 |  | wtm8-k2026exhibit101085.jpg | GRAPHIC | 243062
91 |  | wtm8-k2026exhibit101086.jpg | GRAPHIC | 240814
92 |  | wtm8-k2026exhibit101087.jpg | GRAPHIC | 289912
93 |  | wtm8-k2026exhibit101088.jpg | GRAPHIC | 195188
94 |  | wtm8-k2026exhibit101089.jpg | GRAPHIC | 268871
95 |  | wtm8-k2026exhibit101090.jpg | GRAPHIC | 239530
96 |  | wtm8-k2026exhibit101091.jpg | GRAPHIC | 232526
97 |  | wtm8-k2026exhibit101092.jpg | GRAPHIC | 174592
98 |  | wtm8-k2026exhibit101093.jpg | GRAPHIC | 217996
99 |  | wtm8-k2026exhibit101094.jpg | GRAPHIC | 237144
100 |  | wtm8-k2026exhibit101095.jpg | GRAPHIC | 173381
101 |  | wtm8-k2026exhibit101096.jpg | GRAPHIC | 255412
102 |  | wtm8-k2026exhibit101097.jpg | GRAPHIC | 222673
103 |  | wtm8-k2026exhibit101098.jpg | GRAPHIC | 248782
104 |  | wtm8-k2026exhibit101099.jpg | GRAPHIC | 243193
105 |  | wtm8-k2026exhibit101100.jpg | GRAPHIC | 203449
106 |  | wtm8-k2026exhibit101101.jpg | GRAPHIC | 242188
107 |  | wtm8-k2026exhibit101102.jpg | GRAPHIC | 267886
108 |  | wtm8-k2026exhibit101103.jpg | GRAPHIC | 240635
109 |  | wtm8-k2026exhibit101104.jpg | GRAPHIC | 74470
110 |  | wtm8-k2026exhibit101105.jpg | GRAPHIC | 236667
111 |  | wtm8-k2026exhibit101106.jpg | GRAPHIC | 97730
| Complete submission text file | 0001628280-26-035349.txt |  | 35320737

Data Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
3 | XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT | wtm-20260514.xsd | EX-101.SCH | 1872
4 | XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT | wtm-20260514_lab.xml | EX-101.LAB | 21629
5 | XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT | wtm-20260514_pre.xml | EX-101.PRE | 12590
122 | EXTRACTED XBRL INSTANCE DOCUMENT | wtm-20260514_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.: 26982799
SIC: 6331 Fire, Marine & Casualty Insurance
(CF Office: 02 Finance)