# Filing Detail

Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]:
SEC Accession No. 0000776867-25-000003
Filing Date
2025-02-28
Accepted
2025-02-28 08:47:25
Documents
158
Period of Report
2024-12-31

Document Format Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
1 | 10-K | wtm-20241231.htm iXBRL | 10-K | 7548750
2 | EX-4 | wtm10-k2024exhibit4.htm | EX-4 | 15492
3 | EX-19 | wtm10-k2024exhibit19.htm | EX-19 | 38067
4 | EX-21 | wtm10-k2024exhibit21.htm | EX-21 | 29078
5 | EX-23 | wtm10-k2024exhibit23.htm | EX-23 | 1714
6 | EX-24 | wtm10-k2024exhibit24.htm | EX-24 | 32442
7 | EX-31.1 | wtm10-k2024exhibit311.htm | EX-31.1 | 9199
8 | EX-31.2 | wtm10-k2024exhibit312.htm | EX-31.2 | 9051
9 | EX-32.1 | wtm10-k2024exhibit321.htm | EX-32.1 | 6711
10 | EX-32.2 | wtm10-k2024exhibit322.htm | EX-32.2 | 6868
16 |  | wtm-20241231_g1.jpg | GRAPHIC | 105233
| Complete submission text file | 0000776867-25-000003.txt |  | 33673831

Data Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
11 | XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT | wtm-20241231.xsd | EX-101.SCH | 172589
12 | XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT | wtm-20241231_cal.xml | EX-101.CAL | 236343
13 | XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT | wtm-20241231_def.xml | EX-101.DEF | 1177834
14 | XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT | wtm-20241231_lab.xml | EX-101.LAB | 1697862
15 | XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT | wtm-20241231_pre.xml | EX-101.PRE | 1465971
160 | EXTRACTED XBRL INSTANCE DOCUMENT | wtm-20241231_htm.xml | XML | 6995565

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: 10-K | Act: 34 | File No.: 001-08993 | Film No.: 25682949
SIC: 6331 Fire, Marine & Casualty Insurance
(CF Office: 02 Finance)