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)