Form 10-Q - Quarterly report [Sections 13 or 15(d)]:
SEC Accession No. 0000776867-25-000014
Filing Date
2025-08-07
Accepted
2025-08-07 08:28:42
Documents
188
Period of Report
2025-06-30

Document Format Files

Seq Description Document Type Size
1 10-Q wtm-20250630.htm   iXBRL 10-Q 4510325
2 EX-10.4 wtmexhibit104.htm EX-10.4 456290
3 EX-10.5 wtmexhibit105.htm EX-10.5 521226
4 EX-31.1 wtmq22025ex311.htm EX-31.1 8967
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6 EX-32.1 wtmq22025ex321.htm EX-32.1 6208
7 EX-32.2 wtmq22025ex322.htm EX-32.2 6149
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  Complete submission text file 0000776867-25-000014.txt   125279431

Data Files

Seq Description Document Type Size
8 XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT wtm-20250630.xsd EX-101.SCH 125644
9 XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT wtm-20250630_cal.xml EX-101.CAL 136686
10 XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT wtm-20250630_def.xml EX-101.DEF 831964
11 XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT wtm-20250630_lab.xml EX-101.LAB 1183267
12 XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT wtm-20250630_pre.xml EX-101.PRE 1007533
191 EXTRACTED XBRL INSTANCE DOCUMENT wtm-20250630_htm.xml XML 4610817
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-Q | Act: 34 | File No.: 001-08993 | Film No.: 251191782
SIC: 6331 Fire, Marine & Casualty Insurance
(CF Office: 02 Finance)