# Filing Detail

Form 10-Q - Quarterly report [Sections 13 or 15(d)]:
SEC Accession No. 0000776867-25-000006
Filing Date
2025-05-07
Accepted
2025-05-07 08:16:40
Documents
122
Period of Report
2025-03-31

Document Format Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
1 | 10-Q | wtm-20250331.htm iXBRL | 10-Q | 3447109
2 | EX-10.1 | wtm10-q2025exhibit101.htm | EX-10.1 | 17556
3 | EX-10.2 | wtm10-q2025exhibit102.htm | EX-10.2 | 7266
4 | EX-31.1 | wtmq12025ex311.htm | EX-31.1 | 9105
5 | EX-31.2 | wtmq12025ex312.htm | EX-31.2 | 9199
6 | EX-32.1 | wtmq12025ex321.htm | EX-32.1 | 6326
7 | EX-32.2 | wtmq12025ex322.htm | EX-32.2 | 6262
13 |  | wtm10-q2025exhibit101001.jpg | GRAPHIC | 263416
14 |  | wtm10-q2025exhibit101002.jpg | GRAPHIC | 247043
15 |  | wtm10-q2025exhibit101003.jpg | GRAPHIC | 270840
16 |  | wtm10-q2025exhibit101004.jpg | GRAPHIC | 271530
17 |  | wtm10-q2025exhibit101005.jpg | GRAPHIC | 45377
18 |  | wtm10-q2025exhibit101006.jpg | GRAPHIC | 71641
19 |  | wtm10-q2025exhibit101007.jpg | GRAPHIC | 46418
20 |  | wtm10-q2025exhibit101008.jpg | GRAPHIC | 45135
| Complete submission text file | 0000776867-25-000006.txt |  | 20086609

Data Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
8 | XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT | wtm-20250331.xsd | EX-101.SCH | 120783
9 | XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT | wtm-20250331_cal.xml | EX-101.CAL | 136959
10 | XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT | wtm-20250331_def.xml | EX-101.DEF | 803002
11 | XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT | wtm-20250331_lab.xml | EX-101.LAB | 1154472
12 | XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT | wtm-20250331_pre.xml | EX-101.PRE | 977496
124 | EXTRACTED XBRL INSTANCE DOCUMENT | wtm-20250331_htm.xml | XML | 3723678

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.: 25919418
SIC: 6331 Fire, Marine & Casualty Insurance
(CF Office: 02 Finance)