10-QAccepted Aug 6, 8:50 AM ET

WHITE MOUNTAINS INSURANCE GROUP LTD 10-Q

WTMWHITE MOUNTAINS INSURANCE GROUP LTD

sec.gov View full filing

Accepted (ET)

8:50 AM

Aug 6, 2026

Filed

Aug 6, 2026

Documents

121

Size

23.2 MB

Summary

Summary not available

This filing does not have a written summary yet. You can still open the original filing and its exhibits.

Filing details

Company: WHITE MOUNTAINS INSURANCE GROUP LTD
Ticker: WTM
CIK: 0000776867
Form: 10-Q
Accepted: Aug 6, 8:50 AM ET
Filed: Aug 6, 2026
Size: 23.2 MB
Accession: 0001628280-26-053932

Documents · 121

wtm-20260630.htmPrimary
10-Q
wtmq22026ex311.htm
EX-31.1
wtmq22026ex312.htm
EX-31.2
wtmq22026ex321.htm
EX-32.1
wtmq22026ex322.htm
EX-32.2
wtm-20260630.xsd
XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
wtm-20260630_cal.xml
XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT
wtm-20260630_def.xml
XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT
wtm-20260630_lab.xml
XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
wtm-20260630_pre.xml
XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
R1.htm
IDEA: XBRL DOCUMENT
R2.htm
IDEA: XBRL DOCUMENT
R3.htm
IDEA: XBRL DOCUMENT
R4.htm
IDEA: XBRL DOCUMENT
R5.htm
IDEA: XBRL DOCUMENT
R6.htm
IDEA: XBRL DOCUMENT
R7.htm
IDEA: XBRL DOCUMENT
R8.htm
IDEA: XBRL DOCUMENT
R9.htm
IDEA: XBRL DOCUMENT
R10.htm
IDEA: XBRL DOCUMENT
R11.htm
IDEA: XBRL DOCUMENT
R12.htm
IDEA: XBRL DOCUMENT
R13.htm
IDEA: XBRL DOCUMENT
R14.htm
IDEA: XBRL DOCUMENT
R15.htm
IDEA: XBRL DOCUMENT
R16.htm
IDEA: XBRL DOCUMENT
R17.htm
IDEA: XBRL DOCUMENT
R18.htm
IDEA: XBRL DOCUMENT
R19.htm
IDEA: XBRL DOCUMENT
R20.htm
IDEA: XBRL DOCUMENT
R21.htm
IDEA: XBRL DOCUMENT
R22.htm
IDEA: XBRL DOCUMENT
R23.htm
IDEA: XBRL DOCUMENT
R24.htm
IDEA: XBRL DOCUMENT
R25.htm
IDEA: XBRL DOCUMENT
R26.htm
IDEA: XBRL DOCUMENT
R27.htm
IDEA: XBRL DOCUMENT
R28.htm
IDEA: XBRL DOCUMENT
R29.htm
IDEA: XBRL DOCUMENT
R30.htm
IDEA: XBRL DOCUMENT
R31.htm
IDEA: XBRL DOCUMENT
R32.htm
IDEA: XBRL DOCUMENT
R33.htm
IDEA: XBRL DOCUMENT
R34.htm
IDEA: XBRL DOCUMENT
R35.htm
IDEA: XBRL DOCUMENT
R36.htm
IDEA: XBRL DOCUMENT
R37.htm
IDEA: XBRL DOCUMENT
R38.htm
IDEA: XBRL DOCUMENT
R39.htm
IDEA: XBRL DOCUMENT
R40.htm
IDEA: XBRL DOCUMENT
R41.htm
IDEA: XBRL DOCUMENT
R42.htm
IDEA: XBRL DOCUMENT
R43.htm
IDEA: XBRL DOCUMENT
R44.htm
IDEA: XBRL DOCUMENT
R45.htm
IDEA: XBRL DOCUMENT
R46.htm
IDEA: XBRL DOCUMENT
R47.htm
IDEA: XBRL DOCUMENT
R48.htm
IDEA: XBRL DOCUMENT
R49.htm
IDEA: XBRL DOCUMENT
R50.htm
IDEA: XBRL DOCUMENT
R51.htm
IDEA: XBRL DOCUMENT
R52.htm
IDEA: XBRL DOCUMENT
R53.htm
IDEA: XBRL DOCUMENT
R54.htm
IDEA: XBRL DOCUMENT
R55.htm
IDEA: XBRL DOCUMENT
R56.htm
IDEA: XBRL DOCUMENT
R57.htm
IDEA: XBRL DOCUMENT
R58.htm
IDEA: XBRL DOCUMENT
R59.htm
IDEA: XBRL DOCUMENT
R60.htm
IDEA: XBRL DOCUMENT
R61.htm
IDEA: XBRL DOCUMENT
R62.htm
IDEA: XBRL DOCUMENT
R63.htm
IDEA: XBRL DOCUMENT
R64.htm
IDEA: XBRL DOCUMENT
R65.htm
IDEA: XBRL DOCUMENT
R66.htm
IDEA: XBRL DOCUMENT
R67.htm
IDEA: XBRL DOCUMENT
R68.htm
IDEA: XBRL DOCUMENT
R69.htm
IDEA: XBRL DOCUMENT
R70.htm
IDEA: XBRL DOCUMENT
R71.htm
IDEA: XBRL DOCUMENT
R72.htm
IDEA: XBRL DOCUMENT
R73.htm
IDEA: XBRL DOCUMENT
R74.htm
IDEA: XBRL DOCUMENT
R75.htm
IDEA: XBRL DOCUMENT
R76.htm
IDEA: XBRL DOCUMENT
R77.htm
IDEA: XBRL DOCUMENT
R78.htm
IDEA: XBRL DOCUMENT
R79.htm
IDEA: XBRL DOCUMENT
R80.htm
IDEA: XBRL DOCUMENT
R81.htm
IDEA: XBRL DOCUMENT
R82.htm
IDEA: XBRL DOCUMENT
R83.htm
IDEA: XBRL DOCUMENT
R84.htm
IDEA: XBRL DOCUMENT
R85.htm
IDEA: XBRL DOCUMENT
R86.htm
IDEA: XBRL DOCUMENT
R87.htm
IDEA: XBRL DOCUMENT
R88.htm
IDEA: XBRL DOCUMENT
R89.htm
IDEA: XBRL DOCUMENT
R90.htm
IDEA: XBRL DOCUMENT
R91.htm
IDEA: XBRL DOCUMENT
R92.htm
IDEA: XBRL DOCUMENT
R93.htm
IDEA: XBRL DOCUMENT
R94.htm
IDEA: XBRL DOCUMENT
R95.htm
IDEA: XBRL DOCUMENT
R96.htm
IDEA: XBRL DOCUMENT
R97.htm
IDEA: XBRL DOCUMENT
R98.htm
IDEA: XBRL DOCUMENT
R99.htm
IDEA: XBRL DOCUMENT
R100.htm
IDEA: XBRL DOCUMENT
R101.htm
IDEA: XBRL DOCUMENT
R102.htm
IDEA: XBRL DOCUMENT
R103.htm
IDEA: XBRL DOCUMENT
R104.htm
IDEA: XBRL DOCUMENT
R105.htm
IDEA: XBRL DOCUMENT
report.css
IDEA: XBRL DOCUMENT
Show.js
IDEA: XBRL DOCUMENT
FilingSummary.xml
IDEA: XBRL DOCUMENT
MetaLinks.json
IDEA: XBRL DOCUMENT
0001628280-26-053932-xbrl.zip
IDEA: XBRL DOCUMENT
wtm-20260630_htm.xml
IDEA: XBRL DOCUMENT