White Mountains Insurance WTM SEC Filings

NYSE WTM
$2,214.19 +47.07 (+2.17%)
As of: Oct 20, 2026 · 3:59 PM EDT
EDGAR Disclosures

SEC Filings

Source SEC EDGAR

Every SEC filing White Mountains Insurance Group Ltd (WTM) has made, as reported on EDGAR — annual and quarterly reports, current reports, insider transactions and ownership disclosures. Filter by form group, form type or period, and open any filing or its index directly.

Form Type
# Form Type Form Group Accession Date Filing Index
14Insider Transaction0000776867-26-000051Aug 31, 2026 9:04 PM
24Insider Transaction0000776867-26-000049Aug 27, 2026 7:46 PM
33Insider Transaction0000776867-26-000047Aug 27, 2026 7:39 PM
48-KCurrent Report0001628280-26-059191Aug 27, 2026 12:11 PM
5N-PXOthers0001104659-26-101494Aug 26, 2026 8:13 PM
613F-HRBeneficial Ownership0001104659-26-094905Aug 12, 2026 4:21 PM
710-QQuarterly & Annual Report0001628280-26-053932Aug 6, 2026 12:50 PM
88-KCurrent Report0001628280-26-053913Aug 6, 2026 12:14 PM
911-KOthers0001628280-26-046118Jun 30, 2026 9:06 PM
108-KCurrent Report0001628280-26-041051Jun 5, 2026 12:17 PM
118-KCurrent Report0001628280-26-037284May 21, 2026 8:21 PM
128-KCurrent Report0001628280-26-035349May 15, 2026 1:02 PM
1313F-HRBeneficial Ownership Report0001104659-26-059351May 12, 2026 8:01 PM
14SCHEDULE 13GBeneficial Ownership Report0001465109-26-000020May 7, 2026 3:56 PM
15SCHEDULE 13GBeneficial Ownership Report0001465109-26-000020May 7, 2026 3:56 PM
1610-QQuarterly & Annual Report0001628280-26-030935May 6, 2026 12:31 PM
178-KCurrent Report0001628280-26-030930May 6, 2026 12:20 PM
18SCHEDULE 13DBeneficial Ownership Report0000950157-26-000566May 1, 2026 9:30 PM
19SCHEDULE 13GBeneficial Ownership Report0002100119-26-001212Apr 30, 2026 2:28 PM
208-KCurrent Report0001628280-26-022818Apr 1, 2026 4:21 PM
21ARSOthers0001104659-26-038494Apr 1, 2026 4:04 PM
22DEF 14AOthers0001104659-26-038487Apr 1, 2026 4:00 PM
23SCHEDULE 13GBeneficial Ownership Report0000102909-26-002687Mar 27, 2026 2:17 PM
244Insider Transaction0000776867-26-000025Mar 20, 2026 2:51 PM
254Insider Transaction0000776867-26-000025Mar 20, 2026 2:51 PM
264Insider Transaction0000776867-26-000025Mar 20, 2026 2:51 PM
274Insider Transaction0000776867-26-000023Mar 5, 2026 10:21 AM
284Insider Transaction0000776867-26-000023Mar 5, 2026 10:21 AM
294Insider Transaction0000776867-26-000023Mar 5, 2026 10:21 AM
304Insider Transaction0000776867-26-000021Feb 27, 2026 11:19 AM
314Insider Transaction0000776867-26-000021Feb 27, 2026 11:19 AM
324Insider Transaction0000776867-26-000021Feb 27, 2026 11:19 AM
334Insider Transaction0000776867-26-000020Feb 27, 2026 11:18 AM
344Insider Transaction0000776867-26-000020Feb 27, 2026 11:18 AM
354Insider Transaction0000776867-26-000020Feb 27, 2026 11:18 AM
364Insider Transaction0000776867-26-000019Feb 27, 2026 11:18 AM
374Insider Transaction0000776867-26-000019Feb 27, 2026 11:18 AM
384Insider Transaction0000776867-26-000019Feb 27, 2026 11:18 AM
394Insider Transaction0000776867-26-000018Feb 27, 2026 11:17 AM
404Insider Transaction0000776867-26-000018Feb 27, 2026 11:17 AM
414Insider Transaction0000776867-26-000018Feb 27, 2026 11:17 AM
424Insider Transaction0000776867-26-000017Feb 27, 2026 11:17 AM
4310-KQuarterly & Annual Report0001628280-26-012603Feb 27, 2026 9:21 AM
448-KCurrent Report0001628280-26-012417Feb 26, 2026 5:19 PM
4513F-HRBeneficial Ownership Report0001104659-26-014432Feb 12, 2026 5:26 PM
46SCHEDULE 13GBeneficial Ownership Report0000895421-26-000047Feb 12, 2026 10:38 AM
478-KCurrent Report0001628280-26-005947Feb 6, 2026 8:21 AM
48SCHEDULE 13GBeneficial Ownership Report0001465109-26-000005Feb 5, 2026 3:08 PM
498-KCurrent Report0001628280-26-001102Jan 7, 2026 8:02 AM
504Insider Transaction0000776867-26-000010Jan 5, 2026 9:09 AM
...

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