WHITE MOUNTAINS INSURANCE GROUP LTD reports

Company Names, identifiers, and filing context for this profile. 1 identity field
Company location
Hanover, NH
SEC filing record 1 source field available
Fiscal year end
31 December
WHITE MOUNTAINS INSURANCE GROUP LTD has filed 1,753 SEC EDGAR filings since 09 Feb 1994

SEC filing history

Showing 51-75 of 1,000 matching filings.

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25
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3
4

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
02 Jan 2026
Reporting date
01 Jan 2026
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SC TO-I/A File 005-36786

SC TO-I/A

Filing date
29 Dec 2025
Reporting date
Not listed
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4

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
23 Dec 2025
Reporting date
23 Dec 2025
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4/A

AMENDED STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
22 Dec 2025
Reporting date
19 Dec 2025
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4

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
22 Dec 2025
Reporting date
19 Dec 2025
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4

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
22 Dec 2025
Reporting date
19 Dec 2025
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SC TO-I/A File 005-36786

SC TO-I/A

Filing date
22 Dec 2025
Reporting date
Not listed
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4

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
16 Dec 2025
Reporting date
16 Dec 2025
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4

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
26 Nov 2025
Reporting date
25 Nov 2025
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13F-HR File 028-01681

13F-HR filing

Filing date
13 Nov 2025
Reporting date
30 Sep 2025
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4

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
10 Nov 2025
Reporting date
10 Nov 2025
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SCHEDULE 13G/A File 005-36786

SCHEDULE 13G/A filing

Filing date
07 Nov 2025
Reporting date
Not listed
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N-PX File 028-01681

N-PX filing

Filing date
27 Aug 2025
Reporting date
30 Jun 2025
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13F-HR File 028-01681

13F-HR filing

Filing date
11 Aug 2025
Reporting date
30 Jun 2025
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SCHEDULE 13D/A

SCHEDULE 13D/A filing

Filing date
08 Aug 2025
Reporting date
Not listed
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SCHEDULE 13G/A File 005-36786

SCHEDULE 13G/A filing

Filing date
07 Aug 2025
Reporting date
Not listed
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