0001104659-26-059351.txt : 20260512 0001104659-26-059351.hdr.sgml : 20260512 20260512160106 ACCESSION NUMBER: 0001104659-26-059351 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20260331 FILED AS OF DATE: 20260512 DATE AS OF CHANGE: 20260512 EFFECTIVENESS DATE: 20260512 FILER: COMPANY DATA: COMPANY CONFORMED NAME: WHITE MOUNTAINS INSURANCE GROUP LTD CENTRAL INDEX KEY: 0000776867 STANDARD INDUSTRIAL CLASSIFICATION: FIRE, MARINE & CASUALTY INSURANCE [6331] ORGANIZATION NAME: 02 Finance EIN: 942708455 STATE OF INCORPORATION: D0 FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 13F-HR SEC ACT: 1934 Act SEC FILE NUMBER: 028-01681 FILM NUMBER: 26968273 BUSINESS ADDRESS: STREET 1: 23 SOUTH MAIN STREET STREET 2: SUITE 3B CITY: HANOVER STATE: NH ZIP: 03755 BUSINESS PHONE: 603 640 2200 MAIL ADDRESS: STREET 1: 23 SOUTH MAIN STREET STREET 2: SUITE 3B CITY: HANOVER STATE: NH ZIP: 03755 FORMER COMPANY: FORMER CONFORMED NAME: WHITE MOUNTAINS INSURANCE GROUP INC DATE OF NAME CHANGE: 19990603 FORMER COMPANY: FORMER CONFORMED NAME: FUND AMERICAN ENTERPRISES HOLDINGS INC DATE OF NAME CHANGE: 19920703 FORMER COMPANY: FORMER CONFORMED NAME: FUND AMERICAN COMPANIES INC DATE OF NAME CHANGE: 19920701 13F-HR 1 primary_doc.xml X0202 13F-HR LIVE false false false 0000776867 XXXXXXXX 03-31-2026 03-31-2026 false WHITE MOUNTAINS INSURANCE GROUP LTD

23 SOUTH MAIN STREET SUITE 3B HANOVER NH 03755

13F HOLDINGS REPORT 028-01681 N Michaela J. Hildreth 603-640-2200 /s/ Michaela J. Hildreth Boston MA 05-12-2026 0 2 313368520 INFORMATION TABLE 2 infotable.xml MEDIAALPHA INC CL A 58450V104 BBG00XRTJ7K6 166066510 17856614 SH SOLE 17856614 0 0 SPDR S&P 500 ETF TR TR UNIT 78462F103 BBG000BDTBL9 147302010 226500 SH SOLE 226500 0 0