WHITE MOUNTAINS INSURANCE GROUP LTD

CIK 0000776867 • 6 13F filings • May 12, 2025 – Aug 12, 2026

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Filer information

Filed by: WHITE MOUNTAINS INSURANCE GROUP LTD, Managing Director and Chief Accounting Officer
Address: 23 SOUTH MAIN STREET, SUITE 3B, HANOVER, NH, 03755
Phone: 603-640-2200
AUM: $261.9M

$393.6M latest

Past 5 quarters

Q4 2025

Q3 2025

Q2 2026

Q2 2025

Q1 2026

Other

Portfolio value: $261.9M2 positionsView on SEC.gov

			% of Portfolio
MEDIAALPHA INC	CL A	$231.2M	88.3%Prev: 100.0%	17,856,614 SH	Increased
SPDR S&P 500 ETF TR	TR UNIT	$30.7M	11.7%	45,000 SH	New

Open a filing on Jive Data

Filing Date	Quarter	Form	Accession	Portfolio	Filing
Feb 12, 2026	Q4 2025	13F-HR	0001104659-26-014432	$261.9M	View
Nov 13, 2025	Q3 2025	13F-HR	0001104659-25-110906	$203.2M	View
Aug 12, 2026	Q2 2026