WHITE MOUNTAINS INSURANCE GROUP LTD - Stock Holdings in 13F Filings (SEC)

Updated on March 15, 2026.

Based on 13F Filings filed with the SEC on February 12, 2026, for the 2025 Q4 period, WHITE MOUNTAINS INSURANCE GROUP LTD held in its portfolio 2 assets valued at $261,929,551 (i.e. $261.93M).

The most valuable assets in the portfolio included: MEDIAALPHA INC ($231.24M), and SPDR S&P 500 ETF TR ($30.69M),

The chart below shows the top 2 valuable assets, and the table below shows the top 2 valuable assets.

You can see similar for other investment managers.

Related Topics: SEC Topic List.

Data Source: SEC.

Top Valuable Stocks in WHITE MOUNTAINS INSURANCE GROUP LTD Portfolio

MEDIAALPHA INC

SPDR S&P 500 ETF TR

WHITE MOUNTAINS INSURANCE GROUP LTD - Stock Holdings in 13F Filings (SEC)

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Name of Issuer	No. of Shares	Value ($)	Class
MEDIAALPHA INC	17856614	231243151	CL A
SPDR S&P 500 ETF TR	45000	30686400	TR UNIT