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Super Investors WHITE MOUNTAINS INSURANCE GROUP LTD
WM

WHITE MOUNTAINS INSURANCE GROUP LTD

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Portfolio value
$394M
Positions
2
Quarter ended
June 30, 2026
Filed
August 12, 2026

Reported portfolio value by quarter (34 quarters reported)

$802M $167M
Q2 13 Q1 15 Q3 21 Q2 23 Q1 25 Q2 26

$321M in Q2 2013 → $394M now. Hover for any quarter.

Holdings

As reported for the quarter ended June 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
Mediaalpha Inc 57.0% Unchanged 17,856,614 $224M
SS SPDR S&P 500 ETF Tr 43.0% Unchanged 226,500 $169M

Timeline of changes

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

Q2 2026

quarter ended June 30, 2026 · filed August 12, 2026

No position changes this quarter.

Q1 2026

quarter ended March 31, 2026 · filed May 12, 2026

Company Action Shares changed Value of change % of portfolio
SS SPDR S&P 500 ETF Tr Added +181,500 +$118M 47.0%

Q4 2025

quarter ended December 31, 2025 · filed February 12, 2026

Company Action Shares changed Value of change % of portfolio
SS SPDR S&P 500 ETF Tr New +45,000 +$30.7M 11.7%

Q3 2025

quarter ended September 30, 2025 · filed November 13, 2025

No position changes this quarter.

Q2 2025

quarter ended June 30, 2025 · filed August 11, 2025

Company Action Shares changed Value of change % of portfolio
SS SPDR S&P 500 ETF Tr Exited −216,197 −$121M —

Q1 2025

quarter ended March 31, 2025 · filed May 12, 2025

Company Action Shares changed Value of change % of portfolio
SS SPDR S&P 500 ETF Tr Trimmed −166,949 −$93.4M 42.3%

Q4 2024

quarter ended December 31, 2024 · filed February 12, 2025

No position changes this quarter.

Q3 2024

quarter ended September 30, 2024 · filed November 12, 2024

No position changes this quarter.

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