White Mountains Insurance Group LTD 13F holdings
White Mountains Insurance Group LTD reported 2 positions with a total reported value of $393.6M as of 2026-06-30, in its 13F for Q2 2026, filed 2026-08-12. Top holdings by reported value: MAX MEDIAALPHA INC (57.0%), SPY SPDR S&P 500 ETF TR (43.0%). Against 2026-03-31 it opened 0 new positions and exited 0. Next 13F due by 2026-11-14, the legal deadline 45 days after the quarter ending 2026-09-30.
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Top holdings
2 largest of 2 positions · reported value as of 2026-06-30
| Holding | Shares | Reported value | % of portfolio |
|---|---|---|---|
| MAX MEDIAALPHA INC | 17,856,614 | $224.5M | 57.0% |
| SPY SPDR S&P 500 ETF TR | 226,500 | $169.1M | 43.0% |
SEC FORM 13F · Q2 2026 · VALUES AS REPORTED, NOT PRICES
New positions this quarter
Held at 2026-06-30, not at 2026-03-31 · 0 in all · reported value as of 2026-06-30
No new positions.
Sold out
Held at 2026-03-31, gone by 2026-06-30 · 0 in all · reported value as of 2026-03-31
No positions were sold out.
Biggest increases and decreases
Positions held at both quarter ends, by change in shares · reported value as of 2026-06-30
Increases
No position was increased.
Decreases
No position was decreased.
CIK 776867 · 13F FILINGS ON EDGAR · INFORMATIONAL ONLY
