WHITE MOUNTAINS INSURANCE GROUP LTD
InsuranceCIK
776867
Location
HANOVER, NH
Portfolio Value
Small
$393,601,042
Diversification
Highly concentrated
Filing Date
Global Rank
#4,443
/ 8,795
▼ 55
· as of Jun 2026
Top Industry
Internet Content & Information
100.0%
3Y Alpha vs SPY
-15.1%
Period ended 3 months ago
Filed Aug 12, 2026 · 55d
23 quarters · since Dec 2020
Clone Performance
Build a hypothetical price-return history from this filer's public 13F holdings.
View clone backtestPortfolio Concentration
2 tracked positions · as of Jun 30, 2026 · Δ vs Mar 31, 2026Top Position
57.0%
+4.0 pts
Top 5
100.0%
0.0 pts
Top 10
100.0%
0.0 pts
HHI
5,099
Highly concentrated+81
Portfolio Trend
23 quarters · across all stocks
Sector Breakdown
As of Jun 30, 2026| Sector | % Portfolio | Value |
|---|---|---|
| Communication Services | 57.0% | $224,457,637 |
| Unclassified | 43.0% | $169,143,405 |
Last Quarter's Activity
Export CSVAdded To
Positions the filer increasedNo qualifying positions this quarter.
Trimmed
Positions the filer reducedNo qualifying positions this quarter.
New Positions
Positions the filer opened this quarterNo qualifying positions this quarter.
Sold Out
Positions the filer fully exitedNo qualifying positions this quarter.
2 tracked positions ·
$393,601,042 total
· filing declares
2 positions · $393,601,043
· as of Jun 30, 2026
| Ticker | Company | Type | Shares | Value (USD) | % of Portfolio | History |
|---|---|---|---|---|---|---|
| MAX |
MediaAlpha, Inc.
Communication Services
|
Held | 17,856,614 | $224,457,637 | 57.03% | |
| SPY |
Spdr S&P 500 ETF Trust
|
Held | 226,500 | $169,143,405 | 42.97% |
Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.