Filed: 5/12/2026ACC: 0001104659-26-059351
📋 What this filing means
WHITE MOUNTAINS INSURANCE GROUP LTD filed this quarterly 13F‑HR report disclosing 2 equity positions with a total reported market value of $313.37M. This filing provides a transparent view of the manager's long equity holdings as of the quarter end.
2
Positions
$313.37M
Total AUM (reported)
18.08M
Total Shares
Allocation by class
CL A$166.07M53.0%
TR UNIT$147.30M47.0%
Portfolio Concentration
Top 3$313.37M100.0%
Top 3 weight
100.0%
Top 10 weight
100.0%
Voting Authority Distribution
Total shares with voting rights: 18.08M
Sole
Full voting authority
18.08M
shares
% of voting shares100.0%
Shared
Joint voting authority
0.00
shares
% of voting shares0.0%
None
No voting authority
0.00
shares
% of voting shares0.0%
Investment Discretion (by position count)
Sole2
Shared0
Other0
Dominant voting typeSole · 100.0% of voting shares
Institutional Holdings2
Rows:
MEDIAALPHA INC
SOLEShares17.86M
TypeSH
Market value$166.07M
52.99%
Sole
17.86M
Shared
0.00
None
0.00
SPDR S&P 500 ETF TR
SOLEShares226.50K
TypeSH
Market value$147.30M
47.01%
Sole
226.50K
Shared
0.00
None
0.00
| Issuer | Class | Shares | Type | Value / Portfolio % | Voting — Sole | Shared | None |
|---|---|---|---|---|---|---|---|
MEDIAALPHA INCSOLE | CL A | 17.86M | SH | $166.07M 52.99% | 17.86M | 0.00 | 0.00 |
SPDR S&P 500 ETF TRSOLE | TR UNIT | 226.50K | SH | $147.30M 47.01% | 226.50K | 0.00 | 0.00 |