SEC Form 13F

WHITE MOUNTAINS INSURANCE GROUP LTD 13F Holdings

Inspect WHITE MOUNTAINS INSURANCE GROUP LTD's 2026-06-30 SEC 13F positions, public filing date, amendments and original receipt.

As of 2026-08-13T03:59:59.999Z

Report period
2026-06-30
Publicly available
2026-08-13
Reported value
$393,601,043
Positions
2

Disclosed positions

MEDIAALPHA INCMAXCL A$224,457,63817,856,614SHNone
SPDR S&P 500 ETF TRSPYTR UNIT$169,143,405226,500SHNone

Largest 50 positions by reported value; the filing may contain more positions.

How amendments affect these holdings

This view uses 1 effective filing version(s). A restatement replaces the previous book; a new-holdings amendment adds positions. 0 positions lack a resolved ticker and 0 positions are put or call entries.

A 13F is a delayed quarterly snapshot of disclosed holdings. It is not a complete trade ledger and does not reveal every position in a manager's portfolio. Option values refer to the reported underlying position rather than a traded option premium.

Quarter end and public filing date

Use the filing's public availability date when constructing a historical observation. The quarter-end report period is earlier and cannot be substituted for when the public learned the holdings.