# WHITE MOUNTAINS INSURANCE GROUP LTD: Form 13F holdings

An institutional investment manager in Hanover, NH. SEC CIK 776867.

- Quarter ended: 2026-06-30
- Filed: 2026-08-12
- Reported value: $393.6m
- Positions: 2 (2 lines in the filing's table; lines for the same security and option type are added together here)
- Compared with: the 13F for the quarter ended 2026-03-31
- Filing: https://www.sec.gov/Archives/edgar/data/776867/000110465926094905/

## Holdings

As filed, largest first. Reported value is what the manager stated at the quarter end (Jun 30, 2026), in US dollars; it is filing data, not a price. Weight is the share of the total reported value.

| Issuer | Class | Reported value | Weight | Shares | Put or call | Change on the quarter before |
| --- | --- | ---: | ---: | ---: | --- | --- |
| [MEDIAALPHA INC (MAX)](/companies/max.md) | CL A | $224.5m | 57.0% | 17,856,614 |  | Unchanged |
| [SPDR S&P 500 ETF TR (SPY)](/companies/spy.md) | TR UNIT | $169.1m | 43.0% | 226,500 |  | Unchanged |

Source: SEC EDGAR, Form 13F-HR, accession 0001104659-26-094905. Last ingested by Listed: Oct 22, 2026, 05:26 ET. No prices; not investment advice.