White Mountains Insurance Group Ltd.
In its 13F for Q2 2025 (holdings as of June 30, 2025, filed August 11, 2025), White Mountains Insurance Group Ltd. reported 1 stock position worth $195.5 million. Its top holding was Mediaalpha Class A (MAX) at 100.0% of the portfolio. Compared with Q1 2025, it sold out of 1. The biggest sale was an exit from SS SPDR S&P 500 ETF Trust-US (SPY).
- Most Recent 13F
- Q2 2026
- Location
- Hanover, NH
- CIK
- 0000776867
- Portfolio Value
- $195.5M (Q2 2025)
- SEC Filing
- 0001104659-25-076169 ↗ filed Aug 11, 2025
Holdings Value
Holdings 1 stocks · $195.5M
| MAX Mediaalpha Inc. Class A | 100.00% | 17,856,614 | $195.5M | No change |
Portfolio Sells Q1 2025 → Q2 2025
| SPY SS SPDR S&P 500 ETF Trust-US | Sold out | 0.00% | −42.30 |
Portfolio Buys Q1 2025 → Q2 2025
| None this quarter. | |||