White Mountains Insurance Group Ltd
At a glance: White Mountains Insurance Group Ltd is 10% Owner at MediaAlpha (MAX). Their latest SEC Form 4, filed Nov 13, 2026, reported a sale of $16.0M. On file: 0 purchase lines ($0) and 2 sale lines ($92.4M).
Disclosed holdings: about $165M of MAX stock: 11,226,223 shares (including shares held indirectly, e.g. through a trust or fund) reported on its latest Form 4 (filed Nov 13, 2026), valued at the Nov 13, 2026 close of $14.71. This counts only MAX shares reported to the SEC; it leaves out cash, other investments, options and unvested awards, so it is not total net worth.
10% Owner at MediaAlpha, Inc. (MAX)
Purchase track record
Not enough history. Based on 0 purchases with a full 90 days of price history.
Reported trades
| Filed | Stock | Type | Shares | Price | Value | Since |
|---|---|---|---|---|---|---|
| Nov 13 NewSEC | MAXMediaAlpha, Inc. | Sell | 1,130,00011,226,223 held (−9%) | $14.15 | $16.0M | +4.0% |
| Nov 5SEC | MAXMediaAlpha, Inc. | Sell | 5,500,39112,356,223 held (−31%) | $13.90 | $76.5M | +5.8% |
- Sell
10% Owner Mountains Insurance Group Ltd White sold $76.5M of MAX at $13.90 — cuts the stake by 31%.
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