White Mountains Insurance Group Ltd, Ten Percent Owner at Symetra Financial Corp, holds 17.86M shares in MediaAlpha (Ticker: MAX), holds 71.75M shares in Onebeacon Insurance Group (Ticker: ~OB), holds 0.00 shares in Symetra Financial Corp (Ticker: SYA). Most recently, White Mountains Insurance Group Ltd Sold ― shares of MediaAlpha on May 09, 2024 for an estimated value of 95.00M.