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NEW YORK ( TheStreet) -- White Mountains Insurance Group (NYSE: WTM) hit a new 52-week high Thursday as it is currently trading at $439, above its previous 52-week high of $438.48 with 5,604 shares traded as of 12 p.m. ET. Average volume has been 15,600 shares over the past 30 days. White Mountains Insurance Group has a market cap of $3.31 billion and is part of the financial sector and insurance industry. Shares are up 30.7% year to date as of the close of trading on Wednesday. White Mountains Insurance Group, Ltd., through its subsidiaries, engages in the property and casualty insurance, and reinsurance businesses. The company has a P/E ratio of 52.6, below the average insurance industry P/E ratio of 96 and above the S&P 500 P/E ratio of 17.7.