Radian Group, Philadelphia lost $1.1 billion for the fourth quarter and $1.9 billion for 2010 as the company took a non-cash charge of $841.5 million to establish a valuation allowance against substantially the company's entire net deferred tax assets.

The results also include a pre-tax loss from the change in fair value of derivatives of $185.9 million for the quarter and $558.7 million for the year.

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