Based on the 2Q 10Q, I calculate book value per share at $27.80, which includes an NOL per share of $4.73.
From the 10Q:
As a result, the Company was able to conclude that it is more likely than not that it will have future taxable income sufficient to realize a significant portion of the Company’s net deferred tax asset; accordingly, $1,157,111,000 of the deferred tax valuation allowance was reversed as a credit to income tax expense on December 31, 2010.
and
In addition to the reversal of deferred tax liabilities related to unrealized gains, the Company will need to generate approximately $4,000,000,000 of future U.S. pre-tax income to fully realize its net deferred tax asset.