Deutsche Bank AG, Germany's biggest banking company, posted a fourth straight quarterly profit, buoyed by a tax gain, and it said that 2010 had gotten off to a "promising" start as trading rebounded in January.

The Frankfurt company had net income of $1.8 billion, or $2.78 share, in the fourth quarter after a loss of nearly $6.7 billion, or $12.11, a year earlier, it said in a statement Thursday. Earnings were bolstered by a tax benefit of about $770 million.

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