Credit Suisse (CS) has won a small victory in a legal battle over its sale of mortgage-backed securities.

The U.S. Court of Appeals for the 2nd Circuit on Monday agreed to hear an interim appeal by the bank, which contends that a trial judge erred when he certified the class of plaintiffs in the suit as anyone who invested in 26 separate groups of securities backed by residential loans that Credit Suisse underwrote in 2006.

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