Banc-America Robertson Stephens & Co. said it faces a possible $5 billion judgment in a class action that alleges the brokerage colluded with other firms to rig stock prices.

The San Francisco-based brokerage, a BankAmerica Corp. unit, is the lone holdout from a landmark $1.01 billion settlement between 36 brokerages and investors who filed the suit. The complaint accuses the 37 firms of keeping trading spreads-the difference between the buying and selling price- artificially wide on 1,659 Nasdaq stocks between 1989 and 1994.

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