Shares of Compass Bancshares of Birmingham, Ala., fell despite a rising market Tuesday as investors dumped shares because of concerns about margin compression.

Investors became jittery after Marni Pont O'Doherty, an analyst at Keefe, Bruyette & Woods Inc., said in a note to clients said that she expects Compass' margins to compress by five basis points in the first quarter and perhaps another five basis points over the course of the year.

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