Software vendor S1 Corp. said last week that its first-quarter earnings were generally favorable, but investors seemed more fixated on the its loss of 35 cents per share, which was higher than the consensus estimate of 23 cents.

S1's stock price dropped 30% on Wednesday, the day of the earnings announcement, to $41.50, and the stock closed Friday at $44, down 19% for the week and 69% from its 52-week high of $142.25.

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