HNC Software Inc. stock plunged almost 20% last week amid speculation about what an investor conference call would reveal — and rebounded when it turned out to be good news.

The stock slid $5.75 Wednesday, to $23.31 at the close. Then came the end-of-the-day call, in which HNC reported that Sears, Roebuck and Co., a major customer, had successfully implemented a second HNC product.

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