Today's Tech Winners and Losers

Shares of Radware(RDWR Quote) were among technology's losers Monday, slumping 12% after the software maker slashed its first-quarter estimates.

The company expects to report earnings of 7 cents a share on revenue of $20 million. Previously, the company predicted earnings of 13 cents a share and revenue of $22.2 million to $22.6 million. Analysts polled by Thomson First Call project earnings of 13 cents a share on revenue of $22.3 million. The Israel-based company attributed the revision to lower-than-expected sales in the U.S. Shares were trading down $2.18 to $15.45.

Another Israeli company, Radcom(RDCM Quote), cut its first-quarter revenue forecast, sending shares down 30%. The company, which makes network test and service monitoring products for communications service providers, now sees revenue of $5 million to $5.2 million, down from an earlier estimate of $6.3 million to $6.8 million. "The shortfall reflects the timing of a major order from an existing customer, which was originally scheduled for delivery during the first quarter," the company said. Radcom expects to release first-quarter results on April 24. Shares sank $1.25 to $2.95.

Shares of Seagate Technology(STX Quote) rose modestly after the maker of hard drives agreed to settle a patent dispute with storage company Cornice. The two companies agreed to terminate their litigation in Delaware and also agreed to not sue each other for patent infringement through the end of 2007. Seagate shares were up 11 cents to $26.44.

Keynote Systems(KEYN Quote) fell 4% after the company cut its fiscal second-quarter revenue estimate. The company, which monitors and measures Internet performance, expects to report revenue of $12.5 million to $13 million for the quarter ended March 31. Keynote previously projected revenue of $13.5 million to $14 million; analysts had forecast revenue of $13.7 million. The company blamed the shortfall on lower-than-expected customer experience management software revenue. Shares were trading down 49 cents to $10.95.