Leaders & losers
Adaptec Inc declined US$0.84 to US$7.60. The maker of circuit cards that speed up the connections between computers said sales in the quarter ended June 30 were US$107 million. It had previously forecast US$115 million to US$120 million.
Micrel Inc dropped US$0.86 to US$10.12. The maker of semiconductors for computers and communication gear said second-quarter revenue fell 3 percent to 4 percent from the previous quarter. It had forecast an increase of 3 percent to 5 percent.
Documentum Inc, which makes document-management software, plunged US$4.06 to US$15.69. The company said second-quarter revenue was US$68 million, below the US$72 million to US$73 million it expected.
Knight Trading Group Inc, the biggest market-maker of NASDAQ Stock Market securities, surged US$1.83 to US$8.50 after the company said second-quarter profit will be double its earlier forecast because trading picked up. The 27 percent surge was the stock's biggest in more than four years.
Ameritrade Holding Corp, the second-biggest shareholder in Knight after Merrill Lynch, rose US$0.46 to US$7.88.
Boston Scientific Corp, a medical-device maker, added US$0.53 to US$62.56. The company said it plans to hire 1,200 people and spend more to market a new heart stent that helped boost sales in the second quarter.
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