Broadcom dropped US$1.82, or 15 percent, to US$10.63. The biggest maker of cable-modem semiconductors said revenue will be unchanged in the fourth quarter from the third. Analysts surveyed by First Call had forecast higher sales.
Siebel and Broadcom fell even as rivals in their industries advanced. During the rally over the past six sessions, 90 percent of the stocks in the S&P 500 rose.
Siebel rival PeopleSoft Inc gained US$0.78 to US$17.14. Among makers of chips and chip equipment, Maxim Integrated Products Inc gained US$0.65 to US$29.63, and Teradyne Inc advanced US$0.66 to US$10.56.
Ford Motor Co slid US$0.23 to US$8.26 and General Motors Corp, the world's largest automaker, fell US$1.09 to US$34.31.
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