Thursday's Tech Winners & Losers

Shares of Motorola(MOT Quote) were among the technology sector's losers Thursday, falling 6.5% after the cell-phone maker slashed its first-quarter revenue guidance and warned that earnings would be well below expectations.

The company now sees revenue of $9.2 billion to $9.3 billion, well below its previous guidance of $10.4 billion to $10.6 billion. The company expects adjusted earnings of break-even to 2 cents a share. Analysts project earnings of 17 cents a share on revenue of $10.44 billion.

Motorola also announced that David Devonshire would step down as chief financial officer. He'll be replaced by Thomas Meredith, who will serve as acting CFO beginning on April 1. "Performance in our mobile devices business continues to be unacceptable, and we are committed to restoring its profitability," the company said. "After further review following the leadership change in our mobile devices business, we now recognize that returning the business to acceptable performance will take more time and greater effort." Shares were down $1.22, to $17.52, below their 52-week low. ...