AT&T (T): The long-distance phone company said it has appointed David Dorman as president. Dorman previously served as chief executive of AT&T's Concert, a joint venture with British Telecommunications. Shares of AT&T rose 6 cents, or less than 1 percent, to $18.94 in morning trading.
Altera (ALTR): The maker of programmable computer chips named John Daane as president and chief executive. Daane was previously an executive vice president at LSI Logic (LSI). He will replace Rodney Smith, who said last year he intended to retire. Shares of Altera rose 19 cents, or nearly 1 percent, to $27.50.
Cognex (CGNX): The maker of Web inspection systems used by chipmakers warned that its fourth-quarter profit would miss analysts' forecasts by up to 10 cents per share because of order declines. Shares of Cognex plunged $7.81, or about 30 percent, to $18.38.
Amazon.com (AMZN): Banc of America Securities analyst Thomas Courtney said in a research note that the company's 40 percent revenue growth goal is "somewhat aggressive." He reiterated his "market performer" rating and said investors should avoid the stock. Shares of Amazon slid $3.19, or about 11 percent, to $24.81.
Rational Software (RATL): The software maker said it agreed to buy the 65 percent of closely held Catapulse it does not already own for about $405 million in stock. Shares of Rational Software fell $5, or 13 percent, to $33.31.