AlteraShares of Altera ( ALTR) fell in extended action after the chip maker lowered its revenue outlook for its fiscal fourth quarter. The company cited widespread weakness from both small and large customers and across all geographies except North America. San Jose, Calif.-based Altera now sees a sequential revenue decline of 13-to-16% in the quarter ending this month, a deeper drop than its prior projection of 7-to-11% from the third-quarter total of $522.5 million. The current average estimate of analysts polled by Thomson Reuters is for revenue of $475 million in the December-ending period, implying a sequential decline of 9%. The stock was last quoted at $33.80, down 5%, on late volume of more than 200,000.