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Altera Pulls Down Chips

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(ALTR) - Get Altair Engineering Inc. Class A Report

was down 9.2% in early trading after bottoming at a 52-week low of $19.63. After Thursday's close the specialty chipmaker lowered its guidance for fourth-quarter revenue, citing a sluggish November sales. The warning brought on a slew of downgrades throughout the sector and helped send tech stocks plummeting. Chip bellwether


(INTC) - Get Intel Corporation Report

was down 10.4%.

PMC Sierra

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was down 11%.

Micron Technology

(MU) - Get Micron Technology, Inc. Report

lost 9.7%. The

Semiconductor Index


was down 7.7% and was again setting 52-week lows.