Siliconix (SILI) was down 20.1% in late morning after electronics component maker Vishay (VSH) - Get Vishay Intertechnology, Inc. Report said its offer to buy the rest of Siliconix expired Thursday without being accepted. Vishay, which owns 80.4% of Siliconix, had extended its offer for the remainder of the company several times. Vishay was down 2.1%.

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