S&P announced that Microsemi (MSCC) will replace Atwood Oceanics (ATW) in the S&P MidCap 400 Index and Atwood will replace Microsemi in the S&P SmallCap 600 after the close of trading on January 15th. Microsemi is set to acquire PMC-Sierra (PMCS) in a deal expected to be completed around the date.
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