RF Micro Devices Up Ahead of Joining Index

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RF Micro Devices

(RFMD)

, which makes chips for wireless services, was up 13% in early trading. The company will be added to the

S&P MidCap 400

at the close of trading, in place of staffing company

Robert Half

(RHI) - Get Report

. Robert Half is joining the

S&P 500

, replacing

Associates First Capital

, which was bought by

Citigroup

(C) - Get Report

. Robert Half was up 11%.