: Hyatt will join S&P MidCap 400; shares rally after hours

Hotel chain Hyatt Hotels Corp. H will replace National Instruments Corp. NATI on the S&P MidCap 400 before the opening of trading on Thursday, S&P Dow Jones Indices said on Monday. The change is taking hold after Emerson Electric Co. EMR agreed to acquire National Instruments. Shares of Hyatt were up 5.3% after hours on Monday.

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