Mid-America Apartment Communities Inc. and AmSurg Corp. will join the S&P 500 index , according to S&P Dow Jones Indices late Tuesday. The adds to the index will occur after the close of trading on Thursday, S&P said. On the large-cap index, Mid-America will replace Owens-Illinois Inc. and AmSurg, which is acquiring Envision Healthcare Holdings Inc. , will replace Legg Mason Inc. . Shares of Mid-America were up less than 0.1% at $93.83 while shares of AmSurg were up 0.3% at $67.60 after hours.
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