S&P Announces Changes to US Indices: CHSI for AAI in MidCap 400, CLMS for CHSI in SmallCap 600
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S&P SmallCap 600 constituent Catalyst Health Solutions Inc. (NASDAQ: CHSI) will replace AirTran Holdings Inc. (NYSE: AAI) in the S&P MidCap 400 index, and Calamos Asset Management Inc. (NASDAQ: CLMS) will replace Catalyst Health Solutions in the S&P SmallCap 600 index after the close of trading on Monday, May 2, 2011. S&P 500 constituent Southwest Airlines Co (NYSE: LUV) is acquiring AirTran Holdings in a deal expected to be completed on or about that date pending final approvals.
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