The Ensign Group Set to Join S&P MidCap 400; Curbline Properties & TransMedics Group to Join S&P SmallCap 600

• S&P SmallCap 600 constituent The Ensign Group Inc. (NASD: ENSG) will replace Southwestern Energy Co. (NYSE: SWN) in the S&P MidCap 400 and TransMedics Group, Inc. (NASD: TMDX) will replace The Ensign Group in the S&P SmallCap 600 effective prior to the opening of trading on Tuesday, October 1.  S&P MidCap 400 constituent Chesapeake Energy Corp. (NASD: CHK) is acquiring Southwestern Energy in a deal expected to be completed October 1.
  
  
• Curbline Properties Corp. (NYSE: CURB) will be added to the S&P SmallCap 600 effective prior to the open of trading on Tuesday, October 1, replacing Cross Country Healthcare Inc. (NASD: CCRN), which will be removed from the S&P SmallCap 600 effective prior to the opening of trading on Wednesday, October 2. S&P SmallCap 600 constituent SITE Centers Corp. (NYSE: SITC) is spinning off Curbline Properties in a transaction expected to be completed on October 1. Cross Country Healthcare is no longer representative of the small-cap market space.

Following is a summary of the changes that will take place prior to the open of trading on the effective date:

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