SunPower Corp. (NASD: SPWR) will replace Cimarex Energy Co. (NYSE: XEC) in the S&P MidCap 400 effective prior to the opening of trading on Tuesday, October 5. S&P 500 constituent Cabot Oil & Gas Corp. (NYSE: COG) is acquiring Cimarex Energy in a deal expected to close on October 1.

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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