NEW YORK, Oct. 6, 2014 /PRNewswire/ -- Rex Energy Corp. (NASD: REXX) will replace GT Advanced Technologies Inc. (NASD: GTAT) in the S&P SmallCap 600 after the close of trading on Wednesday, October 8. GT Advanced Technologies filed for bankruptcy protection and is no longer eligible for inclusion in the S&P SmallCap 600.

Rex Energy operates as an independent oil and gas exploration and production company. Headquartered in State College, PA, the company will be added to the S&P SmallCap 600 GICS (Global Industry Classification Standard) Oil & Gas Exploration & Production Sub-Industry index.

Following is a summary of the change:

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