NEW YORK, Nov. 23, 2015 /PRNewswire/ -- S&P Dow Jones Indices will make the following changes to the S&P 500, S&P MidCap 400 and S&P SmallCap 600 indices:

• CSRA Inc. (NYSE: CSRA) will be added to the S&P 500 after the close of trading on Friday, November 27, replacing Computer Sciences Corp. (NYSE: CSC), which will be removed from the S&P 500 after the close of trading on Monday, November 30. CSRA will be added to the S&P 500 on a zero price basis reflecting its spin-off from Computer Sciences. Following the spin-off, the Computer Sciences stub will replace Apollo Education Group Inc. (NASD: APOL) in the S&P MidCap 400. Computer Sciences' post spin market capitalization will be more representative of the mid-cap market space. Apollo Education is ranked at the bottom of the S&P MidCap 400.

• Phibro Animal Health Corp. (NASD: PAHC) will replace Pericom Semiconductor Corp. (NASD: PSEM) in the S&P SmallCap 600 after the close of trading on Wednesday, November 25. S&P SmallCap 600 constituent Diodes Inc. (NASD: DIOD) is acquiring Pericom Semiconductor in a deal expected to be completed soon pending final conditions.

CSRA provides information technology services to the U.S. federal government. Headquartered in Falls Church, VA, the company will be added to the S&P 500 GICS (Global Industry Classification Standard) Data Processing & Outsourced Services Sub-Industry index for one day before switching to IT Consulting & Outsourced Services Sub-Industry.

Computer Sciences provides information technology and professional services and solutions. Headquartered in Falls Church, VA, the company will be added to the S&P MidCap 400 IT Consulting & Outsourced Services Sub-Industry index.

Phibro Animal Health operates as a diversified animal health and mineral nutrition company. Headquartered in Teaneck, NJ, the company will be added to the S&P SmallCap 600 GICS Pharmaceuticals Sub-Industry index.

Following is a summary of the changes:

Additions to and deletions from S&P Dow Jones Indices do not in any way reflect an opinion on the investment merits of the companies involved.

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