NEW YORK, Jan. 23, 2013 /PRNewswire/ -- S&P Dow Jones Indices will make the following changes to the S&P MidCap 400 and the S&P SmallCap 600 indices:

• S&P SmallCap 600 constituent Extra Space Storage Inc. (NYSE: EXR) will replace Ralcorp Holdings Inc. (NYSE: RAH) in the S&P MidCap 400, and Dorman Products Inc. (NASDAQ: DORM) will replace Extra Space Storage in the S&P SmallCap 600 after the close of trading on Tuesday, January 29. S&P 500 constituent ConAgra Foods Inc. (NYSE: CAG) is acquiring Ralcorp in a deal expected to be completed on or around that date, pending final approvals.
• Era Group Inc. (NYSE: ERAwi) will replace Neutral Tandem Inc. (NYSE: IQNT) in the S&P SmallCap 600 after the close of trading on Thursday, January 31. S&P SmallCap 600 constituent SEACOR Holdings Inc. (NYSE: CKH) is spinning off Era Group to shareholders in a transaction expected to be completed on or about that date. Neutral Tandem has a market capitalization below $100 million and is no longer representative of the small cap market space.

Extra Space Storage is a real estate investment trust (REIT) that owns, develops, acquires and operates self-storage properties. Headquartered in Salt Lake City, Utah, the company will be added to the S&P MidCap 400 GICS (Global Industry Classification Standard) Specialized REITs Sub-Industry index.

Dorman Products supplies automotive replacement parts, fasteners, and service line products. Headquartered in Colmar, PA, the company will be added to the S&P SmallCap 600 GICS Auto Parts & Equipment Sub-Industry index.

Era Group provides helicopter transportation services. Headquartered in Houston, TX, the company will be added to the S&P SmallCap 600 GICS Oil & Gas Equipment & Services 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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For more information:

Dave Guarino
Communications
S&P Dow Jones Indices
dave_guarino@spdji.com
(201) 755-5334

David Blitzer
Managing Director and Chairman of the Index Committee
S&P Dow Jones Indices
david_blitzer@spdji.com
(917) 376-1204

SOURCE S&P Dow Jones Indices