NEW YORK, May 18, 2016 /PRNewswire/ -- S&P MidCap 400 constituent LKQ Corp. (NASD: LKQ) will replace Airgas Inc. (NYSE: ARG) in the S&P 500, S&P SmallCap 600 constituent Medical Properties Trust Inc. (NYSE: MPW) will replace LKQ in the S&P MidCap 400, and Alamo Group Inc. (NYSE: ALG) will replace Medical Properties Trust in the S&P SmallCap 600 after the close of trading on Friday, May 20. Air Liquide SA is acquiring Airgas in a deal expected to be completed on or about that date pending final conditions. 

LKQ distributes replacement parts, components, and systems used in the repair and maintenance of vehicles. Headquartered in Chicago, IL, the company will be added to the S&P 500 GICS (Global Industry Classification Standard) Distributors Sub-Industry index.

Medical Properties Trust, a real estate investment trust (REIT), acquires, develops, and invests in healthcare facilities. Headquartered in Birmingham, AL, the company will be added to the S&P MidCap 400 GICS Health Care REITs Sub-Industry index.

Alamo Group designs, manufactures, and sells agricultural equipment and infrastructure maintenance equipment. Headquartered in Seguin, TX, the Company will be added to the S&P SmallCap 600 GICS Construction Machinery & Heavy Trucks Sub-Industry index.

Following is a summary of the changes:

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