NEW YORK, Dec. 28, 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:

• Willis Group Holdings plc (NYSE:WSH) will replace Fossil Group Inc. (NASD:FOSL) in the S&P 500, and Fossil Group will replace Towers Watson & Co. (NASD:TW) in the S&P MidCap 400 after the close of trading on Monday, January 4. Willis Group is merging with Towers Watson in a deal expected to be completed on or about that date pending final conditions. Post merger, Willis Group Holdings will change its name to Willis Towers Watson plc and trade under the ticker symbol "WLTW". Fossil has a market capitalization that is more representative of the mid-cap market space.
   
• Adeptus Health Inc. (NYSE:ADPT) will replace Ferroglobe plc (NASD:GSM) in the S&P SmallCap 600 after the close of trading on Thursday, December 31. Globe Specialty Metals recently completed its combination with Grupo FerroAtlántica, creating a new company called Ferroglobe plc. The new company does not meet the domicile and public float criteria as outlined in the S&P U.S. Indices methodology.

Willis Towers Watson is a global advisory, broking and solutions firm. Headquartered in London, England the company will be added to the S&P 500 GICS (Global Industry Classification Standard) Insurance Brokers Sub-Industry index.

Fossil Group designs, develops, markets, and distributes consumer fashion accessories. Headquartered in Richardson, TX, the company will be added to the S&P MidCap 400 Apparel Accessories & Luxury Goods Sub-Industry index.

Adeptus Health owns and operates a network of independent freestanding emergency rooms. Headquartered in Lewisville, TX, the company will be added to the S&P SmallCap 600 GICS Health Care 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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SOURCE S&P Dow Jones Indices