S&P Dow Jones Indices will make the following index adjustments to the S&P 500, S&P MidCap 400 and S&P SmallCap 600 to ensure each index more appropriately represents its market capitalization range. The changes will be effective prior to the open of trading on Monday, December 23 to coincide with the December re-balance. Live Nation Entertainment (LYV), Zebra Technologies (ZBRA), and Steris (STE) will move to the S&P 500, switching places with Affiliated Managers Group (AMG), TripAdvisor (TRIP), and The Macerich Co. (MAC), respectively. All companies moving to the S&P 500 have market capitalizations above $12B, and all companies moving to the S&P MidCap 400 have market capitalizations below $4.5B. Grand Canyon Education (LOPE) and Lear (LEA) will replace Oasis Petroleum (OAS) and Southwestern Energy (SWN) in the S&P MidCap 400 respectively. Oasis Petroleum and Southwestern Energy will replace Unit Corp. (UNT) and Frontier Communications (FTR) in the S&P SmallCap 600. Oasis Petroleum and Southwestern Energy are more representative of the small-cap market space, while Unit and Frontier Communications are no longer representative of the small-cap market space. Arrowhead Pharmaceuticals (ARWR) will switch places with Granite Construction (GVA) in the S&P MidCap 400. Arrowhead Pharmaceuticals has a market capitalization more representative of the mid-cap market space, and Granite Construction has a market capitalization more representative of the small-cap market space.