Here are the S&P 500’s best and worst stock performers of 2018 By: MarketWatch December 06, 2018 at 12:10 PM EST The health-care sector is the big winner, but there are also some surprises. Read More >> Related Stocks: Abiomed Inc Adv Micro Devices Advance Auto Parts Inc Affiliated Managers Group Alphabet-A Alphabet-C Amazon.com Apple Chipotle Mexican Grill Coty Inc Dentsply Sirona Inc Facebook Fortinet Inc General Electric Hca Holdings Inc INVESCO Ltd Illumina Inc L Brands McCormick & Co Mohawk Industries Netflix Newfield Exploration PG&E Corp TripAdvisor Under Armour Western Digital