2017's Winners and Losers

The S&P 500 index ended 2017 up 19 percent, after closing at a fresh record high more than 60 times over the course of the year. Here are the index's biggest winners for the year:

• NRG Energy,  up 132 percent
• Align Technology, up 131 percent
• Vertex Pharmaceuticals, up 103 percent
• Wynn Resorts, up 95 percent
• Boeing, up 89 percent

And the biggest losers:

• Envision Healthcare,  down 45 percent
• Scana,  down 46 percent
• Under Armour, Class A down 50 percent, Class C down 47 percent
• Range Resources, down 50 percent
• Baker Hughes, a GE Company, down 51 percent