Health care goes negative for the year

Health care, doctor, medical
Thierry Dosogne | Getty Images

The health care sector fell 2 percent on Friday, sending it 1 percent lower on the year.

As of Friday's close, it is the only sector in the S&P 500 that is negative year to date.

The biggest underperformers in the health care sector include Endo International, Perrigo, and Alexion Pharmaceuticals, which are down more than 67 percent, 38 percent and 34 percent, respectively, in 2016.

— CNBC's Gina Francolla contributed to this report.