If you needed more proof that 2016 is a big mean-reversion year, take a look at the performance of the 10 best performing S&P500 stocks from 2015 year-to-date. On average, those 10 stocks were up 72% in 2015. In 2016, their average return is lagging the S&P500 by being up 4.3%. One of them was acquired in September 2015, so I am showing only 9 for 2016.
Take a look at the 10 worst S&P500 performers of 2015. On average, they lost about 60% in 2015. Year-to-date, they are up 17%.