His performance was so bad that it prompted one of his kids to give him some brutal investment advice : "Dad, why don't you just short your longs and long your shorts?" Greenlight's portfolio had very few winners. To make matters worse, the fund's worst-performing investments - Consol Energy , Micron Technology , and SunEdison - Consol fell more than 77% over the course of 2015, while Micron fell more than 59% and SunEdison dropped 74%.