Gilead Sciences Inc. (NASDAQ: GILD) saw its short interest fall to 94,135,575 shares at the end of May, down 4.2% from the 98,243,605 shares short in mid-May. Still, the days-to-cover ratio jumped to 9.11 days from 7.79 days. This was the first drop that you could really notice since the end of last summer, but this is still the third highest reading and mid-May was the highest reading of the last year. Gilead's short interest remains a hot-bed as its hep-C vaccine has been under fire over its cost.