By Chuck Mikolajczak
NEW YORK (Reuters) - Biotech stocks are moving higher on Wednesday, bouncing back from a two-day drop, helped by gains in Gilead Sciences
Gilead said its HIV tablet containing tenofovir alafenamide was found better than its approved drug, Stribild, in two mid-stage studies, sending shares up 2.5 percent to $108.06.
Of the 119 stocks that comprise the Nasdaq biotech index, only 10 were in negative territory.
The gains helped lift the biotech index <.NBI> 2.4 percent, putting it on track for its best day in two months. Also moving higher were Biogen Idec
* S&P 500 <.SPX> was rising 9.89 points, or 0.5 percent.
* Nasdaq Comp <.IXIC> was gaining 34.30 points, or 0.76 percent.
* Dow industrials <.DJI> was adding 103.91 points, or 0.61 percent.
* Russell 2000 <.TOY> was adding 5.8 points, or 0.52 percent.
* S&P MidCap <.IDX> was adding 2.41 points, or 0.17 percent.
* S&P SmallCap <.SPCY> was gaining 2.95 points, or 0.46 percent.
(Reporting by Chuck Mikolajczak; Editing by Meredith Mazzilli)