Know you were asking OB but I though I'd give you my .02 I don't think it's anything stock specific as just about all the Bio Tech's have taken a beating. IMO RNA has held up pretty well considering. http://stockcharts.com/c-sc/sc?s=XBI&p=D&yr=0&mn=6&dy=0&i=p63054346613&r=1397133479973