iPath S&P 500 VIX Short Term Futures ETN ( VXX) -2.7% Although major market indices have spent the day struggling to maintain their footing in positive territory, investors are showing little sign of hesitance. With confidence in vogue, the VIX-tracking VXX is sliding to its fourth day of losses. Thanks this stretch of weakness, the ETN has given back a notable portion of its early-February gains. All prices as of 2:11 PM EST. Written by Don Dion in Williamstown, Mass.