iPath S&P 500 VIX ST Futures ETN (VXX) trading higher in after hours

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IPATH S&P 500 VIX SHORT-TERM FUTURES ETN DUE 1/30/2019 (NYSE: VXX) Delayed: 18.01 +0.62 (3.57%)
Previous Close $17.39    52 Week High $40.93 
Open $17.77    52 Week Low $9.30 
Day High $18.56    P/E N/A 
Day Low $17.64    EPS $0.00 
Volume 9,296,376