XIV (VelocityShares Daily Inverse VIX Short Term ETN) is the largest in the space, having accumulated about $290 million in assets under management. Others are: SVXY (ProShares Short VIX Short Term Futures ETF) and ZIV (VelocityShares Daily Inverse VIX Medium Term ETN).
iPath S&P 500 VIX Short Term Futures ETN
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