4. VelocityShares Daily Inverse VIX Short Term ETN ( XIV) began trading on Nov. 29, 2010. The return on this exchange-traded note, or ETN, is linked to the inverse of the daily performance of the S&P 500 VIX Short-Term Futures¿ Index less the investor fee of 1.35%. Of course the inverse of 'VIX' would obviously be 'XIV'. No new ETN or ETF has performed better than this security with extraordinary returns ending May 31, 2011 of 60.9% over 6 months, 33.4% for 3 months, and 8.8% in one months on a lack of implied volatility in option contracts on the S&P 500.