ProShares Ultra DJ-UBS Crude Oil (NYSEArca: UCO) was one of the biggest gainers among the ETFs on Wednesday, October 20, 2010. The fund rallied 5.32% to close at $10.49. ProShares Ultra DJ-UBS Crude Oil seeks daily investment results, before fees and expenses, that correspond to twice (200%) the daily performance of the Dow Jones—UBS Crude Oil Sub-Index SM.
iPath S&P 500 VIX Short-Term Futures ETN (NYSEArca: VXX) was one of the biggest losers among the ETFs. The fund slumped 4.56% to close at $13.82. The S&P 500 VIX Short-Term Futures™ Index TR is designed to provide access to equity market volatility through CBOE Volatility Index® (the "VIX Index") futures.
Standard & Poor's Depositary Re (NYSEArca: SPY), as usual, was the most active ETF by share volume. The fund seeks to correspond generally to the price and yield performance, before fees and expenses, of the S&P 500 Index. SPDR Trust is an exchange-traded fund that holds all of the S&P 500 Index stocks. SPY closed at $117.88 and had a volume of 174.95M shares.
Disclosure: Author doesn't own any of the stocks discussed here.