Cboe Crude Oil ETF Volatility Index (OVX) www.cboe.com/OVX

The Cboe Crude Oil ETF Volatility Index ("Oil VIX", Ticker - OVX) measures the market's expectation of 30-day volatility of crude oil prices by applying the VIX® methodology to United States Oil Fund, LP (Ticker - USO) options spanning a wide range of strike prices.

Key Links

OVX Index - Links

Press Release - July 14, 2008 Cboe Introduces New Crude Oil Volatility Index (OVX)

The United States Oil Fund is an exchange-traded security designed to track changes in crude oil prices. By holding near-term futures contracts and cash, the performance of the Fund is intended to reflect, as closely as possible, the spot price of West Texas Intermediate light, sweet crude oil, less USO expenses.