CBOE Experiences Busiest Trading Week In Its History; Volume Was Nearly 28 Million Contracts - Four Of The Busiest Single-Days In CBOE History Have Occurred In August, New Weekly Volume Record Also Set In Options On CBOE Volatility Index (VIX)

The Chicago Board Options Exchange (CBOE) announced that last week was the busiest trading week in its history as 27,866,804 contracts traded during the five trading days from Monday, August 6 through Friday, August 10, surpassing the previous high of 23.3 million contracts traded during the week of February 26 to March 2, 2007. Average daily volume last week was 5,573,361 contracts, 57% above the Exchange's year-to-date average daily volume of 3,539,338 contracts.

Additionally, four of the top ten busiest single trading days in CBOE history have occurred during the first eight trading days of August:
- Friday, August 10 -- 6,139,191 contracts, currently ranks #5 all-time
- Wednesday, August 8 -- 5,811,079 contracts, currently ranks #7 all-time
- Monday, August 6 -- 5,634,718 contracts, currently ranks #9 all-time
- Wednesday, August 1 -- 5,548,500 contracts, currently ranks #10 all-time

CBOE also set a new weekly volume record for trading of options on the CBOE Volatility Index (VIX) as 1,009,140 contracts traded during the week of Monday, August 6 to Friday, August 10. Last week's record volume topped the previous high of 909,038 contracts set just one week earlier, from July 30 to August 3, 2007. Average daily volume last week in VIX options was 201,828 contracts, 182% above the year-to-date average daily volume of 71,566 contracts.

The CBOE Volatility Index (VIX), introduced in 1993, has been viewed as the preeminent barometer of market volatility and investor sentiment. Derived from real-time S&P 500 Index option prices, VIX is designed to reflect investors' consensus view of expected near-term stock market volatility over the next 30 days. VIX is closely followed and highly publicized and is referred to as the market's "fear gauge." More information on the CBOE Volatility Index may be found at: www.cboe.com/VIX.

CBOE, the largest options marketplace in the U.S. and the creator of listed options, is regulated by the Securities and Exchange Commission (SEC). For additional information about the CBOE and its products, access the CBOE website at: www.cboe.com/.