CBOE Holdings Reports All-Time Record Trading Volume In August 2011: - CBOE Holdings Averages A Record 6.6 Million Options Contracts Per Day In August, Up 88% From August 2010 And Up 44% From July 2011 - CBOE, CBOE Futures Exchange, C2 Establish New Individual Monthly Volume Records - Index And ETF Option Sectors, SPX, SPY And VIX Options Mark All-Time Volume Records

CBOE Holdings, Inc. (NASDAQ: CBOE) today reported that August trading volume for options on theChicago Board Options Exchange (CBOE) and C2 Options Exchange (C2), the company's alternative all-electronic market, combined, established an all-time record of 151.2 million contracts; record average daily volume (ADV) was nearly 6.6 million contracts, up 88 percent from August 2010 and an increase of 44 percent from July 2011. CBOE, CBOE Futures Exchange (CFE) and C2 each posted all-time record monthly volumes and ADV in August.

CBOE Trading Volume and Market Share:

CBOE Options Trading:

• CBOE achieved an all-time total monthly volume record in August 2011 with 144.0 million contracts traded, surpassing October 2008 when a record 134.2 million contracts changed hands.   CBOE's August ADV of 6.3 million contracts was a 79-percent increase from 3.5 million contracts per day inAugust 2010 and a 44-percent increase from July 2011 ADV of 4.3 million contracts.
• CBOE index options — August 2011 index options ADV established a new all-time monthly high of just under two million contracts, surpassing the previous record ADV of 1.5 million contracts set in October 2008. August 2011 ADV was up 120 percent from 907,000 contracts ADV in August 2010 and up 54 percent from July 2011 ADV of 1.3 million contracts. Additionally, S&P 500 Index (SPX) and CBOE Volatility Index (VIX) options contracts established new ADV records in August, with 1.3 million and 582,000 contracts, respectively.  
• CBOE ETF options — August 2011 ETF options ADV marked a new all-time monthly high of 2.1 million contracts, surpassing the previous record ADV of just over two million contracts set in May 2010. August 2011 ADV was up 151 percent from 846,600 contracts ADV in August 2010 and up 74 percent from July 2011 ADV of 1.2 million contracts. In addition, S&P Depositary Receipts (SPY) options established a new ADV record of 976,750 contracts in August.
• CBOE equity options — August 2011 equity options ADV was 2.1 million contracts, up 23 percent from 1.7 million contracts ADV in August 2010 and up 17 percent from July 2011 ADV of 1.8 million contracts.
• The five most actively traded index and ETF options at CBOE during August were the S&P 500 Index (SPX), Standard and Poor's Depositary Receipts (SPY), CBOE Volatility Index (VIX), iShares Trust - Russell 2000 Index Fund (IWM) and QQQ Trust (QQQ).
• The five most actively traded equity options at CBOE during August were Bank of America (BAC), Apple (AAPL), Citigroup (C), Cisco Systems (CSCO) and JPMorgan Chase & Co. (JPM).

Expanded August volume information for CBOE index and ETF options is available at: www.cboe.com/data/monthlyvolume.aspx.

CBOE Market Share: CBOE's market share of total U.S. options industry volume in August was 26.2 percent, up 1.2 percentage points from July 2011 and down one percentage point from August 2010.  If the volume from dividend trades was excluded from CBOE's data for August 2011, the Exchange's total market share for August would increase to 26.5 percent from 26.2 percent, an increase of 0.3 of a market share point. Exclusion of dividend trades from total industry volume data presents a more relevant measure of the relative trends in the options business.

CBOE August Market Share by Product:

• Index options — CBOE's market share was 95.4 percent, up 0.7 of a percentage point from July 2011 and up 1.3 percentage points from August 2010.
• ETF options — CBOE's market share was 19.3 percent, up 0.7 of a percentage point from July 2011 and down 0.8 of a percentage point from August 2010.
• Equity options — CBOE's market share was 19.8 percent, up 0.5 of a percentage point from July 2011 and down 2.9 percentage points from August 2010.

C2 Trading Volume and Market Share:

C2 posted its most active month ever in August 2011, surpassing July 2011 volume records.  August ADV was 310,800 contracts, up 41 percent from July 2011 ADV of 220,100 contracts. C2 ETF options ADV in August was up 35 percent from July 2011, and equity options ADV increased by 59 percent compared with July.

C2 Market Share:  C2's market share of total U.S. options industry volume in August 2011 was 1.3 percent, even with July 2011.

CFE Futures Trading:

• August 2011 marked CBOE Futures Exchange's (CFE) busiest month ever.  The 1,828,511 contracts traded during the month was a new all-time high, beating the previous high of 1,223,214 contracts traded in June 2011.  When compared to the 1,170,656 contracts traded during July 2011 and the 291,533 contracts traded in August 2010, total volume in August rose by 56 percent and 527 percent, respectively.  
• Total CBOE Volatility Index (VIX) futures volume in August established an all-time record of 1,826,241 contracts, surpassing the previous high of 1,222,257 contracts traded in June 2011. August was the fourth consecutive month in which VIX futures registered a new record for average daily volume.  The 79,402 contracts per day during August 2011 beat the previous high of 58,453 contracts per day during July.  August ADV gained 36 percent when compared to July 2011 ADV and was up 500 percent versus 13,227 contracts ADV in August 2010.
• August marked the twenty-third consecutive month of year-over-year volume increases for CFE and VIX futures.

CBOE Holdings Average Transaction Fee Per Contract:

The following represents average transaction fee per contract based on a three-month rolling average, reported on a one-month lag.  The average transaction fee per contract represents total transaction fees for CBOE, C2 and CBOE Futures Exchange (CFE) recognized for the period divided by total contracts traded during the period.  Average transaction fees per contract can be affected by various factors, including exchange fee rates, volume-based discounts and transaction mix by contract type and product type.