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CBOE To Add DIAMONDS To Hybrid Trading System After July 15

Date 13/05/2005

The Chicago Board Options Exchange (CBOE) announced today that it plans to add new sparkle to its Hybrid Trading System, with the addition of options on DIAMONDS (DIA) after July 15, 2005, pending regulatory approval.The addition of DIAMONDS options brings the number of index options available for trading on the CBOE Hybrid Trading System to 36, including options on the S&P 500 Depositary Receipts (SPY), Mini-Nasdaq 100 Index (MNX) and Nasdaq-100 Index Tracking Stock (QQQ).

"We are tremendously pleased with the success of our Hybrid Trading System so far, and look forward tothe opportunities that will be provided to the investing public as we continue our measured roll-out of the system," said CBOE Chairman and CEO William J. Brodsky."The CBOE Hybrid Trading System, which was built in-house, was designed to be, first and foremost, adaptable and expandable to meet the challenges of today's rapidly changing competitive environment."

"The DIAMONDS ETF is an extremely popular product that provides investors with an efficient way to trade the Dow Jones Industrial Average.Trading DIAMONDS options on CBOE's Hybrid Trading System offers customers the best of both worlds-the speed and transparency of electronic trading, combined with the market depth and liquidity of CBOE's trading floor," said Michael A. Petronella, president of Dow Jones Indexes.

The CBOE Hybrid Trading System, launched in July 2003, is the first truly hybrid trading system, offering investors the advantages of point-and-click executions, combined with the liquidity and superior price discovery of an open outcry market.

DIAMONDS (ticker symbol DIA) represent shares in an exchange-traded fund designed to track the performance of the Dow Jones Industrial Average (DJIA), that trades like a stock. Options on DIAMONDS provide investors with exposure to the Dow Jones Industrial Average in one transaction, which can also offer the benefit of limited risk.Buyers of DIAMONDS options have pre-determined risk that is limited to the amount of premium paid.

CBOE, the world's largest options marketplace and the creator of listed options, is regulated by the SEC.For additional information about the CBOE and its products, access the CBOE website at: http://www.cboe.com/