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CBOE Files S-4 Registration Statement With SEC

Date 12/02/2007

The Chicago Board Options Exchange announced that its subsidiary, CBOE Holdings, Inc., has filed an S-4 Registration Statement with the Securities and Exchange Commission (SEC) that sets forth the terms of its proposed demutualization transaction. CBOE's proposed demutualization is subject to regulatory approval by the SEC and a vote of the CBOE membership.

"I am pleased to announce that CBOE has filed its S-4 Registration Statement with the SEC, a landmark moment in our exchange's history, as we complete the first major step in the conversion into a new demutualized, stockholder owned company," said CBOE Chairman and CEO William J. Brodsky. "Operating as a demutualized company will sharpen CBOE's for-profit focus and enhance our ability to create value for owners and customers in every aspect of our business."

CBOE is currently a mutually-owned membership organization. In its proposed demutualization, CBOE will become a wholly-owned subsidiary of a new holding company, CBOE Holdings, Inc. CBOE memberships existing at the time of the demutualization will be converted into shares of CBOE Holdings stock.

The filing is available on the CBOE website at: http://www.cboe.com/Demutualization.

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