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CBOE Holdings Announces Preliminary Results Of Tender Offers

Date 24/11/2010

CBOE Holdings, Inc. (Nasdaq: CBOE) today announced that its two tender offers for shares of its class A-1 and class A-2 common stock were oversubscribed based on the preliminary count by BNY Mellon Shareowner Services, the depositary for the tender offers. The tender offers expired at 5:00 p.m., New York City Time, on Tuesday, November 23, 2010. Accordingly, after prorating in accordance with the terms of the tender offers, CBOE Holdings expects to purchase 5,983,713 shares of class A-1 common stock and 5,983,713 shares of class A-2 common stock, the full number of shares sought in each tender offer, at $25.00 per share.

CBOE Holdings expects to announce final results of the offers later today. Promptly after such announcement, the depositary will issue payment for the shares validly tendered and accepted for purchase.

The class A-1 and class A-2 common stock is held by former seat owners of Chicago Board Options Exchange, Incorporated, and members of the settlement class in CME Group Inc. et al v. Chicago Board Options Exchange, Incorporated, et al. The class A-1 and class A-2 common stock is currently subject to transfer restrictions and cannot be sold in any public market. Following the tender offers, CBOE Holdings expects to have 38,340,090 shares of class A-1 common stock and 38,340,090 shares of class A-2 common stock outstanding.

The tender offers were made only pursuant to offers to purchase (as supplemented) and related letters of transmittal, which were previously filed with the Securities and Exchange Commission and forwarded to record holders of the class A-1 and class A-2 common stock.

Holders of class A-1 and class A-2 common stock can direct questions with respect to the tender offers to BNY Mellon Shareowner Services at (866) 353-0872.