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Comments on CBOE Rulemaking

Notice of Filing of Proposed Rule Change Regarding Penny Price Improvement

(Release No. 34-55724; File No. SR-CBOE-2007-39)

Jun. 4, 2006 John C. Nagel, Head of Global Compliance, Director and Associate General Counsel, Citadel Investment Group, L.L.C., Chicago, Illinois
Dec. 21, 2006 Comments of Michael J. Simon, Secretary, International Securities Exchange LLC, New York, New York

Modified: 06/05/2007