Variable Tick Threshold Levels

Clearing House Advisory Notices

To	All Firm Personnel, Service Bureau Representatives, Independent Software Vendors
From	Clearing House Department
Subject	Variable Tick Threshold Levels
Notice Date	2006-03-17
Notice Number	06-63
Effective Date	2006-03-17
Variable Tick Threshold Levels to change for the S&P 500® (SP), S&P/Citigroup Growth TM (SG) and S&P/Citigroup Value TM (SU) Options and the E-mini® S&P Options and Option Strategies (ES)—EFFECTIVE Sunday, April 2, 2006 (on CME® Globex® ) for Trade Date Monday, April 3, 2006. For the full text of this advisory. . .