CORPORATE EVENT: Diamond Offshore Drilling (DO) Special Cash Distribution 2/12/07

Clearing House Advisory Notices

To	Clearing Member Firms
From	Clearing House Department
Subject	CORPORATE EVENT: Diamond Offshore Drilling (DO) Special Cash Distribution 2/12/07
Notice Date	2007-02-05
Notice Number	07-31
Effective Date	2007-02-12
Diamond Offshore Drilling, Inc. (DO)has announced a special cash distribution of $4.00 per DO common share. The ex-distribution date is Monday, February 12, 2007. This corporate action will be coordinated with the Options Clearing Corporation. For the full text of this advisory . . .