Prospectus Supplement Filed Pursuant to Rule 424(b)(3) (To Prospectus dated August 23, 2001) Registration Number 333-63980 $460,000,000 DIAMOND OFFSHORE DRILLING, INC. 1-1/2% CONVERTIBLE SENIOR DEBENTURES DUE 2031 -------------------------------------- This prospectus supplement relates to the resale by the holders of our 1-1/2% Convertible Senior Debentures Due 2031 and the shares of our common stock issuable upon the conversion of the debentures. This prospectus supplement should be read in conjunction with, and may not be delivered or utilized without, the prospectus dated August 23, 2001. The terms of the debentures are set forth in the prospectus. The information in the table appearing under the heading "Selling Securityholders" in the prospectus is amended by adding the information below with respect to persons not previously listed in the prospectus and by supplementing the information with respect to other persons previously listed in the prospectus that are listed below. PRINCIPAL AMOUNT OF PERCENTAGE NUMBER OF DEBENTURES BENEFICIALLY OF CONVERSION OWNED DEBENTURES SHARES THAT NAME THAT MAY BE SOLD OUTSTANDING MAY BE SOLD ---- ---------------- ----------- ----------- Absolute Return Fund, Ltd.................................... $ 500,000 0.11% 10,198 Aftra Health Fund............................................ 160,000 0.03% 3,263 Allstate Insurance Company................................... 2,400,000 0.52% 48,954 Allstate Life Insurance Company.............................. 500,000 0.11% 10,198 Bank Austria Cayman Islands Ltd.............................. 7,075,000 1.54% 144,314 BN Convertible Securities Top Fund........................... 500,000 0.11% 10,198 Julius Baer Multibond Convertbond............................ 1,000,000 0.22% 20,397 KBC Financial Products (Cayman Islands)...................... 16,000,000 3.48% 326,364 Lexington (IMA) Limited...................................... 500,000 0.11% 10,198 Mainstay Convertible Fund.................................... 2,360,000 0.51% 48,138 Mainstay VP Convertible Portfolio............................ 660,000 0.14% 13,462 Morgan Stanley & Co. Incorporated............................ 5,000,000 1.09% 101,989 New York Life Separate Account #7............................ 320,000 0.07% 6,527 Oklahoma Attorneys Mutual Insurance Company.................. 45,000 0.01% 917 OZ Master Fund, Ltd.......................................... 16,500,000 3.59% 336,563 Any other holder of debentures or future transferee from any such holder (1).............................................. $ 131,545,000 28.60% 2,683,228 Total ....................................................... $ 460,000,000 100.00% 9,382,897 (2) --------------------------- (1) Information concerning other selling holders of debentures will be set forth in prospectus supplements from time to time, if required. (2) The conversion shares do not total 9,382,988 shares due to rounding resulting from the elimination of fractional shares. -------------------------------------- The date of this prospectus supplement is September 10, 2001.