X0202 4 2004-09-08 0 0000813347 KOMAG INC /DE/ KOMG 0001230573 HONARDOOST KAMRAN 1710 AUTOMATION PARKWAY SAN JOSE CA 95131 0 1 0 0 VP, NEW PRODUCT INTRO & DESIGN Common Stock 2004-09-08 4 M 0 2007 0.00 A 2007 D Common Stock 2004-09-08 4 S 0 250 12.25 D 1757 D Common Stock 2004-09-08 4 S 0 250 12.42 D 1507 D Common Stock 2004-09-08 4 S 0 250 12.43 D 1257 D Common Stock 2004-09-08 4 S 0 250 12.47 D 1007 D Phantom Stock 0.00 2004-09-08 4 M 0 2230 0.00 D 2002-10-07 2002-11-06 Common Stock 2230 6520 D Pursuant to the Komag Deferred Compensation Plan, Reporting Person is subject to a 10% forfeiture (223 shares) deducted from vested shares (2230 shares) that are withdrawn early from the Komag Deferred Compensation Plan. Under the Komag Deferred Compensation Plan, each unit of Phantom Stock has a value equal to one share of KOMG common stock. The Phantom Stock will be payable in shares of KOMG common stock at a date in the future as selected by the Purchaser. The vesting schedule of the Phantom Stock is the same as the associated stock purchase right under which the Phantom Stock was acquired. This transaction was executed pursuant to a 10b5-1 plan that was adopted on March 5, 2004. The securities were acquired from the 2002 Qualified Stock Plan and converted into phantom stock. One-fourth (1/4) of the securities acquired shall vest on January 6, 2003, one-fourth (1/4) of the securities acquired shall vest on July 7, 2003, one-fourth (1/4) of the securities acquired shall vest on January 6, 2004, one-fourth (1/4) of the securities acquired shall vest on July 6, 2004, provided that the Reporter does not cease to be a service provider to Komag Incorporated prior to any such vesting date. /s/ Jan Schwartz, Attorney-in-fact for Kamran Honardoost 2004-09-08