X0202 4 2004-07-27 0 0000813347 KOMAG INC /DE/ KOMG 0001230579 TAN THIAN H 1710 AUTOMATION PARKWAY SAN JOSE CA 95131 1 1 0 0 CEO Common Stock 2004-07-27 4 M 0 45000 0.00 A 45000 D Phantom Stock 0.00 2004-07-27 4 M 0 45000 0.00 D 2002-10-07 2002-11-06 Common Stock 45000 180000 D Scheduled disbursement from 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 securities were acquired from the 2002 Qualified Stock Plan on October 7, 2002 and converted into phantom stock on October 28, 2002. The Reporter had until November 6, 2002 to elect to convert his previously granted stock purchase right into phantom stock under the Komag Deferred Compensation Plan. 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 Thian Hoo Tan 2004-07-27