X0202 4 2006-03-02 0 0000813347 KOMAG INC /DE/ KOMG 0001230569 BAYLESS KATHLEEN A 1710 AUTOMATION PARKWAY SAN JOSE CA 95131 0 1 0 0 SVP, CFO Common Stock 2006-03-02 4 M 0 2333 6.48 A 33904 D Common Stock 2006-03-02 4 M 0 1313 13.16 A 35217 D Common Stock 2006-03-02 4 M 0 1000 18.85 A 36217 D Common Stock 2006-03-02 4 S 0 464 49.681 D 35753 D Common Stock 2006-03-02 4 S 0 100 49.78 D 35653 D Common Stock 2006-03-02 4 S 0 100 49.79 D 35553 D Common Stock 2006-03-02 4 S 0 100 49.83 D 35453 D Common Stock 2006-03-02 4 S 0 367 49.831 D 35086 D Common Stock 2006-03-02 4 S 0 728 49.981 D 34358 D Common Stock 2006-03-02 4 S 0 100 49.99 D 34258 D Common Stock 2006-03-02 4 S 0 364 49.991 D 33894 D Common Stock 2006-03-02 4 S 0 364 50.021 D 33530 D Common Stock 2006-03-02 4 S 0 100 50.041 D 33430 D Common Stock 2006-03-02 4 S 0 100 50.12 D 33330 D Common Stock 2006-03-02 4 S 0 364 50.121 D 32966 D Common Stock 2006-03-02 4 S 0 100 50.25 D 32866 D Common Stock 2006-03-02 4 S 0 365 50.251 D 32501 D Common Stock 2006-03-02 4 S 0 466 50.631 D 32035 D Common Stock 2006-03-02 4 S 0 100 50.71 D 31935 D Common Stock 2006-03-02 4 S 0 364 50.711 D 31571 D Non-Qualified Stock Option (right to buy) 6.48 2006-03-02 4 M 0 2333 0.00 D 2013-03-17 Common Stock 2333 3667 D Non-Qualified Stock Option (right to buy) 13.16 2006-03-02 4 M 0 1313 0.00 D 2013-07-25 Common Stock 1313 2062 D Non-Qualified Stock Option (right to buy) 18.85 2006-03-02 4 M 0 1000 0.00 D 2014-03-15 Common Stock 1000 3557 D This trade was executed pursuant to a Rule 10b5-1 trading plan. The Reporting Person exercised 2,333 shares of the 16,000 share option granted on 03/17/2003, of which 4,000 shares subject to the Option shall vest on 10/07/2003 and 1/36 of the remaining 12,000 shares subject to the Option shall vest on the 7th of each month thereafter, subject to the Optionee continuing to be a Participant of Komag Incorporated Amended and Restated 2002 Qualified Stock Plan on such dates. The Reporting Person exercised 1,313 shares of the 9,000 share option granted on 07/25/2003, of which 2,250 shares subject to the Option shall vest on 10/07/2003 and 1/36 of the remaining 6,750 shares subject to the Option shall vest on the 7th of each month thereafter, subject to the Optionee continuing to be a Participant of Komag Incorporated Amended and Restated 2002 Qualified Stock Plan on such dates. The Reporting Person exercised 1,000 shares of the 6,250 share option granted on 03/15/2004, of which 1,563 shares subject to the Option shall vest on 03/15/2005 and 1/36 of the remaining 4,687 shares subject to the Option shall vest on the 15th of each month thereafter, subject to the Optionee continuing to be a Participant of Komag Incorporated Amended and Restated 2002 Qualified Stock Plan on such dates. /s/ Jan Schwartz, Attorney-in-fact for Kathleen A. Bayless 2006-03-03