X0202 4 2006-02-17 0 0000813347 KOMAG INC /DE/ KOMG 0001343018 JUDY PAUL G 1710 AUTOMATION PARKWAY SAN JOSE CA 95131 0 1 0 0 VP, CORPORATE CONTROLLER & CAO Common Stock 2006-02-17 4 M 0 1584 12.68 A 12381 D Common Stock 2006-02-17 4 S 0 144 48.55 D 12237 D Common Stock 2006-02-17 4 S 0 100 48.56 D 12137 D Common Stock 2006-02-17 4 S 0 300 48.57 D 11837 D Common Stock 2006-02-17 4 S 0 370 48.60 D 11467 D Common Stock 2006-02-17 4 S 0 100 48.64 D 11367 D Common Stock 2006-02-17 4 S 0 200 48.65 D 11167 D Common Stock 2006-02-17 4 S 0 500 48.68 D 10667 D Common Stock 2006-02-17 4 S 0 151 48.69 D 10516 D Common Stock 2006-02-17 4 S 0 500 48.70 D 10016 D Common Stock 2006-02-17 4 S 0 233 48.74 D 9783 D Common Stock 2006-02-17 4 S 0 500 48.76 D 9283 D Common Stock 2006-02-17 4 S 0 200 48.78 D 9083 D Non-Qualified Stock Option (right to buy) 12.68 2006-02-17 4 M 0 1584 0.00 D 2014-04-30 Common Stock 1584 4753 D The Reporting Person exercised 1,584 shares of the 8,450 share option granted on 04/30/2004, of which 2,113 shares subject to the Option shall vest on 04/30/2005 and 1/36 of the remaining 6,337 shares subject to the Option shall vest monthly 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 Paul G. Judy 2006-02-17