X0202 4 2006-03-23 0 0000813347 KOMAG INC /DE/ KOMG 0001230579 TAN THIAN H 1710 AUTOMATION PARKWAY SAN JOSE CA 95131 1 1 0 0 CEO Common Stock 2006-03-23 4 S 0 1000 48.1257 D 197927 D Common Stock 2006-03-23 4 S 0 977 48.2809 D 196950 D Common Stock 2006-03-23 4 S 0 1000 48.356 D 195950 D Common Stock 2006-03-23 4 S 0 1000 48.3915 D 194950 D Common Stock 2006-03-23 4 S 0 1000 48.4589 D 193950 D Common Stock 2006-03-23 4 S 0 1000 48.7024 D 192950 D Common Stock 2006-03-23 4 S 0 1000 48.8539 D 191950 D Common Stock 2006-03-23 4 S 0 1000 48.954 D 190950 D Common Stock 2006-03-23 4 S 0 1000 48.9559 D 189950 D Common Stock 2006-03-23 4 S 0 1000 49.0585 D 188950 D Common Stock 2006-03-23 4 S 0 1000 49.1043 D 187950 D Common Stock 2006-03-23 4 S 0 1000 49.1428 D 186950 D Common Stock 2006-03-23 4 S 0 1000 49.1896 D 185950 D Common Stock 2006-03-23 4 S 0 1000 49.2314 D 184950 D Common Stock 2006-03-23 4 S 0 1000 49.3151 D 183950 D Common Stock 2006-03-23 4 S 0 1000 49.4228 D 182950 D Common Stock 2006-03-23 4 S 0 1000 49.432 D 181950 D Common Stock 2006-03-23 4 S 0 1000 49.433 D 180950 D Common Stock 2006-03-23 4 S 0 1000 49.451 D 179950 D Common Stock 2006-03-23 4 S 0 1000 49.4668 D 178950 D Common Stock 2006-03-23 4 S 0 1000 49.5012 D 177950 D Common Stock 2006-03-23 4 S 0 1000 49.6722 D 176950 D Common Stock 2006-03-23 4 S 0 1000 49.7854 D 175950 D This trade was executed pursuant to a Rule 10b5-1 trading plan. /s/ Jan Schwartz, Attorney-in-fact for Thian Hoo Tan 2006-03-23