X0202 4 2005-07-25 0 0000060849 LUFKIN INDUSTRIES INC LUFK 0001185411 SMITH DOUGLAS V P. O. BOX 849 LUFKIN TX 75902 1 1 0 0 Chief Executive Officer Common Stock 2005-07-25 4 M 0 39700 11.288 A 65700 D Common Stock 2005-07-25 4 S 0 1000 49.4263 D 64700 D Common Stock 2005-07-25 4 S 0 3000 49.3584 D 61700 D Common Stock 2005-07-25 4 S 0 3500 49.3456 D 58200 D Common Stock 2005-07-25 4 S 0 1000 49.300 D 57200 D Common Stock 2005-07-25 4 S 0 1000 49.190 D 56200 D Common Stock 2005-07-25 4 S 0 3000 49.1659 D 53200 D Common Stock 2005-07-25 4 S 0 2500 49.100 D 50700 D Common Stock 2005-07-25 4 S 0 1500 48.98 D 49200 D Common Stock 2005-07-25 4 S 0 6000 48.90 D 43200 D Common Stock 2005-07-25 4 S 0 5000 48.86 D 38200 D Common Stock 2005-07-25 4 S 0 6000 48.75 D 32200 D Common Stock 2005-07-25 4 S 0 2500 48.74 D 29700 D Common Stock 2005-07-25 4 S 0 3700 48.00 D 26000 D Common Stock 2005-07-26 4 M 0 27008 11.288 A 53008 D Common Stock 2005-07-26 4 S 0 18008 47.00 D 35000 D Common Stock 2005-07-26 4 S 0 1000 47.053 D 34000 D Common Stock 2005-07-26 4 S 0 8000 48.00 D 26000 D Option to Purchase Common Stock 11.288 2005-07-25 4 M 0 39700 11.288 D 2002-02-27 2012-02-27 Common Stock 39700 267856 D Option to Purchase Common Stock 11.288 2005-07-26 4 M 0 27008 11.288 D 2002-02-27 2012-02-27 Common Stock 27008 240848 D Douglas V. Smith 2005-07-27