X0303 4 2010-11-19 0 0000060849 LUFKIN INDUSTRIES INC LUFK 0001185411 SMITH DOUGLAS V P. O. BOX 849 LUFKIN TX 75902 1 0 0 0 Common Stock 2010-11-19 4 M 0 10000 30.485 A 30000 D Common Stock 2010-11-19 4 S 0 7300 50.00 D 22700 D Common Stock 2010-11-19 4 S 0 500 50.01 D 22200 D Common Stock 2010-11-19 4 S 0 700 50.02 D 21500 D Common Stock 2010-11-19 4 S 0 1400 50.04 D 20100 D Common Stock 2010-11-19 4 S 0 100 50.05 D 20000 D Common Stock 2010-11-19 4 M 0 10000 30.485 A 30000 D Common Stock 2010-11-22 4 S 0 1100 50.00 D 28900 D Common Stock 2010-11-22 4 S 0 200 50.01 D 28700 D Common Stock 2010-11-22 4 S 0 200 50.06 D 28500 D Common Stock 2010-11-22 4 S 0 400 50.064 D 28100 D Common Stock 2010-11-22 4 S 0 100 50.14 D 28000 D Common Stock 2010-11-22 4 S 0 537 50.15 D 27463 D Common Stock 2010-11-22 4 S 0 200 50.17 D 27263 D Common Stock 2010-11-22 4 S 0 1200 50.19 D 26063 D Common Stock 2010-11-22 4 S 0 1200 50.21 D 24863 D Common Stock 2010-11-22 4 S 0 1200 50.23 D 23663 D Common Stock 2010-11-22 4 S 0 1400 50.25 D 22263 D Common Stock 2010-11-22 4 S 0 663 50.30 D 21600 D Common Stock 2010-11-22 4 S 0 1500 50.36 D 20100 D Common Stock 2010-11-22 4 S 0 100 50.37 D 20000 D Option to Purchase Common Stock 30.485 2010-11-19 4 M 0 10000 30.485 D 2008-02-13 2017-02-13 Common Stock 10000 119000 D Option to Purchase Common Stock 30.485 2010-11-22 4 M 0 10000 30.485 D 2008-02-13 2017-02-13 Common Stock 10000 109000 D Douglas V. Smith 2010-11-23