X0303 4 2010-02-18 0 0000060849 LUFKIN INDUSTRIES INC LUFK 0001256402 STEWART RICHARD ROSS PO BOX 849 LUFKIN TX 75902 1 0 0 0 Common Stock 2010-02-18 4 M 0 10000 45.80 A 10000 D Common Stock 2010-02-18 4 S 0 4338 76 D 5662 D Common Stock 2010-02-18 4 S 0 600 76.04 D 5062 D Common Stock 2010-02-18 4 S 0 200 76.15 D 4862 D Common Stock 2010-02-18 4 S 0 800 76.02 D 4062 D Common Stock 2010-02-18 4 S 0 100 76.0225 D 3962 D Common Stock 2010-02-18 4 S 0 100 76.024 D 3862 D Common Stock 2010-02-18 4 S 0 100 76.025 D 3762 D Common Stock 2010-02-18 4 S 0 1500 76.03 D 2262 D Common Stock 2010-02-18 4 S 0 200 73.0325 D 2062 D Common Stock 2010-02-18 4 S 0 400 76.035 D 1662 D Common Stock 2010-02-18 4 S 0 200 76.045 D 1462 D Common Stock 2010-02-18 4 S 0 200 76.0475 D 1262 D Common Stock 2010-02-18 4 S 0 500 76.05 D 762 D Common Stock 2010-02-18 4 S 0 100 76.06 D 662 D Common Stock 2010-02-18 4 S 0 300 76.0658 D 362 D Common Stock 2010-02-18 4 S 0 300 76.078 D 62 D Common Stock 2010-02-18 4 S 0 62 76.08 D 0 D Option to Purchase Common Stock 45.80 2009-08-05 4 M 0 10000 45.80 D 2009-08-05 2019-08-04 Common Stock 10000 0 D Richard R. Stewart 2010-02-18