X0202 4 2005-05-12 0001069878 TREX CO INC TWP 0001105737 FERRARI ANDREW U 828 ARMISTEAD STREET WINCHESTER VA 22601 1 0 0 0 Common Stock 2005-05-12 2005-05-12 4 S 0 100 39.06 D 640877 D Common Stock 2005-05-12 2005-05-12 4 S 0 100 39.13 D 640777 D Common Stock 2005-05-12 2005-05-12 4 S 0 100 39.17 D 640677 D Common Stock 2005-05-12 2005-05-12 4 S 0 100 39.18 D 640577 D Common Stock 2005-05-12 2005-05-12 4 S 0 200 39.22 D 640377 D Common Stock 2005-05-12 2005-05-12 4 S 0 100 39.23 D 640277 D Common Stock 2005-05-12 2005-05-12 4 S 0 150 39.26 D 640127 D Common Stock 2005-05-12 2005-05-12 4 S 0 100 39.36 D 640027 D Common Stock 2005-05-12 2005-05-12 4 S 0 100 39.44 D 639927 D Common Stock 2005-05-12 2005-05-12 4 S 0 100 39.5 D 639827 D Common Stock 2005-05-12 2005-05-12 4 S 0 100 39.58 D 639727 D Does not include Indirect Beneficial Ownership of 850 shares by wife. Mr. Ferrari disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or any other purpose. Lynn E. MacDonald 2005-05-16