WINCHESTER, Va.--(BUSINESS WIRE)--Trex Company, Inc. (NYSE:TREX), the world’s largest manufacturer of wood-alternative decking and railing products, today announced financial results for the first quarter ended March 31, 2015. Net sales for the first quarter of 2015 totaled $120.8 million, a 20% increase compared to net sales of $100.6 million for the 2014 period. The Company reported net income of $17.6 million, or $0.55 per diluted share, for the first-quarter of 2015 compared to net income o