Adams Resources & Energy, Inc.. The Group's principal activities are to market crude oil, natural gas and petroleum products, transport liquid chemicals and explore and produce oil and gas. Each activity is undertaken by a subsidiary of the Group. The subsidiary, Gulfmark Energy Inc, purchases crude oil and arranges transportation to refiners and other customers. Adams Resources Marketing Ltd operates as a wholesale purchaser, distributor and marketer of natural gas. Service Transport Company, transports liquid chemicals on a 'for hire' basis throughout the Continental United States and Canada. Transportation service is provided to over 400 customers under contracts and on a call and demand basis. Another subsidiary, Adams Resources Exploration Corporation, explores and develops domestic oil and gas properties primarily in the state of Texas. Petroleum marketing accounted for 98% of 2002 revenues; Transportation, 2% and Oil and Gas exploration, nominal.