Adams Resources & Energy, Inc., along with its subsidiaries, is engaged in the business of crude oil marketing, tank truck transportation of liquid chemicals, and oil and gas exploration and production. The Company's segments include Marketing Segment, Transportation Segment, and Oil and Gas Segment. The Company manages its Marketing Segment through its subsidiary, Gulfmark Energy, Inc., which is engaged in marketing of crude oil. It operates approximately 210 tractor-trailer rigs and maintains over 120 pipeline inventory locations or injection stations. The Company operates its Transportation Segment, through Service Transport Company, which transports liquid chemicals. Its Service Transport Company subsidiary operates over 320 truck tractors, of which over 290 are Company-owned with over 30 independent owner-operator units. The Oil and Gas Segment operates through Adams Resources Exploration Corporation subsidiary, which explores and develops domestic oil and natural gas properties.