Kirby Corp is a domestic tank barge operator, transporting bulk liquid products throughout three United States coasts. The Company transports petrochemicals, black oil, refined petroleum products, and agricultural chemicals by tank barge. The Company conducts operations in two reportable business segments: The Marine transportation segment which provides marine transportation services, operating tank barges and towing vessels transporting bulk liquid products, and the Distribution and services segment, which provides after-market service, and genuine replacement parts for engines, transmissions, reduction gears, and power generation equipment used in oil and gas and commercial and industrial applications. The company's revenue is generated from the Marine Transportation segment.