Kirby Corporation is a domestic tank barge operator. The Company transports bulk liquid products throughout the Mississippi River System, on the Gulf Intracoastal Waterway, and coastwise along all three United States coasts. The Company, through its marine transportation segment (KMT), transports petrochemicals, black oil, refined petroleum products, and agricultural chemicals by tank barge. It also participates in the transportation of dry-bulk commodities in the United States coastwise trade. Through its distribution and services segment (KDS), it sells 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. It also rents a variety of power generation and industrial equipment, manufactures and remanufactures oilfield service equipment, including pressure pumping units, and manufactures electric power generation equipment for oilfield service customers.