Kirby operates the largest inland and offshore tank barge fleets in the United States.  Kirby’s marine transportation services include the distribution of petrochemicals, black oil, refined petroleum products and agricultural chemical products by inland and offshore tank barge. In addition, Kirby participates in the transportation of dry-bulk commodities in United States coastwise trade.

Kirby is also a leading distributor and services provider to industrial markets, offering customers a single source for after-market service and parts for engines, transmissions, reduction gears, and related equipment used in oilfield services, marine, power generation, on-highway, and other industrial applications.
In marine and power generation applications, Kirby provides after-market service for medium-speed and high-speed engines, reduction gears and ancillary products. In the oilfield services and land-based pressure pumping markets, Kirby serves as a distributor and service provider for high-speed diesel engines, transmissions, and pumps, and manufactures and remanufactures oilfield service equipment, including pressure pumping units.  Kirby also rents equipment including generators, forklifts, pumps, and compressors for use in a variety of industrial markets.