Kirby Corporation

Cenac Marine Services LLC is a marine facility that provides a range of services primarily to major oil companies and refineries. The company specializes in transporting crude oil, residual fuels, lubricants, petrochemicals, and liquefied petroleum gases (LPGs). In addition to its transportation services, Cenac Marine is involved in marine construction, coastal towage, and civil engineering support. The company is also recognized for its innovative approach in the marine industry, focusing on the construction, repair, repowering, and maintenance of advanced push boats and tank barges that operate within the United States inland waterways system.

Higman Marine Services provides inland marine transportation services for bulk liquid petroleum and chemical cargoes. It owns and operates a fleet of vessels, including push boats and tank barges that transport refined petroleum products, crude oil, condensates, black oil products, chemicals and petrochemicals on the Gulf Intracoastal Waterway and the Mississippi River System, such as Arkansas, Illinois, Missouri, Ohio, Tennessee, Black Warrior Rivers, and the Tennessee-Tombigbee waterway.

Stewart & Stevenson is a privately held manufacturer and distributor of products and services for the oil and gas, marine, construction, power generation, transportation, mining and agricultural industries.

Maritime Investments operates tank barges and tugboats for transporting black oil products.

Penn Maritime specializes in the transportation of petroleum products along the East Coast and Gulf Coast of the United States. The company operates a fleet of 18 heated, double-hulled tank barges with a total capacity of 1.9 million barrels, alongside 16 tugboats. The average age of the tank barge fleet is approximately 13 years, and the product mix primarily includes refinery feedstocks, asphalt, and crude oil. Penn Maritime serves a diverse clientele, which includes major oil companies and refiners, many of whom are also customers of Kirby for inland tank barge services.

Allied Transportation is a privately held company engages in towing and tugboat services.

K-Sea Transportation Partners LLC, headquartered in East Brunswick, New Jersey, is a leading provider of marine transportation, distribution and logistics services in the U.S. From locations in New York, Philadelphia, Norfolk, Seattle and Honolulu, K-Sea operates a large fleet of tugs and tank barges that serves a wide range of customers, including major oil companies, oil traders and refiners.

United Holdings is a renewable energy company that offers solutions and supports the oil and gas services, power generation, and transportation industries. It specializes in providing access to custom equipment, reliable products, and unrivaled customer service. The company was founded in 1938 and headquartered in Shreveport, Louisiana.

Global Power Systems operates factory-authorized full service marine market dealerships for Cummins, Detroit Diesel and John Deere high-speed diesel engines, as well as Allison transmissions. Global is also an authorized marine dealer for Caterpillar in Louisiana.

Marine Systems provides diesel engine and reduction gear repair services and remanufacturing and replacement parts.