The company has a number of subsidiaries:
Marine Transportation
Kirby Offshore Marine, LLC
Kirby Ocean Transport Company
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Osprey Line, LLC
San Jac Marine, LLC
Kirby Inland Marine, LP
Penn Maritime
Distribution and Services
United Holdings LLC
Stewart & Stevenson LLC
Stewart & Stevenson Power Products LLC
Stewart & Stevenson Manufacturing Technologies LLC
Stewart & Stevenson de las Americas Colombia, Ltda
Marine Systems, Inc
Engine Systems, Inc
United Engines, LLC
UE Manufacturing, LLC
Thermo King of Houston, LP
Thermo King of Dallas, LP
Other
Kirby Corporate Services, LLC
Kirby Terminals, Inc.
Kirby Logistics Management
Kirby Tankships, Inc.
KIM Holdings, Inc.
Sabine Transportation Company
AFRAM Carriers, Inc.
K Equipment, LLC