* Subsidiary organization
| 41 North Offshore, LLC 41 North Offshore, LLC | AEP River Transportation Division AEP River Transportation Division |
| Al Cenac Towing L.L.C. Al Cenac Towing L.L.C. | Alaska Marine Lines, Inc. Alaska Marine Lines, Inc. |
| American Commercial Barge Line LLC American Commercial Barge Line LLC | American River Transportation Company American River Transportation Company |
| Amherst Madison, Inc. Amherst Madison, Inc. | AmNav Maritime Corporation AmNav Maritime Corporation |
| Andrie Inc. Andrie Inc. | Avalon Freight Services LLC Avalon Freight Services LLC |
| Balico Marine Services LLC Balico Marine Services LLC | Baton Rouge Harbor Service, Inc. Baton Rouge Harbor Service, Inc. |
| Bay-Houston Towing Company Bay-Houston Towing Company | Baydelta Maritime Baydelta Maritime |
| Bellaire Harbor Service, LLC Bellaire Harbor Service, LLC | Blaha Towing Company LLC Blaha Towing Company LLC |
| Blessey Marine Services, Inc. Blessey Marine Services, Inc. | Boone Towing, Inc. Boone Towing, Inc. |
| Borghese Lane LLC Borghese Lane LLC | Brennan Marine, Inc. Brennan Marine, Inc. |
| Brown Water Marine Service, Inc. Brown Water Marine Service, Inc. | Brusco Tug & Barge, Inc. Brusco Tug & Barge, Inc. |
| Buffalo Marine Service, Inc. Buffalo Marine Service, Inc. | C & B Marine C & B Marine |
| C & J Marine Services, Inc. C & J Marine Services, Inc. | Calumet River Fleeting, Inc. Calumet River Fleeting, Inc. |
| Campbell Transportation Company, Inc. Campbell Transportation Company, Inc. | Canal Barge Company, Inc. Canal Barge Company, Inc. |
| Carline Management Company, Inc. Carline Management Company, Inc. | Cenac Marine Services, LLC Cenac Marine Services, LLC |
| 360 Coverage Pros Mariner Liability Insurance 360 Coverage Pros Mariner Liability Insurance | ABB Marine & Ports Inc. ABB Marine & Ports Inc. |
| AccuTrans, LLC AccuTrans, LLC | Acuity International Acuity International |
| Alliant Insurance Services, Inc. Alliant Insurance Services, Inc. | American Bureau of Shipping (ABS) American Bureau of Shipping (ABS) |
| American Steamship Owners Mutual P & I American Steamship Owners Mutual P & I | AON Risk Services AON Risk Services |
| ARCOSA Marine Products, Inc. ARCOSA Marine Products, Inc. | Arthur J. Gallagher & Co. Arthur J. Gallagher & Co. |
| Atlas Marine Services LLC (LA) Atlas Marine Services LLC (LA) | Bergan Marine Systems Bergan Marine Systems |
| Big River Shipbuilders, Inc. Big River Shipbuilders, Inc. | Bollard Marine Consulting Bollard Marine Consulting |
| Bollinger Shipyards, LLC Bollinger Shipyards, LLC | BP Shipping (USA) BP Shipping (USA) |
| Brown Brothers Harriman & Co. Brown Brothers Harriman & Co. | C & C Marine Repair C & C Marine Repair |
| Cadence CR Marine Cadence CR Marine | Caterpillar Inc. Caterpillar Inc. |
| Center for Toxicology and Environmental Health, LLC Center for Toxicology and Environmental Health, LLC | Channel Shipyard Company, Inc. Channel Shipyard Company, Inc. |
| Chevron Shipping Company Chevron Shipping Company | Citgo Petroleum Corporation Citgo Petroleum Corporation |
| ClassNK ClassNK | Conrad Shipyard, L.L.C. Conrad Shipyard, L.L.C. |
| Consolidated Grain & Barge, Inc. Consolidated Grain & Barge, Inc. | Cooper Consolidated, LLC Cooper Consolidated, LLC |
| Corvus Energy USA Corvus Energy USA | Cottrell Contracting Corporation Cottrell Contracting Corporation |
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