| TBS International plc (Ireland) |
| | TBS International Limited (Bermuda) |
| | TBS Holdings Limited (Bermuda) |
| | Westbrook Holdings Ltd. and its Subsidiaries (Marshall Islands) |
| | | Ablemarle Maritime Corp. - Mohawk Princess |
| | | Amoros Maritime Corp. - Hopi Princess |
| | | Arden Maritime Corp. - Tayrona Princess |
| | | Argyle Maritime Corp. - Rockaway Belle |
| | | Avon Maritime Corp. - Wichita Belle |
| | | Bedford Maritime Corp. - Apache Maiden |
| | | Beekman Shipping Corp. - Laguna Belle |
| | | Birnam Maritime Corp. - Sioux Maiden |
| | | Brighton Maritime Corp. - Kickapoo Belle |
| | | Bristol Maritime Corp. - Tuscarora Belle |
| | | Chatham Maritime Corp. - Zuni Princess |
| | | Chester Shipping Corp. - Tamoyo Maiden |
| | | Claremont Shipping Corp. - Arapaho Belle |
| | | Columbus Maritime Corp. - Seneca Maiden |
| | | Cumberland Navigation Corp. - Fox Maiden |
| | | Darby Navigation Corp. - Nyack Princess |
| | | Dover Maritime Corp. - Aztec Maiden |
| | | Dyker Maritime Corp. - Caribe Maiden |
| | | Elrod Shipping Corp. - Nanticoke Belle |
| | | Exeter Shipping Corp. - Alabama Belle |
| | | Fairfax Shipping Corp. - Seminole Princess |
| | | Frankfort Maritime Corp. - Shawnee Princess |
| | | Glenwood Maritime Corp. - Miami Maiden |
| | | Grainger Maritime Corp. - Ottawa Princess |
| | | Hancock Navigation Corp. - Kiowa Princess |
| | | Hansen Shipping Corp. - Ainu Princess |
| | | Hari Maritime Corp. - Navajo Princess |
| | | Hartley Navigation Corp. - Canarsie Princess |
| | | Henley Maritime Corp. - Tuckahoe Maiden |
| | | Hudson Maritime Corp. - Chesapeake Belle |
| | | Jessup Maritime Corp.- Savannah Belle |
| | | Lancaster Maritime Corp. - Mohave Maiden |
| | | Leaf Shipping Corp. - Management Company |
| | | Montrose Maritime Corp. - Yakima Princess |
| | | Oldcastle Shipping Corp. - Taino Maiden |
| | | Pacific Rim Shipping Corp. - Philippine |
| | | Prospect Navigation Corp. - Inca Maiden |
| | | Quentin Navigation Corp.- Houma Belle |
| | | Rector Shipping Corp. - Siboney Belle |
| | | Remsen Navigation Corp. - Maori Maiden |
| | | Sheffield Maritime Corp. - Manhattan Princess |
| | | Sherman Maritime Corp. - La Jolla Belle |
| | | Sherwood Shipping Corp. - Zia Belle |
| | | Sterling Shipping Corp. - Biloxi Belle |
| | | Stratford Shipping Corp. - Iroquois Maiden |
| | | Vedado Maritime Corp. - Tupi Maiden |
| | | Vernon Maritime Corp. - Mohegan Princess |
| | | Whitehall Marine Transport Corp. - Cherokee Princess |
| | | Windsor Maritime Corp. - Shinnecock Belle |
| | | Yorkshire Shipping Corp.- Oneida Princess |
| | | Caton Maritime Corp. - Dakota Princess (New Vessel Building) |
| | | Dorchester Maritime Corp. - Montauk Maiden (New Vessel Building) |
| | | Longwoods Maritime Corp. - (New Vessel Building) |
| | | McHenry Maritime Corp. - Omaha Belle (New Vessel Building) |
| | | Sunswyck Maritime Corp. (New Vessel Building) |
| | Transworld Cargo Carriers S.A. (Marshall Islands) |
| | TBS Worldwide Services, Inc. (Marshall Islands) |
| | | TBS African Ventures Limited |
| | | | GMTBS Africa line, Ltd (Hong Kong - 50%) |
| | | TBS Eurolines, Ltd. |
| | | TBS Latin America Liner, Ltd. |
| | | TBS Middle East Carriers, Ltd. |
| | | TBS North America Liner, Ltd. |
| | | TBS Ocean Carriers, Ltd. |
| | | TBS Pacific Liner, Ltd. |
| | Mercury Marine Ltd. (Marshall Islands) |
| | Roymar Ship Management, Inc. (New York) |
| | TBS Shipping Services Inc. (New York) |
| | | Compass Chartering Corp. (New York) |
| | | | Azalea Shipping & Chartering Inc. (New York) |
| | | TBS US Enterprises LLC (Delaware) |
| | | TBS Energy Logistics LP (Delaware) |
| | | TBS Logistics Incorporated (Texas) |
| | TBS Warehouse & Equipment Holdings Ltd. (Marshall Islands) |
| | | TBS Warehouse & Distribution Group Ltd. (Marshall Islands) |
| | | | Panamerican Port Services SAC (50% ownership) |
| | TBS Mining Limited (Marshall Islands) |
| | | GAT-TBS Consorcio S.A. (50% ownership) |
| | TBSI New Ship Development Corp. (Marshall Islands) |
