| Carrier Code | Carrier Name |
| UFTU | UNIVERSAL FREIGHT CARRIERS INC |
| UITE | UITERWYK, JAN C, CO INC |
| UIVU | UNIVSA LINES |
| UIWK | UITERWYK LINES C A |
| ULSC | ULS CORPORATION |
| UMAU | U S MARITIME AGENCIES |
| UMTC | ULTRA MARINE TRANSPORT CORP |
| UNBC | UNITED BARGE CO |
| UNCU | UNIVERSAL CONTAINER LTD |
| UNDM | UNIDEAL MANAGEMENT S A |
| UNDU | UNITAINER TRADING GMBH |
| UNEP | UNITED EXPORT |
| UNIS | UNISHIP |
| UNMD | UNIMODAL |
| UNMU | UNITED MARITIME |
