| Carrier Code | Carrier Name |
| MDAU | MEDAFRICA LINE S P A |
| MDCW | MADISON COAL & SUPPLY CO |
| MDMU | MIDMAC CONTRACTING INTERNATIONAL COMPANY |
| MDOQ | MCDERMOTT INC |
| MDPE | MED-PACIFIC EXPRESS |
| MDQN | MEDLINE SHIPPING LTD |
| MDSP | MODERNAGE SHIPPING COMPANY LIMITED |
| MDWG | MIDWEST TOWING CO INC |
| MECU | MELFI MARINE CORP |
| MEMA | METROSTAR MANAGEMENT CORP |
| MEPU | MCALISTER ENGINEERING SDN |
| MERU | MERRZARIO, ANDREA S P A |
| MESU | MEDITERRANEAN SHIPPING CO |
| MEVQ | MARITIME ENDEAVORS SHIPPING CO LTD |
| MEVU | MORCON BV |
