| 1 | MOC | Air Monacrch Cargo, S.A. de C.V. | Callsign: Monarch Cargo, | MEX | AVCODES |
| 2 | MOC | Aero Marat, S.A. de C.V. | Callsign: Aeromarat, | MEX | AVCODES |
| 3 | MOC | Air Monarch Cargo | | | ICAO1 |
| 4 | MOC | Missouri Central R.R. Co. | 7/2000-7/2005 | | NAKINA |
| 5 | MOC | Missouri Central R.R. Co. | Jul-00 | | NRHS |
| 6 | MOC | MISSOURI CENTRAL RAILROAD | | | PWRC |
| 7 | MOC | Missouri Central Railroad | | | RSRV |
| 8 | MOC | MISSOURI CENTRAL RAILROAD COMPANY | | | SCAC4 |
| 9 | MOCA | MARTIN OIL COMPANY INC | | | SCAC4 |
| 10 | MOCB | MUTCH OIL CO OF GRAND FORKS INC | | | SCAC4 |
| 11 | MOCD | MATSON OIL COMPANY INC | | | SCAC4 |
| 12 | MOCG | MORFINI SPA | | | SCAC4 |
| 13 | MOCI | MEYERS OIL COMPANY INC | | | SCAC4 |
| 14 | MOCK | MONSON TRUCK LINE INC | | | SCAC4 |
| 15 | MOCL | Montgomery City Lines | City: Montgomery, AL | USA | TRAFFIC |
| 16 | MOCN | MURPHY OIL COMPANY INCORPORATED | | | SCAC4 |
| 17 | MOCO | MCINTOSH OIL CO INC | | | SCAC4 |
| 18 | MOCP | MORAN, CHRISTIAN TRANSPORT | | | SCAC4 |
| 19 | MOCR | MCGILLVREY OIL CO INC | | | SCAC4 |
| 20 | MOCU | MACS MARITIME CARRIER SHIPPING GMBH & CO | | D | BIC |
| 21 | MOCU | MACS MARITIME CARRIER SHIPPING GMBH | | | SCAC4 |
| 22 | MOCX | The Mosaic Co. | added 1/2010 | | NAKINA |
| 23 | MOCX | Missouri Portland Cement Co. | 1/1941; 4/1947-1/1980; eliminated 10/1984 | | NAKINA |
| 24 | MOCX | Missouri Portland Cement Co. | 1/52-1/80; eliminated 10/84 | | NRHS |
| 25 | MOCX | MISSOURI PORTLAND CEMENT COMPANY | | | PWRC |
| 26 | MOCX | Missouri Portland Cement | | | RSRV |
| 27 | MOCX | MOSAIC COMPANY, THE | | | SCAC4 |
| 28 | MOCZ | MURPHY OIL COMPANY | | | PWRC |
