| 1 | MMBA | MI MAMAS TORTILLAS | | | SCAC4 |
| 2 | MMBC | M & M TRUCKING | | | SCAC4 |
| 3 | MMBE | MARK, MARTIN TRUCKING | | | SCAC4 |
| 4 | MMBJ | MOTORGRAPHIC | | | SCAC4 |
| 5 | MMBK | MMC TRANSPORT INC | | | SCAC4 |
| 6 | MMBL | MANUFACTURE DE MEUBLES VALENTINO IN | | | SCAC4 |
| 7 | MMBL | Montebello Municipal Bus Lines | | US-CA | TRAFFIC |
| 8 | MMBM | M & M TRUCKING | | | SCAC4 |
| 9 | MMBP | MORSE MOVING AND STORAGE INDIANAPOL | | | SCAC4 |
| 10 | MMBQ | MINTON MOTOR TRANSPORT INC | | | SCAC4 |
| 11 | MMBX | Master Builders, Inc. | added 10/1987; 1/1994; eliminated 10/1995; added 10/1996; eliminated 1/1997; 7/2000-7/2005 (not listed) | | NAKINA |
| 12 | MMBX | Martin Marietta Corp. | added 1/1979; 1/1980; eliminated 7/1986 | | NAKINA |
| 13 | MMBX | Martin Marietta Corp. | added 1/79; 1/80; eliminated 7/86 | | NRHS |
| 14 | MMBX | Master Builders, Inc. | added 10/87; 1/94; eliminated 10/95; added 10/96; eliminated 1/97; 7/2000 | | NRHS |
| 15 | MMBX | MARTIN MARIETTA CORPORATION [MASTER BUILDERS, INC.] | | | PWRC |
| 16 | MMBX | Martin Marietta Corporation (Master Builders) | | | RSRV |
| 17 | MMBX | MASTER BUILDERS, INC. | | | SCAC4 |
