| M & K TOURS CORPDedham, MA | 2839696 | 2 |
| M & S EXPRESS INCNorth Reading, MA | 15105 | 8 |
| M & X UTILITY COMPANY INCLynn, MA | 1124722 | 7 |
| M KORSON & CO INCSomerville, MA | 24472 | 20 |
| MA LOGISTICS LLCFalmouth, MA | 3560256 | 33 |
| MACHAD'S LOGISTICS EXPRESS LLCLowell, MA | 4408562 | 1 |
| MAGALHAES INCNew Bedford, MA | 18446 | 6 |
| MAGAN EXPRESS LLCWorcester, MA | 3142903 | 1 |
| MAINE LINE LLCSpringfield, MA | 1080989 | 32 |
| MAKE TRUCKING LLCQuincy, MA | 3790644 | 2 |
| MALCOLM ELITE TRUCKING LLCFalmouth, MA | 4417717 | 1 |
| MALUCKY EXPRESS INCFitchburg, MA | 4203221 | 1 |
| MANNYGOOSE TRUCKING CORPWest Bridgewat, MA | 3173231 | 1 |
| MANZUETA AUTO SALES & TOWING LLCLeominster, MA | 4047006 | 7 |
| MARCO A LOPEZ NIZLynn, MA | 4382645 | 2 |
| MARTELL MOTOR EXPRESS INCTyngsboro, MA | 15123 | 6 |
| MARTINEAU GARAGE INCMethuen, MA | 15126 | 16 |
| MASS HAULING AND CAR TRANSPORT LLCSpringfield, MA | 3135268 | 1 |
| MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANYSpringfield, MA | 639087 | 8 |
| MASSINI BUS COMPANY INCSheffield, MA | 515779 | 24 |
| MAVERICK FREIGHT LLCNew Bedford, MA | 4037854 | 1 |
| MAVERICK SERVICES LLCBrockton, MA | 3508789 | 1 |
| MBT WORLDWIDE INCTewksbury, MA | 1331951 | 28 |
| MCALISTER OIL LLCStoughton, MA | 3763729 | 95 |
| MCGINN BUS COMPANY INCLynn, MA | 18432 | 15 |
| MCO EXPRESS LLCLowell, MA | 3511181 | 1 |
| MEDINA MOVEMENT LLCLynn, MA | 4351433 | 1 |
| MENAS TRANSPORT INCMalden, MA | 4327075 | 2 |
| MERRIMACK SNACKS LLCLawrence, MA | 8226755 | 2 |
| MERRIMACK VALLEY APIARIES INCBillerica, MA | 18115 | 5 |
| METROPOLITAN PIPE & SUPPLY COMPANYSomerville, MA | 18022 | 15 |
| MICHAEL IRVINGEast Weymouth, MA | 3489364 | 1 |
| MICHAEL K DONOVANCherry Valley, MA | 4269345 | 1 |
| MICHAEL'S LIMOUSINE COMPANY INCPeabody, MA | 2175746 | 10 |
| MICHAEL'S MOVING AND STORAGE INCAllston, MA | 608571 | 14 |
| MIMA TRANSPORT LLCAshland, MA | 4302446 | 4 |
| MIW CORPORATIONFall River, MA | 512797 | 10 |
| MK TOUR INCRandolph, MA | 2513602 | 6 |
| MM CARRIER INCMarlborough, MA | 2800332 | 6 |
| MMA TRANSPORT INCW Springfield, MA | 3715497 | 2 |
| MOISE EXPRESS LLCBrockton, MA | 3770230 | 1 |
| MORNING SUN BUS COMPANY INCRockland, MA | 1189020 | 17 |
| MOZART MOVING INCWest Roxbury, MA | 2583086 | 7 |
| MR B'S TRUCKING TRANSPORT LLCAgawam, MA | 4267066 | 1 |
| MR TRUCKING LOGISTICS LLCDalton, MA | 4135148 | 2 |
| MSD LOGISTICS LLCLowell, MA | 4526834 | 1 |
| MUESKES LANDSCAPING LLCMethuen, MA | 1854772 | 13 |
| MYSTIC MOTOR TRANSP COMPANY INCBillerica, MA | 19148 | 14 |