| M & R TRUCKING INC OF WISCONSINJanesville, WI | 1233360 | 6 |
| M & Y TRANSPORTATION LLCBarron, WI | 3952140 | 6 |
| M&G TOWING & TRANSPORTATION LLCGreen Bay, WI | 4529989 | 1 |
| M-BAH LOGISTICS LLCSun Prairie, WI | 3260201 | 1 |
| MACHINERY INSTALLATION SERVICE INCPewaukee, WI | 1061145 | 4 |
| MADISON LIGHTING LTDMadison, WI | 1608134 | 1 |
| MADSON TRUCKING INCManitowoc, WI | 1001762 | 10 |
| MAIER TRANSPORT LLCRiver Falls, WI | 1609768 | 1 |
| MAMA RAHEALS TRUCKING LLCMadison, WI | 3871320 | 2 |
| MARC ROBERT DUDGEONIxonia, WI | 679320 | 2 |
| MARENGO VALLEY TRANSPORT LLCHighbridge, WI | 1446154 | 4 |
| MARINETTE FUEL & DOCK COMPANYMarinette, WI | 429730 | 5 |
| MARION LEE SHORTEau Claire, WI | 2087990 | 2 |
| MARTEN TRANSPORT LTDMondovi, WI | 74432 | 3794 |
| MARTINEZ TRANSPORT LLCColumbus, WI | 4444145 | 1 |
| MARTINS BULK MILK SERVICE INCWilton, WI | 222274 | 211 |
| MATHEWS ENTERPRISES INCElkhorn, WI | 48226 | 2 |
| MATTHEW RAYMOND CASPERAlma Center, WI | 1280896 | 8 |
| MB BROS TRUCKING LLCMilwaukee, WI | 2941207 | 7 |
| MBTC LLCMilwaukee, WI | 2524785 | 2 |
| MC RAE'S U S MAIL SERVICE INCWest Allis, WI | 484946 | 190 |
| MCCORMICK AND MCCORMICK INCKennan, WI | 74436 | 14 |
| MCGANN CONSTRUCTION INCMadison, WI | 898802 | 3 |
| MCK EXPRESS INCPrinceton, WI | 3390952 | 1 |
| MDAT INCKenosha, WI | 3083247 | 15 |
| ME TRANSPORT INCMilwaukee, WI | 3018646 | 1 |
| MEGA STAR INCRacine, WI | 3329989 | 80 |
| MELISSA TRUCKING LLCMilwaukee, WI | 1655815 | 6 |
| MENZEL ENTERPRISES INCSun Prairie, WI | 840949 | 28 |
| MEYER BROS LLCElk Mound, WI | 1601959 | 13 |
| MEYER TRANSPORT LLCOconto, WI | 1434190 | 4 |
| MICHAEL E DURYGreen Bay, WI | 2630091 | 4 |
| MICHEK TRANSPORTATION LLCHighland, WI | 1228969 | 4 |
| MIDNIGHT DREAMS TRANSPORT LLCPortage, WI | 4177503 | 1 |
| MIDWEST INDUSTRIAL FUELS INCLa Crosse, WI | 640063 | 107 |
| MIDWEST REFRIGERATED TRANSPORT INCMilwaukee, WI | 1772901 | 111 |
| MIDWEST SKIPS LLCKenosha, WI | 4344068 | 3 |
| MIGUEL ROQUE GARCIAMilwaukee, WI | 1382267 | 3 |
| MILLER ELECTRIC MANUFACTURING LLCAppleton, WI | 585827 | 35 |
| MILLIS TRANSFER LLCBlack River Falls, WI | 46749 | 583 |
| MJ SERVICES LLCMuskego, WI | 3579555 | 10 |
| MKE MOBILITY LLCMilwaukee, WI | 4522691 | 1 |
| MMM PRIME INCWisc Dells, WI | 3699247 | 2 |
| MNQ LOGISTICS LLCCudahy, WI | 3417530 | 1 |
| MNTAJ TRANSPORT INCStevens Point, WI | 2581938 | 42 |
| MOONLIGHTING EXPRESS INCAdams, WI | 522256 | 4 |
| MOOVE NA TRANSPORT INCSuperior, WI | 226518 | 401 |
| MORRISTOWN EXPRESS INCGreen Bay, WI | 1496836 | 30 |
| MOSER TRUCKING INCViroqua, WI | 1314359 | 12 |
| MOVINGYOURLOADS LLCMilwaukee, WI | 4393232 | 1 |
| MPD TRANSPORT & RECYCLING LLCWaupaca, WI | 1760442 | 20 |
| MR SINGH TRANSPORTATION LLCOak Creek, WI | 3607201 | 1 |
| MRX LOGISTICS INCSouth Milwaukee, WI | 1820230 | 6 |
| MTI TRANSPORTATION LLCGreen Bay, WI | 4004201 | 2 |
| MUSSON BROS INCRhinelander, WI | 451502 | 198 |
| MUTHONIS & SONS LLCManitowoc, WI | 4279688 | 1 |
| MVMM LOGISTICS LLCWaukesha, WI | 4566022 | 1 |
| MW INDUSTRIES OF WISCONSINMadison, WI | 1650745 | 4 |
| MYSTIC TRANSPORT INCWaterford, WI | 46639 | 1 |