| S & S TRANSPORT LLCBeloit, WI | 736196 | 19 |
| S-N-T BRINKMAN TRANSFER LLCCassville, WI | 3059256 | 1 |
| SADLER'S HAULING LLCCurtiss, WI | 2472622 | 1 |
| SADOFF & RUDOY TRANSPORT LLCFond Du Lac, WI | 114175 | 54 |
| SAGEPOINT ENERGY LOGISTICS LLCDe Pere, WI | 2635761 | 79 |
| SAND CANYON TRUCKING & REPAIR LLCElroy, WI | 4281240 | 1 |
| SANDHU TRANSPORT LLCGermantown, WI | 3921026 | 1 |
| SANIAK EXPRESS LOGISTICS LLCMadison, WI | 3943652 | 2 |
| SARGENTO TRANSPORTATION LLCPlymouth, WI | 1429548 | 44 |
| SBT TRUCKING LLCArgonne, WI | 2397629 | 7 |
| SCA INCElkhart Lake, WI | 1125141 | 5 |
| SCANLAN TRANSPORTATION SERVICES LLCHudson, WI | 3006325 | 11 |
| SCHALLER TRUCKING LLCKiel, WI | 2338710 | 18 |
| SCHELLINGER FIELD SERVICE LLCWest Bend, WI | 3889263 | 1 |
| SCHNEIDER NATIONAL BULK CARRIERS INCGreen Bay, WI | 164311 | 569 |
| SCHNEIDER NATIONAL CARRIERS INCGreen Bay, WI | 264184 | 9866 |
| SCHNEIDER TRANSPORT INCGreen Bay, WI | 46596 | 4 |
| SCHROEDER ENVIRONMENTAL CLEANING SERVICES INCGreen Bay, WI | 614756 | 23 |
| SCHULTZ TRANSFER SYSTEMS INCOak Creek, WI | 747347 | 2 |
| SCHWARZ FISH COMPANYSheboygan, WI | 46415 | 4 |
| SCHWERMAN TRUCKING COMPANYMilwaukee, WI | 46595 | 275 |
| SCOTT ALLEN RAVENSCROFTNecedah, WI | 1686941 | 13 |
| SEERAT TRANSPORTATION LLCMilwaukee, WI | 4002267 | 1 |
| SELECT INDUSTRY INCStone Lake, WI | 794180 | 1 |
| SELECT TRANSPORT INCStone Lake, WI | 1606127 | 20 |
| SENECA FOODS CORPORATIONJanesville, WI | 19528 | 15 |
| SERVICE ONE TRANSPORTATION INCPlymouth, WI | 694138 | 45 |
| SF TRANSPORT LLCLoyal, WI | 256594 | 15 |
| SHAN LOGISTICS INCMadison, WI | 3834335 | 1 |
| SHARDI LOGISTICS LLCMadison, WI | 3216138 | 2 |
| SHARED MEDICAL EQUIPMENT GROUP LLCCottage Grove, WI | 794586 | 105 |
| SHAWN T CASSIDYBerlin, WI | 3117738 | 1 |
| SHEEHY EXPRESS INCWaterloo, WI | 2517265 | 38 |
| SHEEHY MAIL CONTRACTORS INCMadison, WI | 83820 | 506 |
| SHEFLAND TRUCKING SERVICE INCBaldwin, WI | 74467 | 30 |
| SHORTHORN LLCWauwatosa, WI | 3856749 | 110 |
| SILVER INDUSTRIES LLCFranklin, WI | 3350750 | 50 |
| SKAW PRE-CAST COMPANY TRANSIT INCNew Auburn, WI | 994357 | 8 |
| SKF TRUCKING LLCMadison, WI | 3320665 | 9 |
| SKINNER TRANSFER CORPReedsburg, WI | 74466 | 104 |
| SND TRUCKING LLCWaukesha, WI | 2549388 | 16 |
| SOGDIANA TRANS CORPWaupun, WI | 3582569 | 2 |
| SOLDIER TRUCKING LLCMenomonie, WI | 1460059 | 53 |
| SOLID LINE LOGISTICS INCOconomowoc, WI | 4175987 | 4 |
| SOLON SPRINGS CONCRETE LLCSolon Springs, WI | 1594931 | 27 |
| SON AUTO TRANSPORT INCPrairie Farm, WI | 1788663 | 1 |
| SOUTHERN COUNTRY TRANSPORTATION LLCManitowoc, WI | 4318007 | 1 |
| SOWINSKI TRUCKING LLCRhinelander, WI | 46473 | 30 |
| SP TRANSPORT LLCAmery, WI | 3060848 | 3 |
| SPARTEK INCSparta, WI | 46538 | 1 |
| SPECIALIZED AUTO LLCWaukesha, WI | 1811062 | 3 |
| SPOERL TRUCKING INCIxonia, WI | 543340 | 98 |
| SPRINGBROOK EXPRESS LLCNew Auburn, WI | 1682700 | 92 |
| SRK TRUCKING INCFranklin, WI | 4335840 | 2 |
| ST JOE EXPRESS INCGreen Bay, WI | 1015497 | 42 |
| STACK BROS MECHANICAL CONTRACTORS INCSuperior, WI | 1280175 | 134 |
| STANDART TRANSPORTATION LLCMilwaukee, WI | 4232644 | 1 |
| STAR LINE TRUCKING CORPORATIONNew Berlin, WI | 46587 | 56 |
| STAR SHINE LOGISTICS INCKenosha, WI | 4143732 | 1 |
| STARLIFT EXPRESS LLCGreen Bay, WI | 4181046 | 18 |
| STERLING TRANSPORTATION LLCKenosha, WI | 3263825 | 4 |
| STERMAN SERVICES LLCHartford, WI | 774669 | 5 |
| STEVE'S CAR & TRUCK SERVICE INCLake Mills, WI | 326025 | 7 |
| STEVENS GRAIN SERVICE INCHill Point, WI | 46526 | 3 |
| STK TRANSPORTATION LLCFond Du Lac, WI | 1587321 | 2 |
| STL TRANSPORTATION INCGreen Bay, WI | 2537644 | 1 |
| STOWELL TRUCKING INCBurlington, WI | 46366 | 2 |
| STRADAS TRUCKING LLCWest Allis, WI | 4268906 | 2 |
| STRAIGHT FREIGHT LLCHales Corners, WI | 3915833 | 1 |
| STRAKAFELLER TRUCKING LLCSun Prairie, WI | 1750248 | 2 |
| STROLLIN WEST LLCManitowoc, WI | 1041070 | 16 |
| STRUCTURAL COMPONENTS CORPORATIONGreen Bay, WI | 46362 | 2 |
| STURM FOODS INCManawa, WI | 46356 | 4 |
| STURZHAUF LLCGreen Bay, WI | 4227026 | 2 |
| SUCHLA TRUCKING LLCArcadia, WI | 3935081 | 2 |
| SUMMIT TRUCKING LLCFoxboro, WI | 3820906 | 2 |
| SUNLAND EXPRESS LLCGreen Bay, WI | 3759424 | 5 |
| SUPERIOR FUEL COMPANYSpooner, WI | 1514846 | 48 |
| SUZAN TRUCKING INCRadisson, WI | 996169 | 7 |
| SWANT TOWING LLCRice Lake, WI | 2143948 | 8 |
| SWIDERSKI TRANSPORT LLCWausau, WI | 1801412 | 8 |
| SYBROS LOGISTICS LLCSun Prairie, WI | 3344431 | 1 |