| SIShiloh Industries LLC Galesburg | Galesburg | MI | Transportation Equipment Manufacturing336111 | 100-499 | ◐ LIKELY ACTIVE |
| SLSigmathink LLC | Ann Arbor | MI | Transportation Equipment Manufacturing336211 | — | ◐ LIKELY ACTIVE |
| SSSilver Star Consulting LLC | East Lansing | MI | Transportation Equipment Manufacturing336992 | — | ◐ LIKELY ACTIVE |
| SNSKF North American Technical Center | Plymouth | MI | Transportation Equipment Manufacturing336212 | 100-499 | ◐ LIKELY ACTIVE |
Skilled Manufacturing - Aerospace Division | Traverse City | MI | Transportation Equipment Manufacturing336412 | 100-499 | ◐ LIKELY ACTIVE |
Skilled Manufacturing - Automotive Division (2) | Traverse Ctiy | MI | Transportation Equipment Manufacturing336310 | 20-99 | ◐ LIKELY ACTIVE |
| SASodecia Automotive Detroit Corp. | Center Line | MI | Transportation Equipment Manufacturing336211 | 100-499 | ◐ LIKELY ACTIVE |
| SASodecia Automotive Detroit Corp. | Roseville | MI | Transportation Equipment Manufacturing336211 | 20-99 | ◐ LIKELY ACTIVE |
| SSouthview | Holland | MI | Transportation Equipment Manufacturing336360 | 500+ | ◐ LIKELY ACTIVE |
| SMSpencer Manufacturing, INC. | South Haven | MI | Transportation Equipment Manufacturing336999 | — | ◐ LIKELY ACTIVE |
| SLSpring Lake | Spring Lake | MI | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
| STStealth Trailers | Sturgis | MI | Transportation Equipment Manufacturing336214 | 20-99 | ◐ LIKELY ACTIVE |
| SDSteed Diane | Rapid City | MI | Transportation Equipment Manufacturing336992 | — | ◐ LIKELY ACTIVE |
| SHSterling Heights Complex | Sterling Heights | MI | Transportation Equipment Manufacturing336992 | 500+ | ◐ LIKELY ACTIVE |
| SHSterling Heights Stamping | Sterling Heights | MI | Transportation Equipment Manufacturing336370 | 500+ | ◐ LIKELY ACTIVE |
| SPSunsation Products, Inc. | Ira Twp | MI | Transportation Equipment Manufacturing336612 | 20-99 | ◐ LIKELY ACTIVE |
| TITechnique, Inc. Micor Drive | Jackson | MI | Transportation Equipment Manufacturing336390 | 20-99 | ◐ LIKELY ACTIVE |
| TITechnique, Inc. Research Drive | Jackson | MI | Transportation Equipment Manufacturing336370 | 1-19 | ◐ LIKELY ACTIVE |
| TITecNiq, Inc | Galesburg | MI | Transportation Equipment Manufacturing336320 | 100-499 | ◐ LIKELY ACTIVE |
| T9Tenneco 929 Anderson Road, Litchfield, MI | Litchfield | MI | Transportation Equipment Manufacturing336390 | 100-499 | ◐ LIKELY ACTIVE |
| TATenneco Automotive | Grass Lake | MI | Transportation Equipment Manufacturing336390 | 100-499 | ◐ LIKELY ACTIVE |
| TGTenneco, Greenville | Greenville | MI | Transportation Equipment Manufacturing336310 | 100-499 | ◐ LIKELY ACTIVE |
| TITenneco Inc. - Lansing MI Clean Air Division | Lansing | MI | Transportation Equipment Manufacturing336390 | 100-499 | ◐ LIKELY ACTIVE |
The Shyft Group | Novi | MI | Transportation Equipment Manufacturing336211 | 20-99 | ◐ LIKELY ACTIVE |
| TMThree Mile | Grand Rapids | MI | Transportation Equipment Manufacturing336370 | 100-499 | ◐ LIKELY ACTIVE |
| TFTI Fluid Systems - New Haven | New Baltimore | MI | Transportation Equipment Manufacturing336310 | 20-99 | ◐ LIKELY ACTIVE |
| TTTrailer Tecnologies Holdings LLC | Wixom | MI | Transportation Equipment Manufacturing336212 | 100-499 | ◐ LIKELY ACTIVE |
| TATransform Automotive - Shelby | Shelby Township | MI | Transportation Equipment Manufacturing336370 | 20-99 | ◐ LIKELY ACTIVE |
| TLTransign, LLC | Auburn Hills | MI | Transportation Equipment Manufacturing336320 | — | ◐ LIKELY ACTIVE |
| TPTrend Performance Products | Warren | MI | Transportation Equipment Manufacturing336310 | 20-99 | ◐ LIKELY ACTIVE |
| TSTrenton South Engine Complex | Trenton | MI | Transportation Equipment Manufacturing336310 | 500+ | ◐ LIKELY ACTIVE |
| TGTriumph Geared Solutions - Macomb | Macomb | MI | Transportation Equipment Manufacturing336413 | 100-499 | ◐ LIKELY ACTIVE |
| TTTruck & Trailer Specialties - Boyne Falls Location | Boyne Falls | MI | Transportation Equipment Manufacturing336211 | 20-99 | ◐ LIKELY ACTIVE |
Truform Machine INC. | Jackson | MI | Transportation Equipment Manufacturing336413 | — | ◐ LIKELY ACTIVE |
| TITrynex International | Madison Heights | MI | Transportation Equipment Manufacturing336212 | 100-499 | ◐ LIKELY ACTIVE |
| TOTurn One, INC. | Saginaw | MI | Transportation Equipment Manufacturing336330 | — | ◐ LIKELY ACTIVE |
| ULUltra-prop LLC | Holly | MI | Transportation Equipment Manufacturing336413 | — | ▲ REPORTED CLOSED |
| USUniversal Stamping, Inc. | Benton Harbor | MI | Transportation Equipment Manufacturing336370 | 20-99 | ◐ LIKELY ACTIVE |
| UMUS MI Grand Rapids 25 Ottawa | Grand Rapids | MI | Transportation Equipment Manufacturing336390 | 20-99 | ◐ LIKELY ACTIVE |
| UMUS MI Grand Rapids 355 Cottage Grove | Grand Rapids | MI | Transportation Equipment Manufacturing336390 | 20-99 | ◐ LIKELY ACTIVE |
| UMUS MI Holland 11768 James St | Holland | MI | Transportation Equipment Manufacturing336390 | 500+ | ◐ LIKELY ACTIVE |
| UMUS MI Holland 16th Street | Holland | MI | Transportation Equipment Manufacturing336390 | 20-99 | ◐ LIKELY ACTIVE |
| UMUS MI Zeeland 220 Riley St | Zeeland | MI | Transportation Equipment Manufacturing336390 | 100-499 | ◐ LIKELY ACTIVE |
| UMUS MI Zeeland 310 Riley St | Zeeland | MI | Transportation Equipment Manufacturing336390 | 20-99 | ◐ LIKELY ACTIVE |
| UMUS MI Zeeland 380 Riley St | Zeeland | MI | Transportation Equipment Manufacturing336390 | 20-99 | ◐ LIKELY ACTIVE |
| UMUS MI Zeeland 58 Riley St | Zeeland | MI | Transportation Equipment Manufacturing336390 | 500+ | ◐ LIKELY ACTIVE |
| UMUS MI Zeeland 790 Case Karsten | Zeeland | MI | Transportation Equipment Manufacturing336390 | 20-99 | ◐ LIKELY ACTIVE |
| UMUS MI Zeeland 9001 Riley NRC, Building 10 | Zeeland | MI | Transportation Equipment Manufacturing336390 | 100-499 | ◐ LIKELY ACTIVE |
| VNValeo North America Inc. - Front End Module | Highland Park | MI | Transportation Equipment Manufacturing336320 | 100-499 | ◐ LIKELY ACTIVE |
| VTValley Truck Parts | Grand Rapids | MI | Transportation Equipment Manufacturing336350 | 100-499 | ◐ LIKELY ACTIVE |