| SVShiloh Valley City | Valley City | OH | Transportation Equipment Manufacturing336370 | 20-99 | ◐ LIKELY ACTIVE |
| SSidney | Sidney | OH | Transportation Equipment Manufacturing336370 | 100-499 | ◐ LIKELY ACTIVE |
SkyMark Refuelers, LLC | Findlay | OH | Transportation Equipment Manufacturing336211 | 20-99 | ◐ LIKELY ACTIVE |
| S1Source 1 Alloys, INC. | Cincinnati | OH | Transportation Equipment Manufacturing336412 | — | ◐ LIKELY ACTIVE |
| SASpringfield Assembly Plant | Springfield | OH | Transportation Equipment Manufacturing336112 | 500+ | ◐ LIKELY ACTIVE |
| SEStanley Electric US Co Inc - ELP | London | OH | Transportation Equipment Manufacturing336320 | 100-499 | ◐ LIKELY ACTIVE |
| SHSTE Hackney Inc - Kidron, OH | Kidron | OH | Transportation Equipment Manufacturing336212 | 100-499 | ◐ LIKELY ACTIVE |
| SAStellar Automotive Group | Seville | OH | Transportation Equipment Manufacturing336390 | 20-99 | ◐ LIKELY ACTIVE |
| STSutphen Towers, Inc. | Hilliard | OH | Transportation Equipment Manufacturing336211 | 100-499 | ◐ LIKELY ACTIVE |
| SUSutphen Urbana | Urbana | OH | Transportation Equipment Manufacturing336120 | 100-499 | ◐ LIKELY ACTIVE |
| TCTelamon Corporation - Dayton | Dayton | OH | Transportation Equipment Manufacturing336320 | 20-99 | ◐ LIKELY ACTIVE |
| TGThe Great Lakes Towing Company | Cleveland | OH | Transportation Equipment Manufacturing336611 | 100-499 | ◐ LIKELY ACTIVE |
| TRTHK Rhythm North America (Ohio) | Hebron | OH | Transportation Equipment Manufacturing336330 | 100-499 | ◐ LIKELY ACTIVE |
| TPTMG Performance Products | Berea | OH | Transportation Equipment Manufacturing336390 | 20-99 | ◐ LIKELY ACTIVE |
| TMToledo Molding & Die Tiffin Plant | Tiffin | OH | Transportation Equipment Manufacturing336390 | 100-499 | ◐ LIKELY ACTIVE |
| TTToledo Tool and Die Bennett | Toledo | OH | Transportation Equipment Manufacturing336370 | 100-499 | ◐ LIKELY ACTIVE |
| TTToledo Tool and Die Pioneer | Pioneer | OH | Transportation Equipment Manufacturing336370 | 100-499 | ◐ LIKELY ACTIVE |
| TTToledo Transmission Operations | Toledo | OH | Transportation Equipment Manufacturing336350 | 500+ | ◐ LIKELY ACTIVE |
| TITrailstar International Inc. | Alliance | OH | Transportation Equipment Manufacturing336212 | 20-99 | ◐ LIKELY ACTIVE |
| TITransdigm INC | Cleveland | OH | Transportation Equipment Manufacturing336413 | — | ◐ LIKELY ACTIVE |
| TITransglobal Inc | Upper Sandusky | OH | Transportation Equipment Manufacturing336212 | 100-499 | ◐ LIKELY ACTIVE |
| TMTransmission Manufacturing Plant - Ohio | Russells Point | OH | Transportation Equipment Manufacturing336350 | 500+ | ◐ LIKELY ACTIVE |
| TITrenton IC | Trenton | OH | Transportation Equipment Manufacturing336212 | 100-499 | ◐ LIKELY ACTIVE |
| TTrimline | Lagrange | OH | Transportation Equipment Manufacturing336370 | 20-99 | ◐ LIKELY ACTIVE |
| TCTsh Construction & Contracting, INC. | Cincinnati | OH | Transportation Equipment Manufacturing336413 | — | ◐ LIKELY ACTIVE |
| TTTS Tech Americas - SPPP | Athens | OH | Transportation Equipment Manufacturing336360 | 20-99 | ◐ LIKELY ACTIVE |
| TTTS Tech USA | Reynoldsburg | OH | Transportation Equipment Manufacturing336360 | 500+ | ◐ LIKELY ACTIVE |
| UTUC Trailer Co | Sunbury | OH | Transportation Equipment Manufacturing336212 | 20-99 | ◐ LIKELY ACTIVE |
| UMUGN Monroe | Monroe | OH | Transportation Equipment Manufacturing336360 | 100-499 | ◐ LIKELY ACTIVE |
| UDUnison Dayton OH Systems | Dayton | OH | Transportation Equipment Manufacturing336412 | 100-499 | ◐ LIKELY ACTIVE |
| VSVentra Sandusky, LLC | Sandusky | OH | Transportation Equipment Manufacturing336320 | 500+ | ◐ LIKELY ACTIVE |
| VAVolynt Aero, INC. | Oxford | OH | Transportation Equipment Manufacturing336411 | — | ▲ REPORTED CLOSED |
| WUWabtec - US Rail, Cleveland Service Center | Cleveland | OH | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| WOWalbridge, OH | Walbridge | OH | Transportation Equipment Manufacturing336510 | 1-19 | ◐ LIKELY ACTIVE |
| WAWeber Aerospace, LLC | Willoughby | OH | Transportation Equipment Manufacturing336413 | — | ▲ REPORTED CLOSED |
| WJWest Jefferson | West Jefferson | OH | Transportation Equipment Manufacturing336212 | 20-99 | ◐ LIKELY ACTIVE |
| WCWoodbridge Corporation - Fremont | Fremont | OH | Transportation Equipment Manufacturing336360 | 100-499 | ◐ LIKELY ACTIVE |
| ACAvio Capital Limited | Broadview Heights | OH | Transportation Equipment Manufacturing336412 | — | ◐ LIKELY ACTIVE |
| CCCarters Cargo LLC | Cincinnati | OH | Transportation Equipment Manufacturing336999 | — | ◐ LIKELY ACTIVE |
| SSSelecttech Services Corporation | Dayton | OH | Transportation Equipment Manufacturing336413 | — | ◐ LIKELY ACTIVE |
| SMSystematic Machine CORP | North Royalton | OH | Transportation Equipment Manufacturing336413 | — | ◐ LIKELY ACTIVE |
| BMBores Mfg CO INC | Monroeville | OH | Transportation Equipment Manufacturing336999 | 1-19 | ◇ UNVERIFIED |
| CPCallies Performance Products, INC. | Fostoria | OH | Transportation Equipment Manufacturing336399 | 100-499 | ◇ UNVERIFIED |
| CTConversion Technologies International, Inc. | West Unity | OH | Transportation Equipment Manufacturing336390 | 20-99 | ◇ UNVERIFIED |
| DWDuck Water Boats, INC. | New Philadelphia | OH | Transportation Equipment Manufacturing336612 | 1-19 | ◇ UNVERIFIED |
| EMEngine Machine Service INC | Canfield | OH | Transportation Equipment Manufacturing336312 | 1-19 | ◇ UNVERIFIED |
| EFExotic Fabrications LLC | Wooster | OH | Transportation Equipment Manufacturing336212 | 1-19 | ◇ UNVERIFIED |
| GAGallagher Aviation LLC | Cincinnati | OH | Transportation Equipment Manufacturing336413 | 1-19 | ◇ UNVERIFIED |
| GBGas Box, LLC | Cleveland | OH | Transportation Equipment Manufacturing336991 | 1-19 | ◇ UNVERIFIED |
| GCGear Company of America INC. | Cleveland | OH | Transportation Equipment Manufacturing336350 | 20-99 | ◇ UNVERIFIED |