| TGTechnetics Group Deland | Deland | FL | Transportation Equipment Manufacturing336413 | 20-99 | ◐ LIKELY ACTIVE |
| TTect | Euclid | OH | Transportation Equipment Manufacturing336412 | — | ◐ LIKELY ACTIVE |
| TATenneco Automotive Walker | Smithville | TN | Transportation Equipment Manufacturing336390 | — | ◐ LIKELY ACTIVE |
| TITenneco INC | Marshall | MI | Transportation Equipment Manufacturing336111 | 500+ | ◐ LIKELY ACTIVE |
Terra Drive Systems, INC. | Brookston | IN | Machinery Manufacturing333111 | — | ◐ LIKELY ACTIVE |
| TATextron Aviation - Pawnee Campus | Wichita | KS | Transportation Equipment Manufacturing336411 | — | ◐ LIKELY ACTIVE |
| TGThe Gill Corporation - Maryland | Edgewood | MD | Primary Metal Manufacturing331316 | — | ◐ LIKELY ACTIVE |
| TSThermal Solutions Manufacturing INC | Dallas | TX | Transportation Equipment Manufacturing336390 | — | ◐ LIKELY ACTIVE |
| TBThomas Built Buses INC - High Point | High Point | NC | Transportation Equipment Manufacturing336211 | — | ◐ LIKELY ACTIVE |
Thomas Global Systems LLC | Irvine | CA | Chemical Manufacturing325520 | — | ◐ LIKELY ACTIVE |
| TDTiffin Door Company | Vina | AL | Wood Product Manufacturing321910 | 20-99 | ◐ LIKELY ACTIVE |
| TITomasco Indiana, LLC | Winchester | IN | Transportation Equipment Manufacturing336211 | — | ◐ LIKELY ACTIVE |
| TATower Automotive Prods CO INC | Bluffton | OH | Transportation Equipment Manufacturing336370 | 100-499 | ◐ LIKELY ACTIVE |
| TBToyota Boshoku Indiana LLC | Princeton | IN | Transportation Equipment Manufacturing336360 | 500+ | ◐ LIKELY ACTIVE |
| TBToyota Boshoku Kentucky LLC - Bardstown | Bardstown | KY | Transportation Equipment Manufacturing336360 | — | ◐ LIKELY ACTIVE |
| TTToyotetsu Texas | San Antonio | TX | Transportation Equipment Manufacturing336211 | 500+ | ◐ LIKELY ACTIVE |
| TMTracker Marine LLC | Lebanon | MO | Transportation Equipment Manufacturing336612 | 20-99 | ◐ LIKELY ACTIVE |
| TMTracker Miami Plant | Miami | OK | Transportation Equipment Manufacturing336612 | — | ◐ LIKELY ACTIVE |
| TCTranscraft Corporation | Cadiz | KY | Transportation Equipment Manufacturing336212 | — | ◐ LIKELY ACTIVE |
| TATransform Automotive - Sterling Heights | Sterling Heights | MI | Fabricated Metal Product Manufacturing332721 | 20-99 | ◐ LIKELY ACTIVE |
| TBTravis Body and Trailer | Houston | TX | Transportation Equipment Manufacturing336212 | 100-499 | ◐ LIKELY ACTIVE |
| TUTremcar USA INC | Strasburg | OH | Transportation Equipment Manufacturing336211 | 20-99 | ◐ LIKELY ACTIVE |
| TMTrinity Marine Products INC. Plt 75 | Caruthersville | MO | Transportation Equipment Manufacturing336611 | — | ◐ LIKELY ACTIVE |
| TCTriple Crown Trailers | Ocala | FL | Transportation Equipment Manufacturing336212 | 20-99 | ◐ LIKELY ACTIVE |
| TATriumph Actuation Systems | Windsor | CT | Machinery Manufacturing333995 | 100-499 | ◐ LIKELY ACTIVE |
| TCTruck Cab Manufacturers INC | Cincinnati | OH | Transportation Equipment Manufacturing336211 | 20-99 | ◐ LIKELY ACTIVE |
| TUTsuda USA Corporation | Greenfield | IN | Transportation Equipment Manufacturing336312 | 100-499 | ◐ LIKELY ACTIVE |
Turbo Systems US INC | Somerset | NJ | Transportation Equipment Manufacturing336611 | — | ◐ LIKELY ACTIVE |
| UCUmbra Cuscinetti INC | Everett | WA | Nonmetallic Mineral Product Manufacturing327331 | 20-99 | ◐ LIKELY ACTIVE |
| UTUnified Turbines LLC | Milton | VT | Transportation Equipment Manufacturing336412 | 1-19 | ◐ LIKELY ACTIVE |
| UUUnipres USA INC | Portland | TN | Transportation Equipment Manufacturing336111 | 100-499 | ◐ LIKELY ACTIVE |
| UEUnison Engine Components | Manchester | CT | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| UEUnison Engine Components Mountaintop | Mountain Top | PA | Transportation Equipment Manufacturing336412 | — | ◐ LIKELY ACTIVE |
| ULUnited Launch Alliance - Decatur Operations | Decatur | AL | Transportation Equipment Manufacturing336414 | — | ◐ LIKELY ACTIVE |
| UTUnited Techs CORP Pratt & Whitney Div | Columbus | GA | Transportation Equipment Manufacturing336412 | — | ◐ LIKELY ACTIVE |
| USUniversity Swaging Corporation | Woodinville | WA | Transportation Equipment Manufacturing336413 | 100-499 | ◐ LIKELY ACTIVE |
| UAUS Af Fairchild Airway Heights | Fairchild Afb | WA | Transportation Equipment Manufacturing336992 | — | ◐ LIKELY ACTIVE |
| UPUsaf Plant 42 Site 4 | Palmdale | CA | Transportation Equipment Manufacturing336411 | — | ◐ LIKELY ACTIVE |
| UAUS Army Anniston Army Depot | Anniston | AL | Fabricated Metal Product Manufacturing332813 | — | ◐ LIKELY ACTIVE |
| UAUS Army Red River Army Depot | Texarkana | TX | Transportation Equipment Manufacturing336992 | — | ◐ LIKELY ACTIVE |
| UAUS Army - Redstone Arsenal Garrison | Huntsville | AL | Transportation Equipment Manufacturing336413 | — | ◐ LIKELY ACTIVE |
| UEUS Engine Valve | Westminster | SC | Fabricated Metal Product Manufacturing332117 | 100-499 | ◐ LIKELY ACTIVE |
| UNU.s. Naval Submarine Base New London (subasenlon) | Groton | CT | Transportation Equipment Manufacturing336611 | — | ◐ LIKELY ACTIVE |
| UNUS Navy Fleet Combat Training Center Atl Dam Neck Range | Virginia Beach | VA | Transportation Equipment Manufacturing336612 | — | ◐ LIKELY ACTIVE |
| UNUS Navy Joint Expeditionary Base Little Creek | Norfolk | VA | Transportation Equipment Manufacturing336612 | — | ◐ LIKELY ACTIVE |
| UNUS Navy Kings Bay | Kings Bay | GA | Transportation Equipment Manufacturing336611 | — | ◐ LIKELY ACTIVE |
| UNUS Navy Naval Air Station North Island | Coronado | CA | Transportation Equipment Manufacturing336611 | — | ◐ LIKELY ACTIVE |
| UNU.s. Navy Naval Station Newport | Newport | RI | Transportation Equipment Manufacturing336611 | — | ◐ LIKELY ACTIVE |
| UNUS Navy Puget Sound Naval Shipyard (psns) - Tanks | Bremerton | WA | Transportation Equipment Manufacturing336611 | — | ◐ LIKELY ACTIVE |
| UMUsn Mayport Naval Station | Jacksonville | FL | Transportation Equipment Manufacturing336611 | — | ◐ LIKELY ACTIVE |