| TCTrinity Construction Products | Apopka | FL | — | ◇ UNVERIFIED |
| TCTrinity Containers LLC / Plt 27 | Tulsa | OK | — | ◇ UNVERIFIED |
| TFTrinity Fabricators, INC. | Saint Petersburg | FL | — | ◇ UNVERIFIED |
| TITrinity Inds INC Plant 04 | Rocky Mount | NC | — | ◇ UNVERIFIED |
| TITrinity Inds INC Plant 22 | Fort Worth | TX | — | ◇ UNVERIFIED |
| TITrinity Industries | Elizabethtown | KY | — | ◇ UNVERIFIED |
| TITrinity Industries INC Plt 23 | Denton | TX | — | ◇ UNVERIFIED |
| TITrinity Iron Works | Weaverville | CA | — | ◇ UNVERIFIED |
| TRTrinity Railcar Plant 192 | Saginaw | TX | — | ◇ UNVERIFIED |
| TSTrinity Steel Corporation | Ventura | CA | — | ◇ UNVERIFIED |
| TSTrinity Steel Fabricators, INC. | Trinity | TX | — | ◇ UNVERIFIED |
| TTTrinity Tank Car INC Plt 194 | Longview | TX | — | ◇ UNVERIFIED |
| TTTrio Tube INC | Warren | MI | — | ◇ UNVERIFIED |
| TMTriple M Steel LLC | Madison Heights | MI | — | ◇ UNVERIFIED |
| TSTriple S Dynamics INC | Cibolo | TX | — | ◇ UNVERIFIED |
| TSTriple Steel LLC | La Vergne | TN | — | ◇ UNVERIFIED |
| TTTriple T Holdings, LLC | Bellingham | WA | — | ◇ UNVERIFIED |
| TRTri Red, LLC | Rush Springs | OK | — | ◇ UNVERIFIED |
| TSTri State Cold Formed Steel Components LLC | Shepherdsville | KY | — | ◇ UNVERIFIED |
| TCTri-state Corp., LLC | Granite Quarry | NC | — | ◇ UNVERIFIED |
| TCTri-state Corp., LLC | Salisbury | NC | — | ◇ UNVERIFIED |
| TFTri-state Fabrication & Machining, LLC | Newark | DE | — | ◇ UNVERIFIED |
| TSTri State Iron Works INC | Memphis | TN | — | ◇ UNVERIFIED |
| TITri-state Ironworks INC | Memphis | TN | — | ◇ UNVERIFIED |
| TMTri-state Machine | Wheeling | WV | — | ◇ UNVERIFIED |
| TCTri-steel Corporation | Bakersfield | CA | — | ◇ UNVERIFIED |
| TFTri-steel Fabricators, INC. | Sims | NC | — | ◇ UNVERIFIED |
| TTri-tech | Austell | GA | — | ◇ UNVERIFIED |
| TSTriview Steel & Supply INC. | Sioux City | IA | — | ◇ UNVERIFIED |
| TMTri-way Metalworkers, INC. | Shenandoah | PA | — | ◇ UNVERIFIED |
| TRTri-way Rebar INC. | Ravenna | OH | — | ◇ UNVERIFIED |
| TITRMM Industries | Milford | DE | — | ◇ UNVERIFIED |
| TTrostel | Mcallen | TX | — | ◇ UNVERIFIED |
| TITrovo INC | Portland | OR | — | ◇ UNVERIFIED |
| TLTrue Line Steel INC | Redmond | OR | — | ◇ UNVERIFIED |
| TMTruemark Metals, LLC | Alabaster | AL | — | ◇ UNVERIFIED |
 Truenorth Steel - Huron | Huron | SD | — | ◇ UNVERIFIED |
| Truenorth Steel, INC. | Missoula | MT | — | ◇ UNVERIFIED |
 Tru Flow Systems INC. | Lake Point | UT | — | ◇ UNVERIFIED |
| TITsgc, INC. | Corpus Christi | TX | — | ◇ UNVERIFIED |
| TMTSG Management, LLC | Wyandotte | MI | — | ◇ UNVERIFIED |
| TMTsi/architectural Metals, INC. | Upper Marlboro | MD | — | ◇ UNVERIFIED |
| TTT&s Tubular Solutions | Hale | MI | — | ◇ UNVERIFIED |
| TIT&t Industrial Spray Coating | Lowell | MA | — | ◇ UNVERIFIED |
| TTT&t Towers, INC. | Kahului | HI | — | ◇ UNVERIFIED |
| TFTubular Fabricating Company INC | Birmingham | AL | — | ◇ UNVERIFIED |
| TITunl Industries, INC | Irvine | CA | — | ◇ UNVERIFIED |
| TSTurf Star-hayward | Rancho Cordova | CA | — | ◇ UNVERIFIED |
| TMTurnbull Metal Products | Gulfport | MS | — | ◇ UNVERIFIED |
| TETurner Equipment Company, INC. | Goldsboro | NC | — | ◇ UNVERIFIED |
| TITurner Industries Group LLC - Pipe Fabrication Division | New Iberia | LA | — | ◇ UNVERIFIED |
| TMTurner Mfg. CO. INC. | Fresno | CA | — | ◇ UNVERIFIED |
| TOT&v Optimum, LLC | Lockhart | TX | — | ◇ UNVERIFIED |
| TITwenty-Two, Inc. | Mundelein | IL | — | ◇ UNVERIFIED |
| TSTwisted Steel | Hurricane | UT | — | ◇ UNVERIFIED |
| TTTw Tanks & Const. Co., INC. | Beeville | TX | — | ◇ UNVERIFIED |
| TMTyson Metal Works | Opelika | AL | — | ◇ UNVERIFIED |
| UIUis INC | Lindon | UT | — | ◇ UNVERIFIED |
| USUltimate Steel & Fabrication LLC | Mechanicsville | MD | — | ◇ UNVERIFIED |
| UWUltimate Workmanship LLC | Cedar City | UT | — | ◇ UNVERIFIED |
| UMUmi Metalfab | Menomonee Falls | WI | — | ◇ UNVERIFIED |
| UUUncommon USA INC | Willmar | MN | — | ◇ UNVERIFIED |
| USUnico Steel, INC. | City of Industry | CA | — | ◇ UNVERIFIED |
| UMUnified Manufacturing INC | Valencia | CA | — | ◇ UNVERIFIED |
| UTUniform Tubes INC | South Plainfield | NJ | — | ◇ UNVERIFIED |
| UMUnion Metal - Canton | Canton | OH | — | ◇ UNVERIFIED |
| UMUnion Metal Industries CORP | Canton | OH | — | ◇ UNVERIFIED |
| UMUnique Metal Products LLC | Eugene | OR | — | ◇ UNVERIFIED |
| ULUnited Lighting Standards, INC. | Warren | MI | — | ◇ UNVERIFIED |
| UMUnited Metalcraft, INC. | Marietta | GA | — | ◇ UNVERIFIED |
| UMUnited Millwright LLC | Mt Zion | IL | — | ◇ UNVERIFIED |
| UMUnited Millwright LLC | Mt Zion | IL | — | ◇ UNVERIFIED |
| UMUnited Misc & Ornamental Steel INC Dba Umo Steel INC | Union City | CA | — | ◇ UNVERIFIED |
| UMUnited Misc. & Ornamental Steel, Inc. | Union City | CA | — | ◇ UNVERIFIED |
| UPUnited Panel Corporation | Griffin | GA | — | ◇ UNVERIFIED |
| UPUnited Panel Corporation | Cartersville | GA | — | ◇ UNVERIFIED |
| UPUnited Partition Systems Inc | Ontario | CA | — | ◇ UNVERIFIED |
| UPUnited Pipe Bending & Fabrication INC | Portland | OR | — | ◇ UNVERIFIED |
| USUnited Spring Technology INC | Farmington Hills | MI | — | ◇ UNVERIFIED |
| USUnited Steel Fabricators INC | Rialto | CA | — | ◇ UNVERIFIED |
| USUnited Steel, INC. | Wichita | KS | — | ◇ UNVERIFIED |
| USUnited Steel Products | Largo | FL | — | ◇ UNVERIFIED |
| USUnited Steel Products Company, INC. | Livermore | CA | — | ◇ UNVERIFIED |
| USUnited Steel Works, INC. | Clearwater | FL | — | ◇ UNVERIFIED |
| USUnited Steel Works, INC. | Clearwater | FL | — | ◇ UNVERIFIED |
| USUnited Structural Works, INC. | Congers | NY | — | ◇ UNVERIFIED |
| USUnited Structures of Georgia LLC | Cairo | GA | — | ◇ UNVERIFIED |
 Universal Compressor Solutions LLC | Mayfield | KY | — | ◇ UNVERIFIED |
| UEUniversal Enterprises, INC. | Shinnston | WV | — | ◇ UNVERIFIED |
| UFUniversal Fabricating & Construction Ser | Columbus | OH | — | ◇ UNVERIFIED |
| UFUniversal Fabricators, LLC | Eglin Afb | FL | — | ◇ UNVERIFIED |
| UHUniversal Head CO INC | Joliet | IL | — | ◇ UNVERIFIED |
| UIUniversal Iron Works, INC | Pacoima | CA | — | ◇ UNVERIFIED |
| UMUniversal Metal Hose Company | Chicago | IL | — | ◇ UNVERIFIED |
| UOUniversal Ornamental Iron, INC. | Conyers | GA | — | ◇ UNVERIFIED |
| URUniversal Roll Forming INC | Lindon | UT | — | ◇ UNVERIFIED |
| USUniversal Steel Fabricators, INC. | Brooklyn | NY | — | ◇ UNVERIFIED |
| USUniversal Steel of North Carolina, LLC | Thomasville | NC | — | ◇ UNVERIFIED |
| UTUniversal Tool Steel LLC | Springfield | TN | — | ◇ UNVERIFIED |
| UUnknown | Topeka | KS | — | ◇ UNVERIFIED |
