| TEThermal Engineering International | Sapulpa | OK | — | ◇ UNVERIFIED |
| TQThieman Quality Metal Fabrication, INC. | New Bremen | OH | — | ◇ UNVERIFIED |
| TWThompsons Welding and Machine Works | Philadelphia | MS | — | ◇ UNVERIFIED |
| TRThree Rivers Crane, INC. | Oakdale | PA | — | ◇ UNVERIFIED |
| TRTier Rack Corporation, Como Plant | Como | MS | — | ◇ UNVERIFIED |
| TITifa Intl LLC | Millington | NJ | — | ◇ UNVERIFIED |
| TSTipton Structural Fabrication INC | Tipton | IA | — | ◇ UNVERIFIED |
| TFTitan Fabrication | Owensboro | KY | — | ◇ UNVERIFIED |
| TSTitan Steel CORP | Kirkville | NY | — | ◇ UNVERIFIED |
| TFTopeka Foundry and Ironworks CO | Topeka | KS | — | ◇ UNVERIFIED |
| TITorwel Industries | Worcester | MA | — | ◇ UNVERIFIED |
| TSTower Support Services LLC | Mckenzie | TN | — | ◇ UNVERIFIED |
| TTTower Tech | Abilene | TX | — | ◇ UNVERIFIED |
| TFTradeline Fabricating | Lawrenceburg | IN | — | ◇ UNVERIFIED |
| TITramco INC. | Wichita | KS | — | ◇ UNVERIFIED |
| TMTramont Manufacturing LLC | Milwaukee | WI | — | ◇ UNVERIFIED |
| TTranter | Houston | TX | — | ◇ UNVERIFIED |
| TTrcm | Maysville | KY | — | ◇ UNVERIFIED |
| TETrend Electronics INC | Gallatin | TN | — | ◇ UNVERIFIED |
| TCTrinity Containers LLC / Plt 27 | Tulsa | OK | — | ◇ UNVERIFIED |
| TITrinity Inds INC Plant 04 | Rocky Mount | NC | — | ◇ UNVERIFIED |
| TITrinity Industries | Elizabethtown | KY | — | ◇ UNVERIFIED |
| TITrinity Industries INC Plt 23 | Denton | TX | — | ◇ UNVERIFIED |
| TITrinity Industries Plant 127 Stearns Airport Equip | Fort Worth | TX | — | ◇ UNVERIFIED |
| TITrinity Industries Plant 17 | Longview | TX | — | ◇ UNVERIFIED |
| TRTrinity Railcar Plant 192 | Saginaw | TX | — | ◇ UNVERIFIED |
| TTTrinity Tank Car INC Plt 110 | Longview | TX | — | ◇ UNVERIFIED |
| TTTrinity Tank Car INC Plt 194 | Longview | TX | — | ◇ UNVERIFIED |
| TSTriple S CORP | Beckley | WV | — | ◇ UNVERIFIED |
| TITri-state Ironworks INC | Memphis | TN | — | ◇ UNVERIFIED |
| TTrostel | Mcallen | TX | — | ◇ UNVERIFIED |
| TIT&w Industries Services | Folkston | GA | — | ◇ UNVERIFIED |
| UMUmi Metalfab | Menomonee Falls | WI | — | ◇ UNVERIFIED |
| USUnico Steel, INC. | City of Industry | CA | — | ◇ UNVERIFIED |
| UIUnimast Incorporated | Boonton | NJ | — | ◇ UNVERIFIED |
| UMUnion Metal - Canton | Canton | OH | — | ◇ UNVERIFIED |
| UTUnion Tag Manufacturing | Raiford | FL | — | ◇ UNVERIFIED |
| USUnited Steel Works, INC. | Clearwater | FL | — | ◇ UNVERIFIED |
| UFUniversal Fabricating & Construction Ser | Columbus | OH | — | ◇ UNVERIFIED |
| UUnknown | Topeka | KS | — | ◇ UNVERIFIED |
| UIUpper Iowa University - Peacock Arts & Athletics Center | Fayette | IA | — | ◇ UNVERIFIED |
| UDUrgent Design and Mfg INC | Lapeer | MI | — | ◇ UNVERIFIED |
| ULUscoe Louisville Repair Sta | Louisville | KY | — | ◇ UNVERIFIED |
| UDU.s. Defense National Stockpile Center Point Pleasant Depot | Point Pleasant | WV | — | ◇ UNVERIFIED |
| UMUS Machine INC | Fairmont | WV | — | ◇ UNVERIFIED |
| USUsp Structural Connectors | Montgomery | MN | — | ◇ UNVERIFIED |
| UOUtility Optimization Group LLC | Pascagoula | MS | — | ◇ UNVERIFIED |
| VWValley West Welding CO INC | Waverly | TN | — | ◇ UNVERIFIED |
| VIValmont Industries INC | Tulsa | OK | — | ◇ UNVERIFIED |
| VNValmont Newmark | Hazleton | PA | — | ◇ UNVERIFIED |
| VFValmont-newmark Fab Shop | Tuscaloosa | AL | — | ◇ UNVERIFIED |
| VValmont/texas | Brenham | TX | — | ◇ UNVERIFIED |
| VSVandellen Steel INC | Dutton | MI | — | ◇ UNVERIFIED |
| VFVan Fab INC | Union Hill | IL | — | ◇ UNVERIFIED |
 Van Linda Iron Works INC | Lake Worth | FL | — | ◇ UNVERIFIED |
| VMVaughn Manufacturing Corporation | Salisbury | MA | — | ◇ UNVERIFIED |
| VIVega Iron Works | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| VWVenture Welding (howe) | Howe | IN | — | ◇ UNVERIFIED |
| VEVernon E Faulconer INC - Ambrose #1 | Ruston | LA | — | ◇ UNVERIFIED |
| VMVi Manufacturing INC | Webster | NY | — | ◇ UNVERIFIED |
| VCVirginia Carolina Steel Incorporated | Norfolk | VA | — | ◇ UNVERIFIED |
| VSVista Steel | Ventura | CA | — | ◇ UNVERIFIED |
| VSVoight & Schweitzer | Muskogee | OK | — | ◇ UNVERIFIED |
| VLVstructural LLC | Fort Worth | TX | — | ◇ UNVERIFIED |
| WWWagnerplate Works West | Paramount | CA | — | ◇ UNVERIFIED |
| WFWalco Fabricating INC | Pottsville | PA | — | ◇ UNVERIFIED |
| WMWalker Metal Works LLC | Abingdon | VA | — | ◇ UNVERIFIED |
| WSWalker Station Equipment Company LLC | Tavares | FL | — | ◇ UNVERIFIED |
| WTWard Tank | Charlotte | NC | — | ◇ UNVERIFIED |
| WFWarren Fabricating & Machining CORP | Hubbard | OH | — | ◇ UNVERIFIED |
| WMWaste Management of Ohio | Cleveland | OH | — | ◇ UNVERIFIED |
| WLWastequip Lm Industries Greer Plant | Greer | SC | — | ◇ UNVERIFIED |
| WMWastequip Manufacturing | Beeville | TX | — | ◇ UNVERIFIED |
 Wastequip Manufacturing CO LLC | East Saint Louis | IL | — | ◇ UNVERIFIED |
| WMWastequip Manufacturing Company, Dba May Fab | Brookhaven | MS | — | ◇ UNVERIFIED |
| WMWastequip Manufacturing Company LLC Dba Galbreath LLC Plant #2 East | Winamac | IN | — | ◇ UNVERIFIED |
| WBWatson Bowman Acme CORP | Buffalo | NY | — | ◇ UNVERIFIED |
| WCWear Concepts LLC | Liberty | MO | — | ◇ UNVERIFIED |
| WMWebco Mfg. | Olathe | KS | — | ◇ UNVERIFIED |
| WMWendland Manufacturing | San Angelo | TX | — | ◇ UNVERIFIED |
| WCWerner Company Louisville | Louisville | KY | — | ◇ UNVERIFIED |
| WCWest Coast Metal Finishing | Los Angeles | CA | — | ◇ UNVERIFIED |
| WIWesterman, INC. | Skiatook | OK | — | ◇ UNVERIFIED |
| WFWest Facility - South Bearhead Creek Field | Fields | LA | — | ◇ UNVERIFIED |
| WVWest Virginia Steel CORP | Charleston | WV | — | ◇ UNVERIFIED |
| WEWheelabrator Energy Systems | Sturbridge | MA | — | ◇ UNVERIFIED |
| WCWheeling Corrugating CO | Gary | IN | — | ◇ UNVERIFIED |
| WCWhiskey Creek Farms | Lawton | IA | — | ◇ UNVERIFIED |
| WFWhite Fab INC | Birmingham | AL | — | ◇ UNVERIFIED |
| WWWildeck West Dba Ladder Industries | Goodyear | AZ | — | ◇ UNVERIFIED |
| WMWillerding Metal Fabrication INC | O Fallon | MO | — | ◇ UNVERIFIED |
| WBWilliams Bridge Company | Bessemer | AL | — | ◇ UNVERIFIED |
| WMWilliams Machine Works INC | Moss Point | MS | — | ◇ UNVERIFIED |
| WMWilliams Machine Works Inc, Facility Number 2 | Pascagoula | MS | — | ◇ UNVERIFIED |
| WFWilliamstown Fabricators INC | Parkersburg | WV | — | ◇ UNVERIFIED |
| WWWilsonart - Wichita Kansas | Wichita | KS | — | ◇ UNVERIFIED |
| WEWilson Equipment Repair INC | Morgantown | WV | — | ◇ UNVERIFIED |
| WSWindsor Steel , INC | Elkhart | IN | — | ◇ UNVERIFIED |
| WIWirecrafters, INC. | Louisville | KY | — | ◇ UNVERIFIED |
| WFWitherup Fabricating & Erection | Oil City | PA | — | ◇ UNVERIFIED |
