| TPTrinity Products, INC. | Saint Charles | MO | — | ◇ UNVERIFIED |
| TPTrinity Products, LLC | O Fallon | MO | — | ◇ UNVERIFIED |
 Trinity Stainless INC. | Nixa | MO | — | ◇ UNVERIFIED |
| TSTri-state Steel of Nevada LLC | Las Vegas | NV | — | ◇ UNVERIFIED |
| TVTri Valley Iron INC. | Palisades | NY | — | ◇ UNVERIFIED |
 Truenorth Steel | Billings | MT | — | ◇ UNVERIFIED |
| TSTryad Service CORP. | Shafter | CA | — | ◇ UNVERIFIED |
| TUTubacex US Holding INC / Tubacex US Holding INC | Durant | OK | — | ◇ UNVERIFIED |
| TBTube Bending Specialists & Machinery, LLC | Hayward | CA | — | ◇ UNVERIFIED |
| TCTube City Ims LLC | Portage | IN | — | ◇ UNVERIFIED |
| TNTubetech North America, INC. | E Palestine | OH | — | ◇ UNVERIFIED |
| TSTuboscope Sheldon South Inspection Facility | Channelview | TX | — | ◇ UNVERIFIED |
| TPTubular Perforating Manufacturing of Conroe, LTD. | Conroe | TX | — | ◇ UNVERIFIED |
| TPTubular Processing Houston Operations | Houston | TX | — | ◇ UNVERIFIED |
| TPTubular Products Company, INC. | Birmingham | AL | — | ◇ UNVERIFIED |
| TSTubular Steel, INC. | Hazelwood | MO | — | ◇ UNVERIFIED |
| TSTubular Structures International, L.l.c | Mc Gregor | TX | — | ◇ UNVERIFIED |
| TPTurning Point Custom Machine LLC | De Pere | WI | — | ◇ UNVERIFIED |
| TETvek Enterprises, INC. | Mingo Junction | OH | — | ◇ UNVERIFIED |
| TMTy M. Wright | Portland | OR | — | ◇ UNVERIFIED |
| UHUltimate Highway Sales, INC. | Palos Heights | IL | — | ◇ UNVERIFIED |
| UUUltra USA INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| UEUnion Elec Steel Carnegie Plt | Carnegie | PA | — | ◇ UNVERIFIED |
| UTUnion Tube Mill LLC | Union City | IN | — | ◇ UNVERIFIED |
| UAUnited Alloys INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| UIUnited Industries | Selmer | TN | — | ◇ UNVERIFIED |
| UPUnited Pipe & Steel | Stockton | CA | — | ◇ UNVERIFIED |
| USUnited Spiral Pipe LLC Manufacturing Plan | Pittsburg | CA | — | ◇ UNVERIFIED |
| USUnited Stars INC | Beloit | WI | — | ◇ UNVERIFIED |
| USUnited States Steel Corporation | Worcester | MA | — | ◇ UNVERIFIED |
| UTUnited Tube Corparation | Medina | OH | — | ◇ UNVERIFIED |
| URUnitrac Railroad Materials INC. | Knoxville | TN | — | ◇ UNVERIFIED |
| UTUnity Tube, Inc. | East Palestine | OH | — | ◇ UNVERIFIED |
| UFUniversal Fabrication, LLC | Kenner | LA | — | ◇ UNVERIFIED |
| UMUniversal Machine Company INC | Paramount | CA | — | ◇ UNVERIFIED |
 Universal Stainless & Alloy Products INC. | North Jackson | OH | — | ◇ UNVERIFIED |
| UTUniversal Tube | Rochester Hills | MI | — | ◇ UNVERIFIED |
| UWUSA Waste (monroeville Landfill) | Monroeville | PA | — | ◇ UNVERIFIED |
| UOUsdol Osha-atlanta East | Gainesville | GA | — | ◇ UNVERIFIED |
| UDU.s. Dol-osha Corpus Christi Area Office | Mcallen | TX | — | ◇ UNVERIFIED |
| UOUsdol Osha - (mobile) | Calvert | AL | — | ◇ UNVERIFIED |
| UIU.s. Industrial Piping, INC. | Kernersville | NC | — | ◇ UNVERIFIED |
| USU. S. Pipe | Lynchburg | VA | — | ◇ UNVERIFIED |
| UPUS Pipe Fabrication, LLC | Ocala | FL | — | ◇ UNVERIFIED |
| UCUss Central Teaming Company INC | Gary | IN | — | ◇ UNVERIFIED |
| USUS Steel CORP Joliet Works | Joliet | IL | — | ◇ UNVERIFIED |
| USU.s. Steel Corporation | Fairless Hills | PA | — | ◇ UNVERIFIED |
| USUS Steel East Chicago | East Chicago | IN | — | ◇ UNVERIFIED |
| USUS Steel - Gary Works | Chicago | IL | — | ◇ UNVERIFIED |
| USUS Steel - Lorain Tubular Operations | Lorain | OH | — | ◇ UNVERIFIED |
