| SCSoutheast Culvert, INC. | Cleveland | AL | — | ◇ UNVERIFIED |
| SISouthern Industrial Mechanical Maintenance Company Ii, LLC | Brownsville | TN | — | ◇ UNVERIFIED |
| SISouthern Industrial Mechanical Maintenance Company, LLC | Shreveport | LA | — | ◇ UNVERIFIED |
| SNSouthern Natural Gas - Mdc | Pinson | AL | — | ◇ UNVERIFIED |
| STSouthern Thermal Solutions, INC. | Sanford | NC | — | ◇ UNVERIFIED |
| STSouthern Tube Form | Clinton | TN | — | ◇ UNVERIFIED |
| SPSouthland Pipe CORP. | Rialto | CA | — | ◇ UNVERIFIED |
| SPSouthland Pipe Corporation | Hesperia | CA | — | ◇ UNVERIFIED |
| SASpecialty Aluminum Incorporated | Revere | MA | — | ◇ UNVERIFIED |
| SBSpindler Brothers | Kenilworth | NJ | — | ◇ UNVERIFIED |
| SFSpintek Foundry and Machine, LLC | Mound House | NV | — | ◇ UNVERIFIED |
| SBSpray Booth | Temple | TX | — | ◇ UNVERIFIED |
| SCSps Companies INC Dba Pipe Fabricators | Osseo | MN | — | ◇ UNVERIFIED |
| SSS & S Tube INC | Bay Port | MI | — | ◇ UNVERIFIED |
| SIStaffmark Investment LLC | Heber Springs | AR | — | ◇ UNVERIFIED |
| SSStahl Speciality CO North | Kingsville | MO | — | ◇ UNVERIFIED |
| SUStant USA CORP | Romeo | MI | — | ◇ UNVERIFIED |
| SCSt Clair Die Casting Llc-st Clair Die Casting LLC | Saint Clair | MO | — | ◇ UNVERIFIED |
| SPSteel Pipe Fabricators, LLC | Norcross | GA | — | ◇ UNVERIFIED |
| SISteico Industries INC a Subsidiary at Senior Operation LLC | Oceanside | CA | — | ◇ UNVERIFIED |
 Stephens Pipe & Steel, LLC | Wyoming | MI | — | ◇ UNVERIFIED |
| SPSt Paul Brass and Aluminum Foundry | Saint Paul | MN | — | ◇ UNVERIFIED |
| SPStructure Personnel INC. | Seville | OH | — | ◇ UNVERIFIED |
| SMStylelander Metal Stampings INC | Verona | MS | — | ◇ UNVERIFIED |
| SMSullivan Metals INC | Holly Springs | MS | — | ◇ UNVERIFIED |
| SISulvan Industrial Piping | Perth Amboy | NJ | — | ◇ UNVERIFIED |
| SDSuperior Drillpipe Manufacturing | Houston | TX | — | ◇ UNVERIFIED |
| SISuperior Industries International INC | Van Nuys | CA | — | ◇ UNVERIFIED |
| SMSuperior Metal Fabricators, INC. | Las Vegas | NV | — | ◇ UNVERIFIED |
| STSuperior Tube Products, INC. | Davenport | IA | — | ◇ UNVERIFIED |
| SNSupply Network INC Dba Viking Supplynet & Fabrication Services | Hayward | CA | — | ◇ UNVERIFIED |
| SNSupply Network INC Dba Viking Supplynet & Fabrication Services | Santa Fe Spgs | CA | — | ◇ UNVERIFIED |
| TPTampa Pipe & Welding, INC. | Galveston | TX | — | ◇ UNVERIFIED |
| TITbc INC | Green Bay | WI | — | ◇ UNVERIFIED |
| TSTeam Staffing Solutions, INC. | Fairfield | IA | — | ◇ UNVERIFIED |
| TCTejas Casing | Houston | TX | — | ◇ UNVERIFIED |
| TTTejas Tubular Products | Houston | TX | — | ◇ UNVERIFIED |
| TCTeledyne Cast Parts Pomona Operations | Walnut | CA | — | ◇ UNVERIFIED |
| TMTelstar Metals INC. | Chetopa | KS | — | ◇ UNVERIFIED |
| TATemp Associates | Fairfield | IA | — | ◇ UNVERIFIED |
| TATemple Aluminum Foundry, Incorporated | Blandon | PA | — | ◇ UNVERIFIED |
| TFTenaris Freeport | Freeport | TX | — | ◇ UNVERIFIED |
| TATexas Arai | Houston | TX | — | ◇ UNVERIFIED |
| TSTexas Steel Conversion INC | Houston | TX | — | ◇ UNVERIFIED |
| TFThe Ford Meter Box Company, INC. (dowzer) | Pell City | AL | — | ◇ UNVERIFIED |
 Thermal Pipe Systems, INC. | Durant | OK | — | ◇ UNVERIFIED |
| TTThe Tapco Tube Company | Kansas City | MO | — | ◇ UNVERIFIED |
| TTThe Troxel Company | Moscow | TN | — | ◇ UNVERIFIED |
| TGThomas G. Gallagher, INC. | Andover | MA | — | ◇ UNVERIFIED |
| TPThomas Paulson & Son INC | Brooklyn | NY | — | ◇ UNVERIFIED |
| TSThornton Salvage | Kankakee | IL | — | ◇ UNVERIFIED |
| TAThreading and Precision Manufacturing, LLC | Houston | TX | — | ◇ UNVERIFIED |
| TATi Automotive | Cartersville | GA | — | ◇ UNVERIFIED |
| TATi Automotive Systems, LLC | Cartersville | GA | — | ◇ UNVERIFIED |
| TBTl Becker Corporation | Eugene | OR | — | ◇ UNVERIFIED |
| T4Tmb 440ae, INC. | Elgin | IL | — | ◇ UNVERIFIED |
| TITmk Ipsco | Catoosa | OK | — | ◇ UNVERIFIED |
| TCTrade Construction Company, LLC | Baton Rouge | LA | — | ◇ UNVERIFIED |
| TPTrenton Pipe Nipple Company, LLC | Federalsburg | MD | — | ◇ UNVERIFIED |
| TCTri County Tube INC | Clinton | TN | — | ◇ UNVERIFIED |
| TFTrident Fire & Fabrication, LLC | Carlstadt | NJ | — | ◇ UNVERIFIED |
| TITrinity Inds INC Fitting Grp | Russellville | AR | — | ◇ UNVERIFIED |
| TFTrio Foundry INC | Aurora | IL | — | ◇ UNVERIFIED |
| TFTrio Foundry, INC | Sandwich | IL | — | ◇ UNVERIFIED |
| TITri-State Industries of Tulsa LLC | Tulsa | OK | — | ◇ UNVERIFIED |
| TTTrojan Tube Sales and Fabrications INC. | Muncy | PA | — | ◇ UNVERIFIED |
| TRT. Rowe Pipe, LLC | Ponca City | OK | — | ◇ UNVERIFIED |
 Truenorth Steel INC | Saint Paul | MN | — | ◇ UNVERIFIED |
| TFTube Fab Roman Engineering CO INC | Afton | MI | — | ◇ UNVERIFIED |
| TFTube Forgings of America INC | Portland | OR | — | ◇ UNVERIFIED |
 Tube Processing Corporation | Southport | IN | — | ◇ UNVERIFIED |
| TPTube Products Corporation | Burnsville | MN | — | ◇ UNVERIFIED |
| TITubes, INC | Geismar | LA | — | ◇ UNVERIFIED |
| TSTube Solutions | Costa Mesa | CA | — | ◇ UNVERIFIED |
| TMTubesource Manufacturing INC | Ferndale | MI | — | ◇ UNVERIFIED |
| TSTube Specialties Co., INC. | Statesville | NC | — | ◇ UNVERIFIED |
| TCTubodyne CO | East Providence | RI | — | ◇ UNVERIFIED |
| TSTubular Solutions | Houston | TX | — | ◇ UNVERIFIED |
| TSTubular Solutions INC | Portland | OR | — | ◇ UNVERIFIED |
| TCTurbo Components INC | Spring Lake | MI | — | ◇ UNVERIFIED |
| TITurner Industries | Pasadena | TX | — | ◇ UNVERIFIED |
| TITurner Industries Group Paris Plant | Paris | TX | — | ◇ UNVERIFIED |
| TCTwin City Holland LLC - Administrative Id # Only | Davenport | IA | — | ◇ UNVERIFIED |
| TBTy Bar CORP | South Gate | CA | — | ◇ UNVERIFIED |
| UAUf Acquisitions, INC. | Johnstown | PA | — | ◇ UNVERIFIED |
| UPUlrich Process Piping, LLC | Greensboro | NC | — | ◇ UNVERIFIED |
| UCUltimate Casting and Machining | West Branch | MI | — | ◇ UNVERIFIED |
| UPUltra Premium Oilfield Services | Odessa | TX | — | ◇ UNVERIFIED |
| UWUltra Wheel CO | Buena Park | CA | — | ◇ UNVERIFIED |
| UPUnderground Products, Inc. | Houston | TX | — | ◇ UNVERIFIED |
| UCUnited Casing Tubular Services | Midland | TX | — | ◇ UNVERIFIED |
| UCUnited Casing Tubular Services Sheldon Road | Houston | TX | — | ◇ UNVERIFIED |
| USUnited Sprinkler INC | Rush City | MN | — | ◇ UNVERIFIED |
| USUnited States Pipe and Foundry Company LLC | Rogers | MN | — | ◇ UNVERIFIED |
| USUnited States Pipe and Foundry Company, LLC | — | IL | — | ◇ UNVERIFIED |
| UTUnited Tube Bending | Montclair | CA | — | ◇ UNVERIFIED |
| UDUniversal Die Casting CO | Los Angeles | CA | — | ◇ UNVERIFIED |
| UNUp North Industries LLC | Petoskey | MI | — | ◇ UNVERIFIED |
| UCUS Castings LLC | Entiat | WA | — | ◇ UNVERIFIED |
| UOUsdol Osha | Cleveland | TX | — | ◇ UNVERIFIED |
