| 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 |
