| SSSalina Steel Supply, Inc. | Salina | KS | Primary Metal Manufacturing331221 | 20-99 | ◐ LIKELY ACTIVE |
| SCSasol Chemicals (USA) LLC | Tucson | AZ | Primary Metal Manufacturing331313 | 20-99 | ◐ LIKELY ACTIVE |
Sawbrook Steel Casting LLC | Lockland | OH | Primary Metal Manufacturing331513 | 20-99 | ◐ LIKELY ACTIVE |
| SSawyer | Sawyer | MI | Primary Metal Manufacturing331221 | 20-99 | ◐ LIKELY ACTIVE |
| SIScepter Inc - Bicknell Operations | Bicknell | IN | Primary Metal Manufacturing331314 | 20-99 | ◐ LIKELY ACTIVE |
| SISeaCast Inc - Seattle | Marysville | WA | Primary Metal Manufacturing331512 | 20-99 | ◐ LIKELY ACTIVE |
| SASierra Aluminum - NAPA | Fontana | CA | Primary Metal Manufacturing331318 | 20-99 | ◐ LIKELY ACTIVE |
| SASierra Aluminum - Union | Fontana | CA | Primary Metal Manufacturing331318 | 20-99 | ◐ LIKELY ACTIVE |
| SESigma Engineered Solutions - IC | Markesan | WI | Primary Metal Manufacturing331512 | 20-99 | ◐ LIKELY ACTIVE |
| SASkana Aluminum West Virginia | Clarksburg | WV | Primary Metal Manufacturing331315 | 20-99 | ◐ LIKELY ACTIVE |
| SWSmith & Wesson Houlton, ME Site B | Houlton | ME | Primary Metal Manufacturing331221 | 20-99 | ◐ LIKELY ACTIVE |
| STSoutheast Tubular Products, Inc. | Statesville | NC | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| SCSouthern Casting Company | Sevierville | TN | Primary Metal Manufacturing331524 | 20-99 | ◐ LIKELY ACTIVE |
| SNSouthern New Jersey Steel Co. Inc. | Vineland | NJ | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| SSSouth Salt Lake City Branch | South Salt Lake | UT | Primary Metal Manufacturing331221 | 20-99 | ◐ LIKELY ACTIVE |
| SWSouthwestern Wire, INC. McClellan | Mcclellan Park | CA | Primary Metal Manufacturing331222 | 20-99 | ◐ LIKELY ACTIVE |
| SWSouthwestern Wire, Inc. Tulsa | Tulsa | OK | Primary Metal Manufacturing331222 | 20-99 | ◐ LIKELY ACTIVE |
| SLSpartan Light Metal Products, Hannibal, MO | Hannibal | MO | Primary Metal Manufacturing331523 | 20-99 | ◐ LIKELY ACTIVE |
| SLSpartan LMP | Mexico | MO | Primary Metal Manufacturing331523 | 20-99 | ◐ LIKELY ACTIVE |
| SMSSAB Minnesota Inc. | Roseville | MN | Primary Metal Manufacturing331221 | 20-99 | ◐ LIKELY ACTIVE |
| SFStar Fab, LLC (Canfield) | Canfield | OH | Primary Metal Manufacturing331313 | 20-99 | ◐ LIKELY ACTIVE |
| SFSteel fabrication | Kuna | ID | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| SWSteel Warehouse of Illinois | Chicago | IL | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| SMStillwater Mining Company Base Metals Smelter | Columbus | MT | Primary Metal Manufacturing331410 | 20-99 | ◐ LIKELY ACTIVE |
| SCStrand Core | Milton | FL | Primary Metal Manufacturing331222 | 20-99 | ◐ LIKELY ACTIVE |
| SEStryten Energy LLC - KCMO | Kansas City | MO | Primary Metal Manufacturing331491 | 20-99 | ◐ LIKELY ACTIVE |
| SSSTS Steel Technologies,LLC | Houston | TX | Primary Metal Manufacturing331221 | 20-99 | ◐ LIKELY ACTIVE |
| SWSumiden Wire Products Corporation - TX | Dayton | TX | Primary Metal Manufacturing331222 | 20-99 | ◐ LIKELY ACTIVE |
Superior Forge & Steel New Castle | New Castle | PA | Primary Metal Manufacturing331513 | 20-99 | ◐ LIKELY ACTIVE |
| SMSuperior Metals Manufacturing | Chittenango | NY | Primary Metal Manufacturing331512 | 20-99 | ◐ LIKELY ACTIVE |
| SSSuperior Structures, Inc. | Walton | KY | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| SSvbbellevue | Bellevue | ID | Primary Metal Manufacturing331529 | 20-99 | ◐ LIKELY ACTIVE |
| SKSwagelok Koppel | Koppel | PA | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| SKSWVA Kentucky, LLC. | Ashland | KY | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| SMSynergy Manufacturing Inc. | San Luis Obispo | CA | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| TFTaylor Forge Engineered Systems Greeley | Greeley | KS | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| TATexas Aluminum Foundry, Inc. | Fort Worth | TX | Primary Metal Manufacturing331524 | 20-99 | ◐ LIKELY ACTIVE |
| TTTexas Tubulars Products | Lonestar | TX | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| TTTexas Tubulars Products | Lone Star | TX | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| TBThe Boehm Pressed Steel Co | Valley City | OH | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| TTidewood | Tamaqua PA | PA | Primary Metal Manufacturing331314 | 20-99 | ◐ LIKELY ACTIVE |
| TRTIMET Ravenswood | Millwood | WV | Primary Metal Manufacturing331491 | 20-99 | ◐ LIKELY ACTIVE |
| TMTNR Machine, Inc. | Dowling | MI | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| T2Torque 2020 CMA Acquisition LLC | Bolivar | OH | Primary Metal Manufacturing331222 | 20-99 | ◐ LIKELY ACTIVE |
| TSTower Sealants | Gainesville | GA | Primary Metal Manufacturing331318 | 20-99 | ◐ LIKELY ACTIVE |
| TATrialco Aluminum, LLC | Chicago Heights | IL | Primary Metal Manufacturing331314 | 20-99 | ◐ LIKELY ACTIVE |
| THTrienda Holdings LLC | Arlington | TX | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| TGTufts Grinding, Inc. | South Chicago Heights | IL | Primary Metal Manufacturing331221 | 20-99 | ◐ LIKELY ACTIVE |
| UCUnicast Company | Boyertown | PA | Primary Metal Manufacturing331511 | 20-99 | ◐ LIKELY ACTIVE |
| UCUnion City Foundry | Union City | OH | Primary Metal Manufacturing331524 | 20-99 | ◐ LIKELY ACTIVE |