| TMTru-line Manufacturing Company | Decatur | AL | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| UCUnicast Co/boyertown | Boyertown | PA | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| UEUnion Electric Steel Corporation | Valparaiso | IN | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| UAUnited Aluminum CORP | North Haven | CT | Primary Metal Manufacturing331315 | 100-499 | ◐ LIKELY ACTIVE |
| UCUnited Copper Industries | Denton | TX | Primary Metal Manufacturing331420 | — | ◐ LIKELY ACTIVE |
| USUnited States Steel Corporationfairfield Pipe Mil | Fairfield | AL | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| UAUniversal Alloy Corporation - Ball Ground | Ball Ground | GA | Primary Metal Manufacturing331318 | 100-499 | ◐ LIKELY ACTIVE |
| UFUrick Foundry Co/erie | Erie | PA | Primary Metal Manufacturing331221 | — | ◐ LIKELY ACTIVE |
| UGUS Gypsum Corporation Auburn | Auburn | WA | Nonmetallic Mineral Product Manufacturing327420 | 20-99 | ◐ LIKELY ACTIVE |
| UPUS Pipe & Foundry CO | Bessemer | AL | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| UCUss Corp/edgar Thomson Works | Braddock | PA | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| UMUss Mon Valley Works - Irvin Plant | West Mifflin | PA | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| USUS Steel Fairless Hills Works | Fairless Hills | PA | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| UZUS Zinc Houston Dust Plant | Houston | TX | Primary Metal Manufacturing331314 | — | ◐ LIKELY ACTIVE |
| UZUS Zinc - Metal | Houston | TX | Primary Metal Manufacturing331492 | — | ◐ LIKELY ACTIVE |
| VSVallourec Star, LP | Youngstown | OH | Primary Metal Manufacturing331110 | 500+ | ◐ LIKELY ACTIVE |
| VTVallourec Tube Alloy | Houston | TX | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| VSVast Sumitec INC | Benton Harbor | MI | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| EE(veolia) Elemental Environmental Solutions LLC - Gum Springs Plant | Arkadelphia | AR | Primary Metal Manufacturing331312 | — | ◐ LIKELY ACTIVE |
| VMVestal Manufacturing Company | Sweetwater | TN | Primary Metal Manufacturing331511 | 100-499 | ◐ LIKELY ACTIVE |
| VMVestal Mfg CO | Sweetwater | TN | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| VVistawall | Terrell | TX | Primary Metal Manufacturing331316 | — | ◐ LIKELY ACTIVE |
| VAVistawall Architectural Prods | Midway | TN | Primary Metal Manufacturing331316 | — | ◐ LIKELY ACTIVE |
| VEVitex Extrusion | Franklin | NH | Primary Metal Manufacturing331316 | 20-99 | ◐ LIKELY ACTIVE |
| VPVoestalpine Precision Strip LLC | Pleasant Prairie | WI | Primary Metal Manufacturing331221 | 20-99 | ◐ LIKELY ACTIVE |
| VCVorteq Coil Finishers Llc/allentown | Allentown | PA | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| VIVwm-republic, INC. | Cleveland | OH | Primary Metal Manufacturing331410 | — | ◐ LIKELY ACTIVE |
| WPWacker Polysilicon North America | Charleston | TN | Chemical Manufacturing325132 | 500+ | ◐ LIKELY ACTIVE |
| WVWaterman Valve, LLC | Exeter | CA | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| WIWatry Industries | Sheboygan | WI | Primary Metal Manufacturing331524 | 100-499 | ◐ LIKELY ACTIVE |
| WFWaukesha Foundry INC | Waukesha | WI | Primary Metal Manufacturing331510 | — | ◐ LIKELY ACTIVE |
| WCWeatherly Casting & Mach CO Llc/weatherly Plt | Weatherly | PA | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| WIWebco Industries, Star Center Tube | Sand Springs | OK | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| WVWebster Valve | Franklin | NH | Primary Metal Manufacturing331528 | — | ◐ LIKELY ACTIVE |
| WMWeil Mclain a United Dominion Company | Michigan City | IN | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| WEWenthe-davidson Engineering CO | New Berlin | WI | Primary Metal Manufacturing331221 | 100-499 | ◐ LIKELY ACTIVE |
| WCWescast Casting Cordele LLC | Cordele | GA | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| WEWestern Extrusions | Carrollton | TX | Primary Metal Manufacturing331316 | — | ◐ LIKELY ACTIVE |
| WPWheeling Pittsburgh Steel Plant - Mingo Junction Facility | Mingo Junction | OH | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| WTWieland Thermal Solutions | Cuba | MO | Primary Metal Manufacturing331420 | 20-99 | ◐ LIKELY ACTIVE |
| WMWindsor Machine & Stamping US LTD | Taylor | MI | Primary Metal Manufacturing331222 | — | ◐ LIKELY ACTIVE |
| WCWismarq CORP | Jackson | TN | Primary Metal Manufacturing331221 | — | ◐ LIKELY ACTIVE |
| WSWmc Steel | Conroe | TX | Primary Metal Manufacturing331221 | 20-99 | ◐ LIKELY ACTIVE |
| WTWolf Tech Llc/douglassville | Douglassville | PA | Primary Metal Manufacturing331512 | — | ◐ LIKELY ACTIVE |
| WCWorthington Cylinders Mississippi LLC | New Albany | MS | Primary Metal Manufacturing331221 | — | ◐ LIKELY ACTIVE |
| WSW Silver | Vinton | TX | Primary Metal Manufacturing331110 | 100-499 | ◐ LIKELY ACTIVE |
| WFWyman-gordon Forgings INC | Houston | TX | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| WIWyman-gordon Investment Castings, Incorporated | Groton | CT | Primary Metal Manufacturing331512 | — | ◐ LIKELY ACTIVE |
| WTWyman-gordon Titanium Castings | Albany | OR | Primary Metal Manufacturing331528 | — | ◐ LIKELY ACTIVE |
| YAYkk Ap America INC | Dublin | GA | Primary Metal Manufacturing331313 | — | ◐ LIKELY ACTIVE |