| LILodi Iron Works | Galt | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| MMMetso Minerals Industries INC | Birmingham | AL | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| MOMetso Outotec USA INC | Warrenton | MO | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| MSMichigan Steel, INC. | Muskegon | MI | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| MAMidwest Alloys Foundry | O Fallon | MO | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| MFMidwest Fabrication and Steel LLC | Pueblo | CO | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| MFMission Foundry INC | Omaha | NE | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| MSMissouri Steel Castings Incorporated | Joplin | MO | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| MPModern Pattern & Foundry CO. INC. (mp) | Vernon | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| MMMoment Metal LLC | Albany | NY | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| NMNational Metal Abrasive Company | Wadsworth | OH | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| NCNorthwest Castings | Seattle | WA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| OSOmaha Steel Castings CO | Omaha | NE | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| PCPacific Car and Foundry CO | Renton | WA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| PCPenncast Corp/marietta | Marietta | PA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| PSPennsylvania Steel Fndy & Machine CO | Hamburg | PA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| PDPentz Design Pattern and Foundry INC | Duvall | WA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| PCPride Cast Metals | Cincinnati | OH | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| PVPro V Enterprises | Dearborn | MI | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| RSRacine Steel Castings Div | Racine | WI | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| RFRichmond Foundry | Richmond | TX | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| RERoemer Electric Steel Foundry | Longview | WA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| SFSeabee Foundry | Hampton | IA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| SSSivyer Steel CORP | Bettendorf | IA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| SBState Brass Foundry | Salt Lake City | UT | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| SSSterling Steel Foundry | Sauget | IL | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| SSSupreme Steel Portland | Portland | OR | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| TSTexas Steel CO | Fort Worth | TX | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| TITms Intl Llc/eighty Four Fac | Eighty Four | PA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| TCTusco Casting CORP. | Lodi | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| UWUnitized West | Chehalis | WA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| WSWestern Steel Casting CO | Seattle | WA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| ASAmerican Spincast Inc. | Belton | TX | Primary Metal Manufacturing331513 | 20-99 | ◐ LIKELY ACTIVE |
| BABadger Alloys- Machine shop | Milwaukee | WI | Primary Metal Manufacturing331513 | 1-19 | ◐ LIKELY ACTIVE |
| BABadger Alloys- Pattern Shop | Milwaukee | WI | Primary Metal Manufacturing331513 | 1-19 | ◐ LIKELY ACTIVE |
| CCCol-Pump Company | Columbiana | OH | Primary Metal Manufacturing331513 | 20-99 | ◐ LIKELY ACTIVE |
| DADavis Alloys Manufacturing, LLC | Sharpsville | PA | Primary Metal Manufacturing331513 | 20-99 | ◐ LIKELY ACTIVE |
| ESEllwood Specialty Metals Company | New Castle | PA | Primary Metal Manufacturing331513 | — | ◐ LIKELY ACTIVE |
| ESEllwood Specialty Metals Company | Stow | OH | Primary Metal Manufacturing331513 | — | ◐ LIKELY ACTIVE |
| EGESCO Group LLC - Portland Head Office | Portland | OR | Primary Metal Manufacturing331513 | 100-499 | ◐ LIKELY ACTIVE |
| JIJgx Industries LLC | Gettysburg | PA | Primary Metal Manufacturing331513 | — | ◐ LIKELY ACTIVE |
Sawbrook Steel Casting LLC | Lockland | OH | Primary Metal Manufacturing331513 | 20-99 | ◐ LIKELY ACTIVE |
| SBStar Brass Foundry and Refining Company | Salt Lake City | UT | Primary Metal Manufacturing331513 | — | ▲ REPORTED CLOSED |
Superior Forge & Steel New Castle | New Castle | PA | Primary Metal Manufacturing331513 | 20-99 | ◐ LIKELY ACTIVE |
| VIValmet Inc Waukesha Wilmont | Waukesha | WI | Primary Metal Manufacturing331513 | 1-19 | ◐ LIKELY ACTIVE |
| VMVulan Metals Corporation | Tacoma | WA | Primary Metal Manufacturing331513 | 100-499 | ◐ LIKELY ACTIVE |
| WEWeir Esco | Portland | OR | Primary Metal Manufacturing331513 | 20-99 | ◐ LIKELY ACTIVE |
| WEWeir Esco Newton | Newton | MS | Primary Metal Manufacturing331513 | 100-499 | ◐ LIKELY ACTIVE |
| WEWeir ESCO - Plant 3 | Portland | OR | Primary Metal Manufacturing331513 | 20-99 | ◐ LIKELY ACTIVE |
| WCWhemco-steel Castings, INC | Pittsburgh | PA | Primary Metal Manufacturing331513 | — | ◐ LIKELY ACTIVE |