| CSColumbus Steel Castings | Columbus | OH | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| CMCombined Metals CORP | Bellwood | IL | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CSCommercial Steel Corporation | Glassport | PA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CRCommodity Resource & Envrnmtl | Mojave | CA | Primary Metal Manufacturing331410 | — | ◇ UNVERIFIED |
| CACommonwealth Aluminum Carson Rolling Mill | Long Beach | CA | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| CICommscope INC Sparks Nevada Facility | Sparks | NV | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| CICommscope INC Statesville Plant Inactive | Statesville | NC | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| CEComtech Ef Data CORP | Tempe | AZ | Primary Metal Manufacturing331528 | — | ◇ UNVERIFIED |
| CAConcept Alloys LLC a Close Corporation | Whitmore Lake | MI | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| CCConex Cable LLC | Dekalb | IL | Primary Metal Manufacturing331316 | — | ◇ UNVERIFIED |
| CPConnectivity Products Bsc Division | Leominster | MA | Primary Metal Manufacturing331422 | — | ◇ UNVERIFIED |
| CFConsolidated Fabricators CORP | Vernon | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CSConsolidated Steel Svc | Englewood | CO | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CSContainer Stapling Company | Herrin | IL | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| CCContech Const Prod - Greencastle | Greencastle | PA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
 Contech Engineered Solutions, LLC | Englewood | TN | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| CAContinental Aluminum | New Hudson | MI | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| CMContinental Metals INC | La Salle | IL | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| CAControlled Automation | Bauxite | AR | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CICooper Ind/corry Plt | Corry | PA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CACooper-standard Automotive | Surgoinsville | TN | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| CTCooper Tools LLC | Monroe | NC | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| CLCopperfield LLC | Orleans | IN | Primary Metal Manufacturing331422 | — | ◇ UNVERIFIED |
| CSCopperweld - Stainless Div | Elizabethtown | KY | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| CICopp Industrial Manufacturing | Pomona | CA | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| CWCostco Wholesale | Columbus | OH | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| CICovert Iron Works | Cudahy | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CFCpi Fibergalss INC | Camden | NJ | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| CMCraft Machine Works Incorporated - 56th Street | Hampton | VA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
 Craig Wire Products, LLC | Temple | GA | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| CVCrane Valves Fndry Sand Landfill-wa Cnty | Washington | IA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CICrucible INC Trent Tube Div Plt 1 | East Troy | WI | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| CMCs Metals of La LLC - Convent Facility | Convent | LA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| CWCubit Wire & Cable | Holyoke | MA | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| CACustom Alloy Sales 34p LLC | Prescott | KS | Primary Metal Manufacturing331312 | — | ◇ UNVERIFIED |
| CACustom Alloy Sales INC | Lynwood | CA | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| DCDaiki Corporation | Adairsville | GA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| DCDalton CORP Kendallville Mfg Facility | Kendallville | IN | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| DADamar Aerosystems | Monroe | WA | Primary Metal Manufacturing331316 | — | ◇ UNVERIFIED |
| DBDamascus Bishop Tube/greenville | Greenville | PA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| DTDanaher Tool Group | Gastonia | NC | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| DLDana Liner Foundry and Machine Plant | Richmond | IN | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| DBDanville Brass & Aluminum CO | Danville | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| DSDarlington Shredding INC | Darlington | SC | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| DGData Guide Cable CORP | Gardner | MA | Primary Metal Manufacturing331421 | — | ◇ UNVERIFIED |
| DHDavid H Fell & CO INC | Commerce | CA | Primary Metal Manufacturing331410 | — | ◇ UNVERIFIED |
| DHDavid H. Fell & CO INC | Rio Rancho | NM | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| DPDavis Pipe INC. | Blountville | TN | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| DWDavis Wire Coporation | Hayward | CA | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| DWDavis Wire Pueblo CORP. | Pueblo | CO | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
