| BEBromley Excavating | Centralia | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| BMBrom Machine & Foundry CO | Winona | MN | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| BFBronzart Foundry INC | Sarasota | FL | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| BEBrubacher Excavating INC | Bowmansville | PA | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| BDBucy Die Casting | Burbank | CA | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| BSBudd Site | Philadelphia | PA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| BMBull Moose Tube | Sinton | TX | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| BMBull Moose Tube CO | Chicago Heights | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| BMBurgess-norton Mfg CO / Std Auto Parts CO Div | Muskegon | MI | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| BGBurns Gauge & Machine, INC | Burns | TN | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| CFCalcagno Foundry | Boring | OR | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| CACaledonian Alloys INC | Monroe | NC | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| CECalifornia Electric Steel INC | Angels Camp | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| CWCalifornia Waste Solutions | Oakland | CA | Primary Metal Manufacturing331000 | — | ◇ UNVERIFIED |
| CMCallen Manufacturing CORP | Northlake | IL | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| CCCamden Casting Center INC | Camden | TN | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CFCampbell Foundry Company | Harrison | NJ | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CPCannon Precision Manufacturing | Keithsburg | IL | Primary Metal Manufacturing331000 | — | ◇ UNVERIFIED |
| CECapitol Engineering & Manufacturing CO | Harvey | IL | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| CMCarbide Metals INC | Youngstown | OH | Primary Metal Manufacturing331410 | — | ◇ UNVERIFIED |
| CICarmack INC Dba Phenix Foundry | Phenix City | AL | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CCCarolina Custom Metal | Cherryville | NC | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
 Carpenter Technology Dba Mb Calram LLC | Camarillo | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| CICarson Ind/freeport | Freeport | PA | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| CDCascade Die Casting / Pacific | City of Industry | CA | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| CICass INC | Oakland | CA | Primary Metal Manufacturing331312 | — | ◇ UNVERIFIED |
| CICastalloy INC Walterboro | Walterboro | SC | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CACast Alloys INC | Northridge | CA | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| CTCast-fab Technologies, INC. | Cincinnati | OH | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CTCasting Technologies Company | Franklin | IN | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| CMCast Metals Technology | Union | OH | Primary Metal Manufacturing331525 | — | ◇ UNVERIFIED |
| CICastronics Incorporated | Medway | MA | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
 Cast Technologies INC. | Peoria | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| CICaterpillar INC Seals Metalcasting Facility | Toccoa | GA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CRCaterpillar Reman Powertrain Indiana, INC | Franklin | IN | Primary Metal Manufacturing331316 | — | ◇ UNVERIFIED |
| CWCavert Wire | Lemont Furnace | PA | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| CMCbr Machinists INC | Laurel | MS | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CMCdc Mead | Mead | WA | Primary Metal Manufacturing331312 | — | ◇ UNVERIFIED |
| CPCedar Poly LLC | Bennett | IA | Primary Metal Manufacturing331419 | — | ◇ UNVERIFIED |
| CACentral Aluminum Company | Columbus | OH | Primary Metal Manufacturing331316 | — | ◇ UNVERIFIED |
| CDCentral Die Casting | Chicago | IL | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| CKCentral Ky Process | Lexington | KY | Primary Metal Manufacturing331410 | — | ◇ UNVERIFIED |
| CSCentral States Refining CO INC | Versailles | MO | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| CSCentral Steel & Wire CO | Chicago | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| CWCentral Wire - Dumas Division | Dumas | AR | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| CPCentric Pipe LLC | Bossier City | LA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| CBCentury Brass Works INC | Swansea | IL | Primary Metal Manufacturing331522 | — | ◇ UNVERIFIED |
| CTCentury Tube CORP | Readington | NJ | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CICeradyne INC 3m Company | Irvine | CA | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
| CFCerro Flow Products INC | Bossier City | LA | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
