| BBBailsco Blades & Castings INC. | Shreveport | LA | Primary Metal Manufacturing331521 | 20-99 | ◐ LIKELY ACTIVE |
| BMBaker Manufacturing | Evansville | WI | Primary Metal Manufacturing331511 | 100-499 | ◐ LIKELY ACTIVE |
| BCB & C Castings | Barberton | OH | Primary Metal Manufacturing331316 | 20-99 | ◐ LIKELY ACTIVE |
| BMBear Metallurgical Mfg | Butler | PA | Primary Metal Manufacturing331110 | 1-19 | ◐ LIKELY ACTIVE |
| BFBeaver Falls Tubular Products LLC | Beaver Falls | PA | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| BVBeaver Valley Alloy Foundry CO | Monaca | PA | Primary Metal Manufacturing331511 | 20-99 | ◐ LIKELY ACTIVE |
| BTBekaert Tire Reinforcement US Corporation | Rome | GA | Primary Metal Manufacturing331222 | 100-499 | ◐ LIKELY ACTIVE |
| BTBenda Tool & Model Works INC | Hercules | CA | Primary Metal Manufacturing331313 | 20-99 | ◐ LIKELY ACTIVE |
| BTBingham & Taylor CORP. | Culpeper | VA | Primary Metal Manufacturing331511 | 100-499 | ◐ LIKELY ACTIVE |
| BBBlackfoot Brass | Blackfoot | ID | Primary Metal Manufacturing331529 | 20-99 | ◐ LIKELY ACTIVE |
| BCBlast Cleaning Technologies | West Allis | WI | Primary Metal Manufacturing331511 | 100-499 | ◐ LIKELY ACTIVE |
| BABoose at Cornwall INC | Lebanon | PA | Primary Metal Manufacturing331524 | 20-99 | ◐ LIKELY ACTIVE |
| BSBrickham Stamping | Oshkosh | WI | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| BEBriteline Extrusions INC | Summerville | SC | Primary Metal Manufacturing331316 | 20-99 | ◐ LIKELY ACTIVE |
| BWBrookfield Wire CO INC | West Brookfield | MA | Primary Metal Manufacturing331222 | 20-99 | ◐ LIKELY ACTIVE |
| BEBrowning Enterprise, INC. | Attalla | AL | Primary Metal Manufacturing331221 | 20-99 | ◐ LIKELY ACTIVE |
| BMBull Moose Tube | Gerald | MO | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| CCCadillac Casting, INC (b2178) | Cadillac | MI | Primary Metal Manufacturing331511 | 100-499 | ◐ LIKELY ACTIVE |
| CAC a Lawton CO | De Pere | WI | Primary Metal Manufacturing331510 | 100-499 | ◐ LIKELY ACTIVE |
| CFCalhoun Fndy CO INC | Homer | MI | Primary Metal Manufacturing331511 | 20-99 | ◐ LIKELY ACTIVE |
| CSCalifornia Steel Industries INC | Fontana | CA | Primary Metal Manufacturing331110 | 500+ | ◐ LIKELY ACTIVE |
| CLCambridge Lee Plants 2, 3, 4 | Reading | PA | Primary Metal Manufacturing331314 | 100-499 | ◐ LIKELY ACTIVE |
| CMCannon Muskegon CORP | Muskegon | MI | Primary Metal Manufacturing331513 | 100-499 | ◐ LIKELY ACTIVE |
Carpenter Technology CORP | Reading | PA | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| CMCarter Machine Co. Inc. | Galion | OH | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| CDCascade Die Casting / Great La Kes | Sparta | MI | Primary Metal Manufacturing331521 | 100-499 | ◐ LIKELY ACTIVE |
| CICastings, INC | Grand Junction | CO | Primary Metal Manufacturing331314 | 1-19 | ◐ LIKELY ACTIVE |
| CPCast Products INC | Norridge | IL | Primary Metal Manufacturing331522 | 100-499 | ◐ LIKELY ACTIVE |
| CMC.c. Metals and Alloys LLC | Calvert City | KY | Primary Metal Manufacturing331110 | 100-499 | ◐ LIKELY ACTIVE |
| CACelina Aluminum Precision Tech | Celina | OH | Primary Metal Manufacturing331524 | 100-499 | ◐ LIKELY ACTIVE |
| CCCentrifugal Castings | Temple | TX | Primary Metal Manufacturing331513 | 20-99 | ◐ LIKELY ACTIVE |
| CWCerro Wire LLC | Hartselle | AL | Primary Metal Manufacturing331420 | 100-499 | ◐ LIKELY ACTIVE |
| CMCerrowire Mc Cable Plant | Hartselle | AL | Primary Metal Manufacturing331420 | 20-99 | ◐ LIKELY ACTIVE |
| CACertified Alloy Products INC | Long Beach | CA | Primary Metal Manufacturing331492 | 100-499 | ◐ LIKELY ACTIVE |
| CSCharleston Steel | Dunbar | WV | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| CPCharlotte Pipe and Foundry Company | Charlotte | NC | Primary Metal Manufacturing331511 | 500+ | ◐ LIKELY ACTIVE |
| CGChas G Allen CO INC | Barre | MA | Primary Metal Manufacturing331511 | 20-99 | ◐ LIKELY ACTIVE |
| CCChromalloy Castings Tampa CORP | Tampa | FL | Primary Metal Manufacturing331523 | 100-499 | ◐ LIKELY ACTIVE |
| CMCircle Machine Rolls, INC. | Sebring | OH | Primary Metal Manufacturing331513 | 20-99 | ◐ LIKELY ACTIVE |
| CACity Aluminum Foundry | Waterford | MI | Primary Metal Manufacturing331524 | 20-99 | ◐ LIKELY ACTIVE |
| CBClay & Bailey Mfg Company | Kansas City | MO | Primary Metal Manufacturing331511 | 20-99 | ◐ LIKELY ACTIVE |
| CLC L Dews and Sons Foundry and Machinery Company INC | Hattiesburg | MS | Primary Metal Manufacturing331511 | 20-99 | ◐ LIKELY ACTIVE |
| CSCleveland-cliffs Steel Corporation - Zanesville Works | Zanesville | OH | Primary Metal Manufacturing331110 | 100-499 | ◐ LIKELY ACTIVE |
Combined Metals Company LLC - Hampshire | Hampshire | IL | Primary Metal Manufacturing331221 | 100-499 | ◐ LIKELY ACTIVE |
| CMConcast Metal Products CO | Mars | PA | Primary Metal Manufacturing331523 | 20-99 | ◐ LIKELY ACTIVE |
| CPConsolidated Precision Products | Euclid | OH | Primary Metal Manufacturing331512 | 100-499 | ◐ LIKELY ACTIVE |
Cooper Foundry INC | Kalamazoo | MI | Primary Metal Manufacturing331522 | 1-19 | ◐ LIKELY ACTIVE |
| CSCorn States Metal Fabricators INC | West Des Moines | IA | Primary Metal Manufacturing331313 | 20-99 | ◐ LIKELY ACTIVE |
Craftech Metal Forming, INC | Perris | CA | Primary Metal Manufacturing331492 | — | ◐ LIKELY ACTIVE |
| CICrucible Industries LLC | Solvay | NY | Primary Metal Manufacturing331110 | 100-499 | ◐ LIKELY ACTIVE |