| CTCanfield Technologies | Sayreville | NJ | Primary Metal Manufacturing331491 | — | ◐ LIKELY ACTIVE |
| CACardinal Aluminum Company Plant 3 | Louisville | KY | Primary Metal Manufacturing331316 | — | ◐ LIKELY ACTIVE |
| CMCardinal Manufacturing Company INC | Louisville | KY | Leather and Allied Product Manufacturing316998 | 20-99 | ◐ LIKELY ACTIVE |
Carpenter Technology CORP | Reading | PA | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| CFCarrier Franklin | Franklin | KY | Primary Metal Manufacturing331420 | 20-99 | ◐ LIKELY ACTIVE |
| CDCascade Die Casting / Atlantic | High Point | NC | Primary Metal Manufacturing331521 | — | ◐ LIKELY ACTIVE |
| CICastalloy, INC. | Waukesha | WI | Primary Metal Manufacturing331510 | — | ◐ LIKELY ACTIVE |
| CPCast Products INC | Norridge | IL | Primary Metal Manufacturing331522 | 100-499 | ◐ LIKELY ACTIVE |
| CICaterpillar INC - Mapleton Facility | Mapleton | IL | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| CMCcl Metal Science LLC | Clinton | NC | Primary Metal Manufacturing331314 | 100-499 | ◐ LIKELY ACTIVE |
| CMC.c. Metals and Alloys LLC | Calvert City | KY | Primary Metal Manufacturing331110 | 100-499 | ◐ LIKELY ACTIVE |
| CICedartown Industries, INC. | Cedartown | GA | Wood Product Manufacturing321999 | 100-499 | ◐ LIKELY ACTIVE |
Cenergy LLC | Milton | WV | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| CMCentral Motor Wheel of America INC | Paris | KY | Primary Metal Manufacturing331521 | 500+ | ◐ LIKELY ACTIVE |
| CCCerro Copper Casting | Mexico | MO | Primary Metal Manufacturing331525 | — | ◐ LIKELY ACTIVE |
| CFCerro Flow Products LLC Shelbina | Shelbina | MO | Primary Metal Manufacturing331420 | — | ◐ LIKELY ACTIVE |
| CWCerro Wire and Cable Company | Ogden | UT | Primary Metal Manufacturing331318 | — | ◐ LIKELY ACTIVE |
| CSCharleston Steel | Dunbar | WV | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| CWCharter Wire, LLC | Milwaukee | WI | Primary Metal Manufacturing331210 | 100-499 | ◐ LIKELY ACTIVE |
| CGChas G Allen CO INC | Barre | MA | Primary Metal Manufacturing331511 | 20-99 | ◐ LIKELY ACTIVE |
| CCChemalloy CO Conshohocken Fac | Conshohocken | PA | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| CSCirba Solutions Us, INC | Lancaster | OH | Primary Metal Manufacturing331314 | — | ◐ LIKELY ACTIVE |
| CCCleveland Cliffs Steel Corp/ Butler Works | Butler | PA | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| CSCleveland-cliffs Steel CORP - Mansfield Facility | Mansfield | OH | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| CSCleveland-cliffs Steel Corporation | Coshocton | OH | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| CMClimax Molybdenum Company | Fort Madison | IA | Chemical Manufacturing325188 | — | ◐ LIKELY ACTIVE |
| CRCmc Rebar | Dallas | TX | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| CSCmc Steel Fabricators | Mesa | AZ | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| CSCmc Steel New Jersey | Sayreville | NJ | Primary Metal Manufacturing331110 | 100-499 | ◐ LIKELY ACTIVE |
| CSCmc Steel Oklahoma | Durant | OK | Primary Metal Manufacturing331110 | 100-499 | ◐ LIKELY ACTIVE |
| CSCmc Steel Us, LLC | Jacksonville | FL | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| CPCoilplus Pennsylvania | Philadelphia | PA | Primary Metal Manufacturing331111 | 20-99 | ◐ LIKELY ACTIVE |
Combined Metals Company LLC - Hampshire | Hampshire | IL | Primary Metal Manufacturing331221 | 100-499 | ◐ LIKELY ACTIVE |
| CMCombined Metals of Chicago | Bristol | CT | Primary Metal Manufacturing331221 | 1-19 | ◐ LIKELY ACTIVE |
| CRCommonwealth Rolled Products | Lewisport | KY | Primary Metal Manufacturing331314 | 500+ | ◐ LIKELY ACTIVE |
| CMConsolidated Metco INC | Monroe | NC | Primary Metal Manufacturing331524 | — | ◐ LIKELY ACTIVE |
| CPConstellium Plant | Muscle Shoals | AL | Primary Metal Manufacturing331315 | — | ◐ LIKELY ACTIVE |
| CCContech Castings | Clarksville | TN | Primary Metal Manufacturing331521 | — | ◐ LIKELY ACTIVE |
Cooper Foundry INC | Kalamazoo | MI | Primary Metal Manufacturing331522 | — | ◐ LIKELY ACTIVE |
| CSCorn States Metal Fabricators INC | West Des Moines | IA | Primary Metal Manufacturing331313 | 20-99 | ◐ LIKELY ACTIVE |
| CECorsair Engineering INC | Flint | MI | Primary Metal Manufacturing331222 | 20-99 | ◐ LIKELY ACTIVE |
| CTCri Transport LLC | Merrimack | NH | Primary Metal Manufacturing331410 | — | ◐ LIKELY ACTIVE |
| CSCronimet Specialty Metals USA INC | Greenville | PA | Primary Metal Manufacturing331492 | — | ◐ LIKELY ACTIVE |
| CCCullman Casting Corporation | Cullman | AL | Primary Metal Manufacturing331511 | 20-99 | ◐ LIKELY ACTIVE |
| CPCulvert Placement and Storage Area Expansion for Waupaca Foundry Plant 5 Facilit | Tell City | IN | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| CFCumberland Foundry Co., INC. | Cumberland | RI | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| CSCustom Steel Processing (2) | Madison | IL | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| DCDalton CORP Warsaw Mfg Facility | Warsaw | IN | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
Dayton Superior CORP | Tremont | PA | Primary Metal Manufacturing331222 | — | ◐ LIKELY ACTIVE |
| DFDecatur Foundry, INC. | Decatur | IL | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |