| CMC&c Machining INC | Centerville | IA | — | ◇ UNVERIFIED |
| CDC & D Welding & Fabrication INC | Jonesville | MI | — | ◇ UNVERIFIED |
| CRCenterless Rebuilders INC | New Haven | MI | — | ◇ UNVERIFIED |
| CMCenter Manufacturing Company | Bellevue | OH | — | ◇ UNVERIFIED |
| CFCertified Fabricators INC | Buena Park | CA | — | ◇ UNVERIFIED |
| CMChancey Metal Products, INC. | Jacksonville | FL | — | ◇ UNVERIFIED |
 Chancey Metals LLC Annex | Jacksonville | FL | — | ◇ UNVERIFIED |
| CFCharlette Foundry | Blackstone | MA | — | ◇ UNVERIFIED |
| CEChart Energy & Chemical INC | La Crosse | WI | — | ◇ UNVERIFIED |
| CVChem Valley Machine | Nitro | WV | — | ◇ UNVERIFIED |
 Chief Industries INC Chief Transportation Products | Omaha | NE | — | ◇ UNVERIFIED |
| CLChrysler, LLC | Indianapolis | IN | — | ◇ UNVERIFIED |
| CMCigas Machine Shop INC | Coatesville | PA | — | ◇ UNVERIFIED |
| CMCigas Machine Shop, INC. | Pottstown | PA | — | ◇ UNVERIFIED |
| CMCigas Machine Shop, INC. | Coatesville | PA | — | ◇ UNVERIFIED |
| CCignys | Saginaw | MI | — | ◇ UNVERIFIED |
| CACitation Aluminum, LLC | Bay Minette | AL | — | ◇ UNVERIFIED |
| CAClark Automatic | Rosedale | MD | — | ◇ UNVERIFIED |
| CMClark Metal Prod CO | Blairsville | PA | — | ◇ UNVERIFIED |
| CMClearfield Mach Co/3rd & Everett Streets | Clearfield | PA | — | ◇ UNVERIFIED |
| CPCleveland-cliffs Piedmont | Newton | NC | — | ◇ UNVERIFIED |
| CRClinch River Casting INC. | Caryville | TN | — | ◇ UNVERIFIED |
| CSCmc Steel Us, LLC | Nashville | TN | — | ◇ UNVERIFIED |
| CMColfor Mfg Machining Div Minerva Operations | Minerva | OH | — | ◇ UNVERIFIED |
| CICollis INC | Elizabethtown | KY | — | ◇ UNVERIFIED |
| CCColson Caster Corporation | Jonesboro | AR | — | ◇ UNVERIFIED |
| CBColumbia Business Center Bldg 33 | Vancouver | WA | — | ◇ UNVERIFIED |
| CFColumbiana Foundry CO | Columbiana | OH | — | ◇ UNVERIFIED |
| CSColumbus Steel Castings | Columbus | OH | — | ◇ UNVERIFIED |
| CHCommercial Honing CO | Fontana | CA | — | ◇ UNVERIFIED |
| CMCompatible Manufacturing INC | Marion | MT | — | ◇ UNVERIFIED |
| CSComplete Surface Technologies INC | Clinton Township | MI | — | ◇ UNVERIFIED |
| CSCompx Securityproducts | River Grove | IL | — | ◇ UNVERIFIED |
| CSConnectivity Solutions Mfg Incorporated | Omaha | NE | — | ◇ UNVERIFIED |
| CCConnector Castings INC | Selmer | TN | — | ◇ UNVERIFIED |
| CCConsolidated Casting | Hutchins | TX | — | ◇ UNVERIFIED |
| CPContinental Powertrain USA LLC | Fountain Inn | SC | — | ◇ UNVERIFIED |
| CPControlled Precision Machining INC | Farmington Hills | MI | — | ◇ UNVERIFIED |
| CICooper Ind/corry Plt | Corry | PA | — | ◇ UNVERIFIED |
| CTCooper Tools LLC | Monroe | NC | — | ◇ UNVERIFIED |
| CICopelands, INC. | Ooltewah | TN | — | ◇ UNVERIFIED |
| CFCopper Field Chimney Supply | Aberdeen | NC | — | ◇ UNVERIFIED |
| CICovert Iron Works | Cudahy | CA | — | ◇ UNVERIFIED |
| CBCpeg Buffalo LLC | Tonawanda | NY | — | ◇ UNVERIFIED |
| CFCpi Fibergalss INC | Camden | NJ | — | ◇ UNVERIFIED |
| CMCraft Machine Works Incorporated - 56th Street | Hampton | VA | — | ◇ UNVERIFIED |
| CTCraig Technologies | Seaford | DE | — | ◇ UNVERIFIED |
| CVCrane Valves Fndry Sand Landfill-wa Cnty | Washington | IA | — | ◇ UNVERIFIED |
 Creative Machining Technolgy | Corona | CA | — | ◇ UNVERIFIED |
| CMCreative Metalcraft CORP. | Hiram | GA | — | ◇ UNVERIFIED |
