| CSCamblin Steel INC | Oakland | CA | — | ◇ UNVERIFIED |
| CSCamblin Steel INC | Coarsegold | CA | — | ◇ UNVERIFIED |
| CMCambridge Metals & Plastics | Cambridge | MN | — | ◇ UNVERIFIED |
| CMCamelot Metals | Blaine | MN | — | ◇ UNVERIFIED |
| CPCampbell's Portable Buildings | Palestine | TX | — | ◇ UNVERIFIED |
| CSCanam Steel Corporation | Buckeye | AZ | — | ◇ UNVERIFIED |
| CECapital Exteriors INC. | Bismarck | ND | — | ◇ UNVERIFIED |
| CECapitol Engineering & Manufacturing CO | Harvey | IL | — | ◇ UNVERIFIED |
| CTCardinal Tool Companyy | Forney | TX | — | ◇ UNVERIFIED |
| CSCargill Steel & Wire (closed) | Nashville | TN | — | ◇ UNVERIFIED |
| CPCarpenter Powder Products INC | Bridgeville | PA | — | ◇ UNVERIFIED |
 Carpenter Technology | Worcester | MA | — | ◇ UNVERIFIED |
| Carpenter Technology Dba Mb Calram LLC | Camarillo | CA | — | ◇ UNVERIFIED |
| Carpenter Technology-tube Div | Union | NJ | — | ◇ UNVERIFIED |
| CMCasara Modern | Huntington Beach | CA | — | ◇ UNVERIFIED |
| CSCascade Steel Rolling Mills, INC. | Mcminnville | OR | — | ◇ UNVERIFIED |
| CMCbr Machinists INC | Laurel | MS | — | ◇ UNVERIFIED |
| CICdp Industries | Latrobe | PA | — | ◇ UNVERIFIED |
| CECenterline Engineering | Comstock Park | MI | — | ◇ UNVERIFIED |
| CICentury International Arms | West Palm Beach | FL | — | ◇ UNVERIFIED |
| CTCentury Tube LLC | Madison | IN | — | ◇ UNVERIFIED |
| CICeradyne INC 3m Company | Irvine | CA | — | ◇ UNVERIFIED |
| CSCertified Steel Company, INC. | Hamilton | NJ | — | ◇ UNVERIFIED |
| CEC E Steel Group | Spring | TX | — | ◇ UNVERIFIED |
| CSCGAR Stainless, LLC | Eastlake | OH | — | ◇ UNVERIFIED |
| CSChamplain Specialty Metals, INC. | Benton Harbor | MI | — | ◇ UNVERIFIED |
| CMCharter Manufacturing Company, INC. | Cleveland | OH | — | ◇ UNVERIFIED |
| CCCherry Construction Systems | Palestine | TX | — | ◇ UNVERIFIED |
| CPChris Plating | Northbrook | IL | — | ◇ UNVERIFIED |
| CSClarion Sintered Metals | Ridgway | PA | — | ◇ UNVERIFIED |
| CDClark Dietrich Building Systems | Baytown | TX | — | ◇ UNVERIFIED |
| CIClark Industrial INC. | Missoula | MT | — | ◇ UNVERIFIED |
| CSClay Smith Engineering INC | Buena Park | CA | — | ◇ UNVERIFIED |
| CMClearfield Metal Tech/clearfield Plt | Clearfield | PA | — | ◇ UNVERIFIED |
| CCCleveland Cliffs Steel Corporation - Ashland | Ashland | KY | — | ◇ UNVERIFIED |
| CSClingan Steel, INC. | Des Plaines | IL | — | ◇ UNVERIFIED |
| CRC&l Repair/fabrication LLC | Martins Ferry | OH | — | ◇ UNVERIFIED |
| CCCmc Construction Services | Columbia | SC | — | ◇ UNVERIFIED |
| CJCmc Joist and Deck | South Plainfield | NJ | — | ◇ UNVERIFIED |
| CJCmc Joist & Deck | Starke | FL | — | ◇ UNVERIFIED |
| CNCmc New Jersey | Sayreville | NJ | — | ◇ UNVERIFIED |
| CRCmc Rebar - Ca - Santa Fe Springs | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| CSCmc Steel Us, LLC - Martinsburg | Martinsburg | WV | — | ◇ UNVERIFIED |
| CMCoastal Manufacturing | Watsonville | CA | — | ◇ UNVERIFIED |
| CICoast Industrial Supply CO INC | Cerritos | CA | — | ◇ UNVERIFIED |
| CSCol-fin Specialty Steel Ii LLC | New Brighton | PA | — | ◇ UNVERIFIED |
| CSColorado Steel & Wire CO | Loveland | CO | — | ◇ UNVERIFIED |
| CMCombined Metals CORP | Bellwood | IL | — | ◇ UNVERIFIED |
| CCometals | Cayce | SC | — | ◇ UNVERIFIED |
| CMCommercial Metals Company | Etiwanda | CA | — | ◇ UNVERIFIED |
