| CSCarport Structures CORP | Oxford | MI | — | ◇ UNVERIFIED |
| CMCasara Modern | Huntington Beach | CA | — | ◇ UNVERIFIED |
| CSCascade Steel Rolling Mills, INC. | Mcminnville | OR | — | ◇ UNVERIFIED |
| CPCavett Portable Buildings | Ponca City | OK | — | ◇ UNVERIFIED |
| CICdp Industries | Latrobe | PA | — | ◇ UNVERIFIED |
| CBCeco Building Systems | Mount Pleasant | IA | — | ◇ UNVERIFIED |
| CECenterline Engineering | Comstock Park | MI | — | ◇ UNVERIFIED |
 Central Confinement Service LTD | Albion | NE | — | ◇ UNVERIFIED |
| COCentral Oregon Greenhouse Supply LLC | Bend | OR | — | ◇ UNVERIFIED |
| CSCentral States Manufacturing, INC. | Cedar Hill | TX | — | ◇ UNVERIFIED |
| CSCentral Steel Buildings, Inc. | Mount Airy | NC | — | ◇ UNVERIFIED |
| CTCentury Tube LLC | Madison | IN | — | ◇ UNVERIFIED |
| CSCertified Steel Company, INC. | Hamilton | NJ | — | ◇ UNVERIFIED |
| CEC E Steel Group | Spring | TX | — | ◇ UNVERIFIED |
| CSCfg Systems INC Dba Concelafab Corporation | Colorado Springs | CO | — | ◇ UNVERIFIED |
| CSCGAR Stainless, LLC | Eastlake | OH | — | ◇ UNVERIFIED |
| CSChamplain Specialty Metals, INC. | Benton Harbor | MI | — | ◇ UNVERIFIED |
| CMCharter Manufacturing Company, INC. | Cleveland | OH | — | ◇ UNVERIFIED |
| CMCherokee Metal Building Erectors | Marietta | GA | — | ◇ UNVERIFIED |
| CCCherry Construction Systems | Palestine | TX | — | ◇ UNVERIFIED |
| CTChicago Tube & Iron | Ankeny | IA | — | ◇ UNVERIFIED |
| CMChickasha Manufacturing | Chickasha | OK | — | ◇ UNVERIFIED |
 Chief Industries INC | Grand Island | NE | — | ◇ UNVERIFIED |
| CSCiti Staff Solutions INC | San Dimas | CA | — | ◇ UNVERIFIED |
| CDClark Dietrich Building Systems | Baytown | TX | — | ◇ UNVERIFIED |
| CIClark Industrial INC. | Missoula | MT | — | ◇ UNVERIFIED |
| CMClassic Metals Suppliers, Corp. | Palmetto Bay | FL | — | ◇ UNVERIFIED |
| CSClay Smith Engineering INC | Buena Park | CA | — | ◇ UNVERIFIED |
| CBClearly Building Corporation | Secor | IL | — | ◇ UNVERIFIED |
| CCCleveland Cliffs Steel Corporation - Ashland | Ashland | KY | — | ◇ UNVERIFIED |
| CSCleveland Steel Specialty Company | Bedford | OH | — | ◇ UNVERIFIED |
| CSClingan Steel, INC. | Des Plaines | IL | — | ◇ UNVERIFIED |
| CMClosest Meadow Building, INC. | Clovis | NM | — | ◇ UNVERIFIED |
| CRC&l Repair/fabrication LLC | Martins Ferry | OH | — | ◇ UNVERIFIED |
| CBClyde Bergemann Power Group, INC. | Jesup | GA | — | ◇ UNVERIFIED |
| CCCmc Construction Services | Columbia | SC | — | ◇ 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 |
| CMCnc Metal Solutions, LLC | Champlin | MN | — | ◇ UNVERIFIED |
| CMCoastal Manufacturing | Watsonville | CA | — | ◇ UNVERIFIED |
| CICoast Industrial Supply CO INC | Cerritos | CA | — | ◇ UNVERIFIED |
| CTCoast to Coast Carports INC | Stanfield | OR | — | ◇ UNVERIFIED |
| CICoatek, INC | Santa Clara | CA | — | ◇ UNVERIFIED |
| CACoco Architectural Grilles & Metalcraft & Advanced Architectural Grilles | Holtsville | NY | — | ◇ UNVERIFIED |
| CTColeman Tommy | Memphis | TN | — | ◇ UNVERIFIED |
| CSCol-fin Specialty Steel Ii LLC | New Brighton | PA | — | ◇ UNVERIFIED |
| CSColorado Steel & Wire CO | Loveland | CO | — | ◇ UNVERIFIED |
| CCometals | Cayce | SC | — | ◇ UNVERIFIED |
| CBCommercial Building Components | Lathrop | CA | — | ◇ UNVERIFIED |
