| CRCarpenter's Roofing & Sheet Metal, INC. | West Palm Beach | FL | — | ◇ UNVERIFIED |
| CICartel Industries LLC | Irvine | CA | — | ◇ UNVERIFIED |
| CSCarver Sheet Metal Works, Inc. | Salt Lake City | UT | — | ◇ UNVERIFIED |
| CICastle Industries INC. of Ca. | Ontario | CA | — | ◇ UNVERIFIED |
| CTCastle Tire | West Sacramento | CA | — | ◇ UNVERIFIED |
| CICaterpillar INC | Spokane | WA | — | ◇ UNVERIFIED |
| CICavotec Inet US INC. | Cypress | CA | — | ◇ UNVERIFIED |
| CSCb Strain & Son INC. | Tarrytown | NY | — | ◇ UNVERIFIED |
| CFC&c Fabrication, INC. | Carrollton | GA | — | ◇ UNVERIFIED |
| CCC & C Holdco LLC | Hubbard | OR | — | ◇ UNVERIFIED |
| CDC & D Metal Products, INC. | Thornton | CO | — | ◇ UNVERIFIED |
| CRCedar Rock Holdings, LLC | Lenoir | NC | — | ◇ UNVERIFIED |
| CMCeh Metal Technologies Longmont Division | Longmont | CO | — | ◇ UNVERIFIED |
| CICentek INC / Centek Facility | Oklahoma City | OK | — | ◇ UNVERIFIED |
| CPCenterline Prefab LLC | Grand Rapids | MI | — | ◇ UNVERIFIED |
| CSCenter Sheet Metal, INC. | Brooklyn | NY | — | ◇ UNVERIFIED |
| CMCenterville Manufacturing LLC | Centerville | SD | — | ◇ UNVERIFIED |
| CCCentral Cal Metals | Fresno | CA | — | ◇ UNVERIFIED |
| CFCentral Florida Metals AND Central FL Metals, LLC | Orlando | FL | — | ◇ UNVERIFIED |
| CKCentral Kentucky Industrial INC | Richmond | KY | — | ◇ UNVERIFIED |
| COCentral Ohio Sheet Metal Company | Reynoldsburg | OH | — | ◇ UNVERIFIED |
| CSCentral Sheet Metal, LLC | Seminole | OK | — | ◇ UNVERIFIED |
| CSCentral Sheet Metal, LLC | Wichita Falls | TX | — | ◇ UNVERIFIED |
| CSCentral Sheet Metal Products, INC. | Skokie | IL | — | ◇ UNVERIFIED |
| CSCentral States Manufacturing, INC. | Hartford | SD | — | ◇ UNVERIFIED |
| CWCentral Wisconsin Flex | Weston | WI | — | ◇ UNVERIFIED |
| CICew INC | Bakersfield | CA | — | ◇ UNVERIFIED |
| CMCfc Manufacturing Co., INC. | Carbondale | PA | — | ◇ UNVERIFIED |
| CHCfm Heating & Air Conditioning INC | Ogden | UT | — | ◇ UNVERIFIED |
| CMChadwick Manufacturing, LTD. | Chadwick | IL | — | ◇ UNVERIFIED |
| CTChamco Tools | Kansas City | MO | — | ◇ UNVERIFIED |
| CMChampagne Metals | South Charleston | WV | — | ◇ UNVERIFIED |
 Chancey Metals Ramonda Blvd Facility | Jacksonville | FL | — | ◇ UNVERIFIED |
 Chandler Industries INC Stremel Division | Minneapolis | MN | — | ◇ UNVERIFIED |
| CHCharlotte Harbor Custom Upholstery, LLC | Port Charlotte | FL | — | ◇ UNVERIFIED |
| CWCheckpoint Welding - Fabrication INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| CWChenoa Welding & Fabrication, INC. | Chenoa | IL | — | ◇ UNVERIFIED |
| CBChicago Blow Pipe Company | Marquette | MI | — | ◇ UNVERIFIED |
| CMChi Manufacturing, INC. | Englewood | CO | — | ◇ UNVERIFIED |
| CWChristian W K Metal Works | Bristol | TN | — | ◇ UNVERIFIED |
| CRChristopher Ray Stilson | Port Allegany | PA | — | ◇ UNVERIFIED |
| CICirclemaster, INC | Santee | CA | — | ◇ UNVERIFIED |
| CSCitory Solutions, LLC | Saint Cloud | FL | — | ◇ UNVERIFIED |
| CMC&j Metal Products | Paramount | CA | — | ◇ UNVERIFIED |
| CICkkm INC | Corona | CA | — | ◇ UNVERIFIED |
| CCClabber Creek Closet Co. | Mchenry | IL | — | ◇ UNVERIFIED |
| CIClad Industries LLC | Macedon | NY | — | ◇ UNVERIFIED |
| CIClamp It Coping LLC | Springville | UT | — | ◇ UNVERIFIED |
| CGClassic Gutter Systems LLC | Galesburg | MI | — | ◇ UNVERIFIED |
| CSClassic Sheet Metal, INC. | Franklin Park | IL | — | ◇ UNVERIFIED |
| CMCleasby Mfg of Denver | Westminster | CO | — | ◇ UNVERIFIED |
| CMClifco Metal Mfg. INC | Roy | UT | — | ◇ UNVERIFIED |
| CSClifco Sheet Metal Manufacturing LLC | Portland | OR | — | ◇ UNVERIFIED |
| CCClimate Control CO | Morgantown | WV | — | ◇ UNVERIFIED |
| CLC L Rieckhoff CO | Taylor | MI | — | ◇ UNVERIFIED |
| CICm&b, INC. | Oakland | CA | — | ◇ UNVERIFIED |
| CCCMC Commercial Real Estate, LLC | Clinton Township | MI | — | ◇ UNVERIFIED |
| CMCmf (custom Metal Fabricators) | Orange | CA | — | ◇ UNVERIFIED |
| CSCoast Sheet Metal INC | Costa Mesa | CA | — | ◇ UNVERIFIED |
| CSCoast Sheet Metal, INC. | Huntington Beach | CA | — | ◇ UNVERIFIED |
| CTCoast to Coast Metal Finishing CORP | Alhambra | CA | — | ◇ UNVERIFIED |
| CBCOBA by DKH, LLC | El Paso | TX | — | ◇ UNVERIFIED |
| CDCobalt Development, Inc. | Arlington | WA | — | ◇ UNVERIFIED |
| CICobraa, INC. | Aviston | IL | — | ◇ UNVERIFIED |
| CCody | San Antonio | TX | — | ◇ UNVERIFIED |
| CSCoil Steel Processing LLC | Toledo | OH | — | ◇ UNVERIFIED |
| CIColmac Industries Site | Colville | WA | — | ◇ UNVERIFIED |
| CMColored Metal Products, INC. | Shelby | NC | — | ◇ UNVERIFIED |
| CCCommercial Cooling-par Engineering INC | City of Industry | CA | — | ◇ UNVERIFIED |
| CFCommercial Fabricating & Engineering INC | Highland | MI | — | ◇ UNVERIFIED |
| CPCommercial Products Group - Rps | Bensenville | IL | — | ◇ UNVERIFIED |
| CSCommercial Sheet Metal | Canton | MA | — | ◇ UNVERIFIED |
| CSCommercial Stainless Fabricators, INC. | Marietta | GA | — | ◇ UNVERIFIED |
| CFConcrete Forms Services LLC | West Jordan | UT | — | ◇ UNVERIFIED |
| CIConfortaire INC | Tupelo | MS | — | ◇ UNVERIFIED |
| CMConnelly Mechanical INC. | Springfield | MO | — | ◇ UNVERIFIED |
| CEConquest Engineering Company INC | Shoreview | MN | — | ◇ UNVERIFIED |
| CAConroe Awning and Screen INC. | Montgomery | TX | — | ◇ UNVERIFIED |
| CAConstellium-uacj Abs LLC | Bowling Green | KY | — | ◇ UNVERIFIED |
| CSConstructive Sheet Metal INC | Grand Rapids | MI | — | ◇ UNVERIFIED |
 Contech Engineered Solutions LLC | Pinellas Park | FL | — | ◇ UNVERIFIED |
| Contech Engineered Solutions LLC | Fort Pierce | FL | — | ◇ UNVERIFIED |
| Contech Engineered Solutions LLC | Lantana | FL | — | ◇ UNVERIFIED |
| CIContinental Industries INC. | Elkhart | IN | — | ◇ UNVERIFIED |
| CTContinental Tent Mfg, INC. | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| CBCooper B-line | Aurora | CO | — | ◇ UNVERIFIED |
| CLCoopers LLC | Boyertown | PA | — | ◇ UNVERIFIED |
| CCCopper Capital Investment Corporation | Tucson | AZ | — | ◇ UNVERIFIED |
| CCCopper Construction Company, INC. | Vidalia | GA | — | ◇ UNVERIFIED |
| CICorban Industries INC | Belton | MO | — | ◇ UNVERIFIED |
| CMCordeck Manufacturing | Denton | TX | — | ◇ UNVERIFIED |
| CMCoren Metal Crafts, CO. | Bensalem | PA | — | ◇ UNVERIFIED |
| CICorrugated Industries, INC. | Chalmette | LA | — | ◇ UNVERIFIED |
| CICorrugated Industries of Florida, INC | Tampa | FL | — | ◇ UNVERIFIED |
| CMCountywide Mechanical System, INC | Cajon | CA | — | ◇ UNVERIFIED |
| CBCouvrette Building Systems | Salem | VA | — | ◇ UNVERIFIED |
| CMCox Machine | Harper | KS | — | ◇ UNVERIFIED |
| CFCpc Fabrication INC | Santa Ana | CA | — | ◇ UNVERIFIED |
| CECph Enterprises INC. | Bruce | WI | — | ◇ UNVERIFIED |
| CICrafts INC. | Manitowoc | WI | — | ◇ UNVERIFIED |
