| 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 |
| 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 |
| 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 | Lantana | FL | — | ◇ UNVERIFIED |
| Contech Engineered Solutions LLC | Fort Pierce | FL | — | ◇ UNVERIFIED |
| Contech Engineered Solutions LLC | Pinellas Park | FL | — | ◇ UNVERIFIED |
| CIContinental Industries INC. | Elkhart | IN | — | ◇ 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 |
| CCCraftsman Custom Metals, LLC | Schiller Park | IL | — | ◇ UNVERIFIED |
| CICraftsmen Industries Inc-clay St Plant | Saint Charles | MO | — | ◇ UNVERIFIED |
| CHCrease HVAC, Inc. | Rochester | NY | — | ◇ UNVERIFIED |
| CSCreative Sheet Metal INC | Leeds | UT | — | ◇ UNVERIFIED |
| CSCreer Sheet Metal Works | Provo | UT | — | ◇ UNVERIFIED |
| CMCresco Manufacturing INC | Anaheim | CA | — | ◇ UNVERIFIED |
| CMC&R Machine, LLC | Jacksonville | TX | — | ◇ UNVERIFIED |
| CACrocker Architectural Sheet Metal Co., INC. | Wellesley | MA | — | ◇ UNVERIFIED |
| CACrowe and Downey INC. | Smyrna | GA | — | ◇ UNVERIFIED |
 Crown Products Company INC | Jacksonville | FL | — | ◇ UNVERIFIED |
| CDCrystal Distribution INC | Elk River | MN | — | ◇ UNVERIFIED |
| CICsi Industries, INC. | Fairview | PA | — | ◇ UNVERIFIED |
| CPCurbs Plus INC | El Dorado | KS | — | ◇ UNVERIFIED |
| CPCurbs Plus INC | Ringgold | GA | — | ◇ UNVERIFIED |
| CPCurbs Plus, INC | Glendale | AZ | — | ◇ UNVERIFIED |
| CFCurtiss-wright Flight Systems INC | Fairfield | NJ | — | ◇ UNVERIFIED |
| CACustom Air Ducts By Rick LLC | Saint Louis Park | MN | — | ◇ UNVERIFIED |
| CMCustom-bilt Metals | Mcclellan | CA | — | ◇ UNVERIFIED |
| CCCustom Copper Designs | Edmond | OK | — | ◇ UNVERIFIED |
| CCCustom Corrugated & Supply, LLC | Gray | LA | — | ◇ UNVERIFIED |
| CLCustom Land Holding Company LLC | LaBelle | FL | — | ◇ UNVERIFIED |
| CMCustom Metal Products, INC. | Los Angeles (chatsworth Area) | CA | — | ◇ UNVERIFIED |
| CMCustom Metal Roofing, INC. | Murrayville | GA | — | ◇ UNVERIFIED |
| CMCustom Metals of Virginia | Manassas | VA | — | ◇ UNVERIFIED |
| CSCustom Sheet Metal, INC. | Gaithersburg | MD | — | ◇ UNVERIFIED |
| CSCustom Sheetmetal Services, INC. | Durham | NC | — | ◇ UNVERIFIED |
| CSCustom Stainless Steel Equipment Co. Inc. | LaBelle | FL | — | ◇ UNVERIFIED |
| CSCustom Stainless Steel INC | Shoreview | MN | — | ◇ UNVERIFIED |
| CWCustom Welding INC. | Frenchtown | NJ | — | ◇ UNVERIFIED |
| CECutting Edge Fabrication, INC. | Gastonia | NC | — | ◇ UNVERIFIED |
| CLCW Laser and Fabrication LLC | Grandview | MO | — | ◇ UNVERIFIED |
| CPCw Precision Fabrication and Welding, INC. | Houston | TX | — | ◇ UNVERIFIED |
| CSCwp Sheet Metal, INC. | Geneva | FL | — | ◇ UNVERIFIED |
| CSCw Seahorn Enterprises LTD | Houston | TX | — | ◇ UNVERIFIED |
| CMCygnet Manufacturing CO. INC | Oaks | PA | — | ◇ UNVERIFIED |
| DIDaktronics INC | Redwood Falls | MN | — | ◇ UNVERIFIED |
| DIDalsin Industries INC | Bloomington | MN | — | ◇ UNVERIFIED |
| DMD&a Metal Fabrication INC | Van Nuys | CA | — | ◇ UNVERIFIED |
| DDDan Dee Air INC. | Hutchinson | KS | — | ◇ UNVERIFIED |
 Dane Manufacturing | Waunakee | WI | — | ◇ UNVERIFIED |
| DLDaniels' Louver & Sheet Metal Company, INC. | Mobile | AL | — | ◇ UNVERIFIED |
| DSDaniels Sheet Metal | Orange Beach | AL | — | ◇ UNVERIFIED |
| DMDanny Music Sheet Metal | Lilburn | GA | — | ◇ UNVERIFIED |
| DWDarrell W. Strunk Dba Strunk's Roofing & Home Impr | Lexington | KY | — | ◇ UNVERIFIED |
| DWDasco Welded Products, INC. | Waterbury | CT | — | ◇ UNVERIFIED |
| DMData Metalcraft INC | Chaska | MN | — | ◇ UNVERIFIED |
| DADavid Alan Wright | Coos Bay | OR | — | ◇ UNVERIFIED |
| DWDavid W. Bonacci Dba American Rain Gutter | Sacramento | CA | — | ◇ UNVERIFIED |
| DWDavid Wiest | Knoxville | TN | — | ◇ UNVERIFIED |
| DIDayco, INC. | Mobile | AL | — | ◇ UNVERIFIED |
| DUDayco USA INC. | Clearwater | FL | — | ◇ UNVERIFIED |
