| 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 |
| CCCul-mar Creations INC. | Attleboro | MA | — | ◇ 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 |
 Dayton Superior CORP | Elk Grove Village | IL | — | ◇ UNVERIFIED |
| DSDb2 Services | Kansas City | KS | — | ◇ UNVERIFIED |
| DBD & B Metal Roofing Supply INC. | Anniston | AL | — | ◇ UNVERIFIED |
| DDD & D Design Manufacturing INC. | Oklahoma City | OK | — | ◇ UNVERIFIED |
| DSD&d Sheet Metal | Lutz | FL | — | ◇ UNVERIFIED |
| DIDds Industries INC | Fall River | MA | — | ◇ UNVERIFIED |
| DMDefiance Metal Products | Bedford | PA | — | ◇ UNVERIFIED |
| DYDelbert Young Sheet Metal Service | Ardmore | OK | — | ◇ UNVERIFIED |
 Dellinger Enterprises, LTD. | Belmont | NC | — | ◇ UNVERIFIED |
| DCDelta Consolidated, LLC | Harvey | LA | — | ◇ UNVERIFIED |
| DMDelta Metals, LLC | Leon | IA | — | ◇ UNVERIFIED |
| DSDelta Sheet Metal CORP. | New York | NY | — | ◇ UNVERIFIED |
| DSDenning Sheet Metal, INC | Columbia Falls | MT | — | ◇ UNVERIFIED |
| DDDennis Doerr Dba Shafer Metal Fab | Shafer | MN | — | ◇ UNVERIFIED |
| DFDennis Filges Company, INC. | Chicora | PA | — | ◇ UNVERIFIED |
| DBDesign By Initiative LLC | Newnan | GA | — | ◇ UNVERIFIED |
| DMDesigner Metal Works and Lighting, INC. | Ontario | CA | — | ◇ UNVERIFIED |
| DMDewitt Machine & Fabrication, INC. | Medford | ME | — | ◇ UNVERIFIED |
| DADexter Axle, Plant 39 | Bristol | IN | — | ◇ UNVERIFIED |
| DMD.F Metal Supply LLC | Sanford | FL | — | ◇ UNVERIFIED |
| DEDiamante Enterprises, INC. | San Antonio | TX | — | ◇ UNVERIFIED |
| DEDiamond Eye Manufacturing LLC | Athena | OR | — | ◇ UNVERIFIED |
| DMDiamond Metal Products INC | Ham Lake | MN | — | ◇ UNVERIFIED |
| DSDimic Steel Tech, INC. | Upland | CA | — | ◇ UNVERIFIED |
| DWDistrict Welding co., LLC | Oceanside | CA | — | ◇ UNVERIFIED |
| DFDiversified Fabricators, INC. | Clinton Township | MI | — | ◇ UNVERIFIED |
| DMDiversified Metal Fabricators INC | Ferndale | MI | — | ◇ UNVERIFIED |
| DPDiversified Products Mfg | Jacksonville | FL | — | ◇ UNVERIFIED |
| DSDiversified Systems of Jax | Jacksonville | FL | — | ◇ UNVERIFIED |
| D5Division 5 Fabricators, INC. | Russellville | KY | — | ◇ UNVERIFIED |
| D8Division 8 CO INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| DIDkoroza, INC | Hialeah | FL | — | ◇ UNVERIFIED |
| DMDLC Manufacturing & Fabrication, Inc. | New Ulm | MN | — | ◇ UNVERIFIED |
| DMDLT Manufacturing, Inc. | Dallas | TX | — | ◇ UNVERIFIED |
| DGDmc Global | Mount Braddock | PA | — | ◇ UNVERIFIED |
| DID&m, INC | Fairmont | WV | — | ◇ UNVERIFIED |
| DMD M Sabia & CO | Oreland | PA | — | ◇ UNVERIFIED |
| DBDon Bateman Sheet Metal Fabrication | Sapulpa | OK | — | ◇ UNVERIFIED |
| DCDoral Corporation | Milwaukee | WI | — | ◇ UNVERIFIED |
| DCDoral Corporation | Milwaukee | WI | — | ◇ UNVERIFIED |
| DSDoudney Sheet Metal Works INC | Sarasota | FL | — | ◇ UNVERIFIED |
| DDrewfab | West Harrison | IN | — | ◇ UNVERIFIED |
| DLDuctco, LLC | Bloomfield | CT | — | ◇ UNVERIFIED |
| DFDuct Fab, INC. | Houma | LA | — | ◇ UNVERIFIED |
| DFDuct Fabrication Company, INC. | Oklahoma City | OK | — | ◇ UNVERIFIED |
| DSDuct Shop of Nc, INC. | Charlotte | NC | — | ◇ UNVERIFIED |
| DUDucts Unlimited INC. | Smyrna | DE | — | ◇ UNVERIFIED |
| DPDuel Products INC. | Wylie | TX | — | ◇ UNVERIFIED |
