| CPCustom Packline Engineering | Visalia | CA | — | ◇ UNVERIFIED |
| CSCustom Sheet and Plate, LLC | Tarentum | PA | — | ◇ UNVERIFIED |
| CSCustom Sheet and Steel Fabrication INC. | Council Grove | KS | — | ◇ UNVERIFIED |
| CSCustom Sheet & Steel Fabricators | Council Grove | KS | — | ◇ UNVERIFIED |
| CSCustom Steel Fabricators, INC. | Randleman | NC | — | ◇ UNVERIFIED |
| CSCustom Steel Manufacturing INC. | Belton | MO | — | ◇ UNVERIFIED |
| CSCustom Steel Service | Ames | IA | — | ◇ UNVERIFIED |
| CACut Apart Metal Art | Aurora | CO | — | ◇ UNVERIFIED |
| CICv International INC | Torrance | CA | — | ◇ UNVERIFIED |
| CFCyncal Fabricators Inc | Bay Shore | NY | — | ◇ UNVERIFIED |
| CSCynergy Systems, INC. | Delray Beach | FL | — | ◇ UNVERIFIED |
| DEDade Engineering Group LLC | Miami | FL | — | ◇ UNVERIFIED |
| DUDaeil USA Corporation | Valley | AL | — | ◇ UNVERIFIED |
| DID'agostino Iron Works | East Rochester | NY | — | ◇ UNVERIFIED |
| DMDaher-tli Manufacturing | Abingdon | VA | — | ◇ UNVERIFIED |
| DIDalco Industries | Billings | MT | — | ◇ UNVERIFIED |
| DIDalco Industries, INC. | Denver | CO | — | ◇ UNVERIFIED |
| DADaniel Alfred Candelaria, an Individual | Lathrop | CA | — | ◇ UNVERIFIED |
| DDDaniel Dole, Artist Blacksmith | Berkeley | CA | — | ◇ UNVERIFIED |
| DLDaniel Lang | Roseburg | OR | — | ◇ UNVERIFIED |
| DSDan's Steel Company | Salem | OR | — | ◇ UNVERIFIED |
| DSDan's Steel Company INC | Salem | OR | — | ◇ UNVERIFIED |
| DMDark Metal Machine Works | Oakland | CA | — | ◇ UNVERIFIED |
| DMDavid Maldonado | San Marcos | CA | — | ◇ UNVERIFIED |
| DMDavid Marx, CO | Kenner | LA | — | ◇ UNVERIFIED |
| DRDavid Rosa, an Individual | Lathrop | CA | — | ◇ UNVERIFIED |
| DWDavid Whitlow Dba Whitco Steel Fabricators | Adamsville | TN | — | ◇ UNVERIFIED |
| DVDa Vinci Metal Works, LLC | Chula Vista | CA | — | ◇ UNVERIFIED |
| DFDavis Fabricators, INC. | Oak Harbor | OH | — | ◇ UNVERIFIED |
| DGDavis Gregg Enterprises INC | Santee | CA | — | ◇ UNVERIFIED |
| DSDayton Steel Fabricators | Houston | TX | — | ◇ UNVERIFIED |
 Dayton Superior | Valparaiso | IN | — | ◇ UNVERIFIED |
| Dayton Superior Corporation | New Braunfels | TX | — | ◇ UNVERIFIED |
| DBDb Building Fasteners INC | Ontario | CA | — | ◇ UNVERIFIED |
| DBD B Western INC | North Bend | OR | — | ◇ UNVERIFIED |
| DCD. Clement, INC. | Dunstable | MA | — | ◇ UNVERIFIED |
| DIDcs Industries LLC | Phoenix | AZ | — | ◇ UNVERIFIED |
| DMD&d Mobile Welding and Fabrication, INC. | Fort Pierce | FL | — | ◇ UNVERIFIED |
| DWD&d Weld Fab, INC | Centerville | LA | — | ◇ UNVERIFIED |
| DDD & D Welding/fab INC. | Centerville | LA | — | ◇ UNVERIFIED |
| DADe Anza Contractors INC | Riverside | CA | — | ◇ UNVERIFIED |
| DIDedoes Innovative Manufacturing INC | Fowlerville | MI | — | ◇ UNVERIFIED |
| DJDe Jong Iron Works | Orangeburg | NY | — | ◇ UNVERIFIED |
| DFDelco Fabrication LLC | New Orleans | LA | — | ◇ UNVERIFIED |
| DLDe Loera LLC | Los Angeles | CA | — | ◇ UNVERIFIED |
| DFDelta Fabrication, LLC | Greenville | MS | — | ◇ UNVERIFIED |
| DFDelta Fabrication & Machine, INC. | Daingerfield | TX | — | ◇ UNVERIFIED |
| DIDelta Ironworks INC | Prunedale | CA | — | ◇ UNVERIFIED |
| DWDeluxe Welding, INC. | Reno | NV | — | ◇ UNVERIFIED |
| DEDelwood Equipment LTD | — | WV | — | ◇ UNVERIFIED |
| DCDemag Cranes and Components CORP. (1318535255) | Solon | OH | — | ◇ UNVERIFIED |
| DSDemuth Steel Products, INC. | Mount Joy | PA | — | ◇ UNVERIFIED |
| DIDenios INC | Okolona | KY | — | ◇ UNVERIFIED |
| DBDenpak Bldg Products INC | Adams Cnty | CO | — | ◇ UNVERIFIED |
| DBDenpak Building Products INC | Denver | CO | — | ◇ UNVERIFIED |
| DWDentoni's Welding Works INC | Stockton | CA | — | ◇ UNVERIFIED |
| DWDentoni's Welding Works, INC. | Stockton | CA | — | ◇ UNVERIFIED |
| DADepottey Acquisitions Dba Econ-o-line Abrasive Prod INC | Grand Haven | MI | — | ◇ UNVERIFIED |
| DIDerlan INC | Santa Ana | CA | — | ◇ UNVERIFIED |
| DHDerouin Holdings, LLC | Richmond | CA | — | ◇ UNVERIFIED |
| DODesert Owl Forge LLC | Pahrump | NV | — | ◇ UNVERIFIED |
| DTDesert Tanks | Lubbock | TX | — | ◇ UNVERIFIED |
| DPDesigner Palms INC | Andover | KS | — | ◇ UNVERIFIED |
| DHDesign Hardware | Mesquite | TX | — | ◇ UNVERIFIED |
| DSDe Steel, INC | Calhan | CO | — | ◇ UNVERIFIED |
| DTDetroit Tool & Metal Products | Fort Madison | IA | — | ◇ UNVERIFIED |
| DADevincenzi Architectural Products | Burlingame | CA | — | ◇ UNVERIFIED |
| DGDfw Grating, INC. | Dallas | TX | — | ◇ UNVERIFIED |
 DGG Industries, Inc. | Attleboro | MA | — | ◇ UNVERIFIED |
| DWDg Welding and Design, LLC | Malta | OH | — | ◇ UNVERIFIED |
| DWDg Welding - Manufacturing INC | Saint Paul | MN | — | ◇ UNVERIFIED |
| DDDh Docks LLC | Nisswa | MN | — | ◇ UNVERIFIED |
| DSDh Steel Products, LLC | Erie | PA | — | ◇ UNVERIFIED |
| DCDiadochi Capital LLC | Lake Worth Beach | FL | — | ◇ UNVERIFIED |
| DWDiamond Welding INC | Honolulu | HI | — | ◇ UNVERIFIED |
| DRDiaz Roofing and Sheet Metal | Violet | LA | — | ◇ UNVERIFIED |
| DIDi-cor Industries, INC. | Bristol | CT | — | ◇ UNVERIFIED |
| DSDie Stampco INC | Bay City | MI | — | ◇ UNVERIFIED |
| DPDi Primo Fabricators INC - Watson Industrial Park | Saint Louis | MO | — | ◇ UNVERIFIED |
| DSDirect Source Supply INC. | Mamaroneck | NY | — | ◇ UNVERIFIED |
| DIDiscount Iron Fence & Gate, INC. | Cerritos | CA | — | ◇ UNVERIFIED |
| DIDistinctive Iron LLC | Elk River | MN | — | ◇ UNVERIFIED |
| DHDiversified Holdings of Dallas, INC. | Dallas | NC | — | ◇ UNVERIFIED |
| DSDiversified Steel Fabricators, INC. | Montgomery | AL | — | ◇ UNVERIFIED |
| D5Division 5 Florida, INC. | Starke | FL | — | ◇ UNVERIFIED |
| D5Division 5, INC. | Winston | GA | — | ◇ UNVERIFIED |
| DVDivision V Sheetmetal INC | Saint Paul | MN | — | ◇ UNVERIFIED |
| DEDjb Enterprises LTD. | Phoenix | AZ | — | ◇ UNVERIFIED |
| DLD & L Fabricating, INC. | Phoenix | AZ | — | ◇ UNVERIFIED |
| DLD & L Ornamental Iron | Chanute | KS | — | ◇ UNVERIFIED |
| DGDLT Group, Inc. | Highland | MI | — | ◇ UNVERIFIED |
| DEDmc Enterprises | La Vergne | TN | — | ◇ UNVERIFIED |
| DMD & M Iron Works INC | Roseville | MN | — | ◇ UNVERIFIED |
| DSD.m.s. Shredding, INC. | Hanover Township | PA | — | ◇ UNVERIFIED |
| DADo All Industries USA LTD | Glenburn | ND | — | ◇ UNVERIFIED |
| DSDogan Steel, INC. | Northport | AL | — | ◇ UNVERIFIED |
| DFDog Fabrication and Design LLC | Mooresville | NC | — | ◇ UNVERIFIED |
| DSDoing Steel, INC. | Stillwater | OK | — | ◇ UNVERIFIED |
| DFDonald F. Deaven INC. | Wilmington | DE | — | ◇ UNVERIFIED |
| DFDonald F. Deaven INC. | Newark | DE | — | ◇ UNVERIFIED |
