| 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 |
| DDDay Dex CO. | Miami | FL | — | ◇ 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 |
| DDD & D Design Manufacturing INC. | Oklahoma City | OK | — | ◇ 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 |
| DADesign and Fabricating INC | Cokato | MN | — | ◇ UNVERIFIED |
| DADesign and Fabricating INC | Cokato | MN | — | ◇ UNVERIFIED |
 Design Engineering & Manufacturing CO | Braham | MN | — | ◇ UNVERIFIED |
