| WWcm | Rapid City | 20–99 | ◐ LIKELY ACTIVE |
| WTWheeler Tank Manufacturing, Inc. | Sioux Falls | 20–99 | ◐ LIKELY ACTIVE |
| 2B2 Brothers Fabrication LLC | Lennox | — | ◇ UNVERIFIED |
| AMAbm Manufacturing LLC | Brookings | — | ◇ UNVERIFIED |
| BSBalance Systems INC. | Sioux Falls | — | ◇ UNVERIFIED |
| BHBlack Hills Railings LLC | Rapid City | — | ◇ UNVERIFIED |
| CMCenterville Manufacturing LLC | Centerville | — | ◇ UNVERIFIED |
| CSCentral States Manufacturing, INC. | Hartford | — | ◇ UNVERIFIED |
| CMCreative Metal Solutions, Inc. | Sioux Falls | — | ◇ UNVERIFIED |
| DCDakota Cable Solutions Inc. | Piedmont | — | ◇ UNVERIFIED |
| EMEnclose Manufacturing, Inc. | Mitchell | — | ◇ UNVERIFIED |
| EMEureka Manufacturing | Eureka | — | ◇ UNVERIFIED |
| FDFormer Dakota Bodies, INC. | Watertown | — | ◇ UNVERIFIED |
| GBGroomers Best, INC. | Brandon | — | ◇ UNVERIFIED |
| HMHyland Machining | Madison | — | ◇ UNVERIFIED |
| JVJustarah Ventures LLC | Tea | — | ◇ UNVERIFIED |
| MJMaguire Jones Boys II, LLC | Sioux Falls | — | ◇ UNVERIFIED |
| MTMaguire Tank, Inc. | Sioux Falls | — | ◇ UNVERIFIED |
| NSNuEra Steel LLC | Viborg | — | ◇ UNVERIFIED |
| PTPermian Tank & Manufacturing INC Belle Fourche Plant | Belle Fourche | — | ◇ UNVERIFIED |
| PIPrairie Industries, LLC | Vale | — | ◇ UNVERIFIED |
| PMPrimary Manufacturing, INC. | Humboldt | — | ◇ UNVERIFIED |
| RMRay Manufacturing LLC | Watertown | — | ◇ UNVERIFIED |
| SESamson Exhaust | Sturgis | — | ◇ UNVERIFIED |
| TTTotally Tubular Mfg., INC. | Aberdeen | — | ◇ UNVERIFIED |
 Truenorth Steel - Huron | Huron | — | ◇ UNVERIFIED |
| TSTwistedsage Studios, Inc. | Buffalo Gap | — | ◇ UNVERIFIED |
| TSTwistedsage Studios, Inc. | Buffalo Gap | — | ◇ UNVERIFIED |
| VLV & L Manufacturing, Inc. | Tea | — | ◇ UNVERIFIED |
| VMV&L Manufacturing, Inc. | Worthing | — | ◇ UNVERIFIED |
