Adams Thermal Systems INC | Canton | 100–499 | ● ACTIVE |
| AEApplied Engineering, INC. | Yankton | 100–499 | ● ACTIVE |
Dakota Bodies, LLC | Watertown | 100–499 | ● ACTIVE |
Rosenbauer South Dakota, LLC | Lyons | 100–499 | ● ACTIVE |
| DRDell Rapids Custom Trailers, INC. | Dell Rapids | 20–99 | ● ACTIVE |
Trail-eze, INC. | Mitchell | 20–99 | ● ACTIVE |
Trail King Industries, INC | Mitchell | — | ● ACTIVE |
| AMAviation Manufacturing Group, LLC DBA The Freeman Company | Yankton | 20–99 | ● ACTIVE |
Carzdeluxe Designs LLC | Rapid City | — | ● ACTIVE |
D & H Hansen INC | Letcher | — | ● ACTIVE |
| OSOrion Strike Technologies INC. | Parker | — | ● ACTIVE |
Wareing Trailers Belle Fourche LLC | Sturgis | — | ● ACTIVE |
| LML & M Radiator, INC. | Yankton | 100–499 | ◐ LIKELY ACTIVE |
| WTWilson Trailer Company | Lennox | — | ◐ LIKELY ACTIVE |
| HIHorton Industries, INC. - West | Britton | — | ◐ LIKELY ACTIVE |
Trail-eze INC. | Mitchell | — | ◐ LIKELY ACTIVE |
| BFBaldwin Filters INC. | Yankton | — | ◇ UNVERIFIED |
| HTHendrickson Trailer Suspension Systems | Mitchell | — | ◇ UNVERIFIED |
| TLTerex Load King Div | Elk Point | — | ◇ UNVERIFIED |
| TKTrail King Inds INC | Mitchell | — | ◇ UNVERIFIED |
| WTWilson Trailer Company | Yankton | — | ◇ UNVERIFIED |
| TITrail-eze INC | Corsica | — | ◐ LIKELY ACTIVE |
| WTWilson Trailer Yankton | Yankton | 100–499 | ◐ LIKELY ACTIVE |
Dakota Bodies, LLC | Watertown | — | ◐ LIKELY ACTIVE |
| MRMidwest Railcar Repair INC | Brandon | — | ◐ LIKELY ACTIVE |
| TITrail-eze INC. | Platte | — | ◐ LIKELY ACTIVE |
| ACArctic Cat INC. | Madison | — | ◇ UNVERIFIED |
| DMDakota Mfg CO INC | Corsica | — | ◇ UNVERIFIED |
| DMDakota Mfg CO INC | Platte | — | ◇ UNVERIFIED |
| FCFreeman CO Amg LLC | Yankton | — | ◇ UNVERIFIED |
| PIPolaris Industries, INC. Spearfish (former) | Spearfish | — | ◇ UNVERIFIED |
| SESpartan Erv | Brandon | — | ◇ UNVERIFIED |
| TKTrail King Industries | Yankton | — | ◇ UNVERIFIED |
| TKTrail King Industries | Yankton | — | ◇ UNVERIFIED |
AFCO Performance Group dba Legend Suspensions | Sturgis | 20–99 | ◐ LIKELY ACTIVE |
| ADAmerican Defense Builders Trust | Hot Springs | — | ◐ LIKELY ACTIVE |
| AMAviation Manufacturing Group, LLC | Yankton | — | ◐ LIKELY ACTIVE |
| C1Curt - 141 | Brandon | 20–99 | ◐ LIKELY ACTIVE |
| CMCurt Manufacturing LLC | Brandon | — | ◐ LIKELY ACTIVE |
| CTCustom Truck One Source - Elk Point | Elk Point | 20–99 | ◐ LIKELY ACTIVE |
| FYFiltration Yankton | Yankton | 100–499 | ◐ LIKELY ACTIVE |
| HIHorton, Inc Britton | Britton | 100–499 | ◐ LIKELY ACTIVE |
| MAMatthew a Ramsey | Ellsworth Afb | — | ◐ LIKELY ACTIVE |
| MMMatthew Moranor | Hot Springs | — | ◐ LIKELY ACTIVE |
| MMitchell | Mitchell | 20–99 | ◐ LIKELY ACTIVE |
| PHParker Hannifin | Yankton | 100–499 | ◐ LIKELY ACTIVE |
| PSPonderosa Services, INC | Mitchell | — | ◐ LIKELY ACTIVE |
Rosenbauer America LLC | Lyons | — | ◐ LIKELY ACTIVE |
| SLSentry LLC Watertown | Watertown | 100–499 | ◐ LIKELY ACTIVE |
| SBSpartan - Brandon | Brandon | 100–499 | ◐ LIKELY ACTIVE |