 Rubadue Wire CO INC | Loveland | 20–99 | ● ACTIVE |
| ACArc Colorado, INC | Longmont | 100–499 | ● ACTIVE |
 Clayens Us, LLC | Loveland | — | ● ACTIVE |
 Facop LLC | Florence | — | ● ACTIVE |
 Fortius Metals, INC. | Lafayette | — | ● ACTIVE |
 Golden Aluminum INC | Fort Lupton | — | ● ACTIVE |
 Heritage Die Casting Company, INC. | Denver | — | ● ACTIVE |
| HPHigh Plains Steel Services, LLC | Windsor | 20–99 | ● ACTIVE |
 High-tek Tube CORP | Littleton | — | ● ACTIVE |
 Protocast INC | Commerce City | — | ● ACTIVE |
 Steel Ops LTD. | Fort Collins | — | ● ACTIVE |
 Precision Casting Prototypes and Engineering INC | Commerce City | — | ◐ LIKELY ACTIVE |
| ZMZimmerman Metals INC | Denver | 20–99 | ◐ LIKELY ACTIVE |
| PCPerma Cast CO | Pueblo | 1–19 | ◐ LIKELY ACTIVE |
| RMRocky Mountain Steel Mill | Pueblo | — | ◐ LIKELY ACTIVE |
| Golden Aluminum INC. - Fort Lupton Mill | Fort Lupton | — | ◐ LIKELY ACTIVE |
| CMClimax Molybdenum-henderson Mill | Parshall | — | ◇ UNVERIFIED |
| MCMetal Castings of Colorado INC. | Loveland | — | ◇ UNVERIFIED |
| WFWestern Foundries INC | Longmont | — | ◇ UNVERIFIED |
| BSBronze Services of Loveland, INC. | Loveland | 1–19 | ◐ LIKELY ACTIVE |
| ADAccu-Tube - Denver | Denver | 20–99 | ◐ LIKELY ACTIVE |
 Acme Manufacturing CO | Denver | 100–499 | ◐ LIKELY ACTIVE |
| CICastings, INC | Grand Junction | — | ◐ LIKELY ACTIVE |
| CSCF&I Steel LP dba Rocky Mountain Steel Mills | Pueblo | 500+ | ◐ LIKELY ACTIVE |
| JRJ.w. Reffel Metals Foundry INC | Englewood | — | ◐ LIKELY ACTIVE |
| RMRocky Mountain Steel INC. | Olathe | 20–99 | ◐ LIKELY ACTIVE |
| ZIZimkor Industries Incorporated | Littleton | — | ◐ LIKELY ACTIVE |
| ATAccu Tube Corporation | Englewood | — | ◇ UNVERIFIED |
 Acme Foundry INC | Denver | — | ◇ UNVERIFIED |
| AAAll Aluminum Recyclers INC | Colorado Springs | — | ◇ UNVERIFIED |
| ASAndersen's Sales & Salvage INC | Greeley | — | ◇ UNVERIFIED |
| AMAtlas Metal & Iron CORP | Denver | — | ◇ UNVERIFIED |
| AMAtlas Metals & Iron CORP Processing .cn | Denver | — | ◇ UNVERIFIED |
| CLChuck Lorentz | Montrose | — | ◇ UNVERIFIED |
| CSConsolidated Steel Svc | Englewood | — | ◇ UNVERIFIED |
| DWDavis Wire Pueblo CORP. | Pueblo | — | ◇ UNVERIFIED |
| DMDionisio Metal and Iron, INC. | Pueblo | — | ◇ UNVERIFIED |
| DRDomore Recycling | Denver | — | ◇ UNVERIFIED |
| ELElectron Littleton | Littleton | — | ◇ UNVERIFIED |
| FFFountain Foundry Dba F F Acquisition CO | Pueblo | — | ◇ UNVERIFIED |
| GFGenesis Fixtures Incorporated | Fort Collins | — | ◇ UNVERIFIED |
| GCGoltra Castings CO INC | Golden | — | ◇ UNVERIFIED |
| HGHydro Gate Acquisition Corporation | Commerce City | — | ◇ UNVERIFIED |
| IMInterstate Metals | Fort Morgan | — | ◇ UNVERIFIED |
| IMIron & Metals INC | Denver | — | ◇ UNVERIFIED |
| KCKloppenberg & CO | Sheridan | — | ◇ UNVERIFIED |
| MTMercury Tube - 3211 W Bear Creek Dr | Englewood | — | ◇ UNVERIFIED |
| MFMidwest Fabrication and Steel LLC | Pueblo | — | ◇ UNVERIFIED |
| MHMile Hi Metal Foundry | Denver | — | ◇ UNVERIFIED |
| MSMoreys Salvage & Glass | Windsor | — | ◇ UNVERIFIED |
