 Argo Products Company | Saint Louis | 20–99 | ● ACTIVE |
 J. K. Pulley Company, INC. | Saint Louis | 20–99 | ● ACTIVE |
| FIFulton Iron and Manufacturing, L.l.c | Saint Louis | — | ● ACTIVE |
 H4 Manufacturing LLC | Saint Louis | — | ● ACTIVE |
 Paulo Products CO | Saint Louis | — | ● ACTIVE |
 Cardinal Auctions.com, INC. | Saint Louis | — | ● ACTIVE |
 Fedsource INC | Saint Louis | — | ● ACTIVE |
 Midwest Machining Solutions LLC | Saint Louis | — | ● ACTIVE |
 Troco, LLC | Saint Louis | — | ● ACTIVE |
| CFContinental Fabricators INC | Saint Louis | — | ◐ LIKELY ACTIVE |
| GMGmp Metal Products | Saint Louis | 20–99 | ◐ LIKELY ACTIVE |
| PMPrecoat Metals | Saint Louis | — | ◐ LIKELY ACTIVE |
| TITishler Industries INC | Saint Louis | 1–19 | ◐ LIKELY ACTIVE |
| CPCommercial Plating CO | Saint Louis | — | ◇ UNVERIFIED |
| HIHammerts Iron Works-hammerts Iron Works | Saint Louis | — | ◇ UNVERIFIED |
| ISIpc St Louis-ipc St Louis | Saint Louis | — | ◇ UNVERIFIED |
| EFEmpire Fence & Custom Iron Works INC | Saint Louis | — | ◐ LIKELY ACTIVE |
| ETElliot Tool INC | Saint Louis | 20–99 | ◐ LIKELY ACTIVE |
| HTHeat Transfer Systems, Inc. | Saint Louis | 1–19 | ◐ LIKELY ACTIVE |
| SSSouth Side Machine Works, Inc. | Saint Louis | 20–99 | ◐ LIKELY ACTIVE |
| KIKertz Ironworks INC | Saint Louis | — | ◐ LIKELY ACTIVE |
| APAmerican Plating Company | Saint Louis | — | ◇ UNVERIFIED |
| BTBodycote Thermal Processing | Saint Louis | — | ◇ UNVERIFIED |
| CSCashs Scrap Metal & Iron | Saint Louis | — | ◇ UNVERIFIED |
| CCClean City Squares INC | Saint Louis | — | ◇ UNVERIFIED |
| CICourion Industries | Saint Louis | — | ◇ UNVERIFIED |
| CBCrown Beverage Packaging | Saint Louis | — | ◇ UNVERIFIED |
| DDrumtech | Saint Louis | — | ◇ UNVERIFIED |
| FSFour Star Finishing CO INC | Saint Louis | — | ◇ UNVERIFIED |
| FSFour Star Finishing CO Inc-four Star Finishing CO INC | Saint Louis | — | ◇ UNVERIFIED |
| HAHomer A. Doerr & Sons Plating Company | Saint Louis | — | ◇ UNVERIFIED |
| HRH & R Plating Co-h & R Plating CO | Saint Louis | — | ◇ UNVERIFIED |
| JSJ S Alberici Construction | Saint Louis | — | ◇ UNVERIFIED |
| KMKeller Mfg-keller Mfg | Saint Louis | — | ◇ UNVERIFIED |
| KBKickham Boiler & Engineering | Saint Louis | — | ◇ UNVERIFIED |
 Lowell Manufacturing | Saint Louis | — | ◇ UNVERIFIED |
| MTMarquette Tool & Die | Saint Louis | — | ◇ UNVERIFIED |
| MSMerit Specialities-merit Specialities | Saint Louis | — | ◇ UNVERIFIED |
| MPMidwest Plating CO INC | Saint Louis | — | ◇ UNVERIFIED |
| MSModern Screw Products - Modern Screw Products | Saint Louis | — | ◇ UNVERIFIED |
| NCNooter Corp-nooter CORP | Saint Louis | — | ◇ UNVERIFIED |
| OSOtten Screw Products Co-otten Screw Products CO | Saint Louis | — | ◇ UNVERIFIED |
| RIRimco INC - Scrap Metal | Saint Louis | — | ◇ UNVERIFIED |
| SRSiegel Robert Plating-siegel Robert Plating | Saint Louis | — | ◇ UNVERIFIED |
| SLSt Louis (ex) Army Ammunition Plant | Saint Louis | — | ◇ UNVERIFIED |
| SLSt. Louis Metallizing Company | Saint Louis | — | ◇ UNVERIFIED |
| SLSt Louis Plating Company Inc-st Louis Plating Company INC | Saint Louis | — | ◇ UNVERIFIED |
| SMSwing-a-way Mfg-swing-a-way Mfg | Saint Louis | — | ◇ UNVERIFIED |
| TPTriangle Plating Co-triangle Plating CO | Saint Louis | — | ◇ UNVERIFIED |
| UBUnited Bumper Inc-united Bumper INC | Saint Louis | — | ◇ UNVERIFIED |
