| PAPermalok - a Northwest Pipe CO | Saint Louis | 1–19 | ◐ LIKELY ACTIVE |
 Lawrence Fabric Structures INC | Saint Louis | 20–99 | ◐ LIKELY ACTIVE |
| NPNestle Purina Support Center | Saint Louis | 20–99 | ◐ LIKELY ACTIVE |
| PMPrecoat Metals | Saint Louis | — | ◐ LIKELY ACTIVE |
| HIHammerts Iron Works-hammerts Iron Works | Saint Louis | — | ◇ UNVERIFIED |
| ISIpc St Louis-ipc St Louis | Saint Louis | — | ◇ UNVERIFIED |
| MMMissouri Metals - Division of Samuel Son & CO USA INC | Saint Louis | — | ◇ UNVERIFIED |
| EFEmpire Fence & Custom Iron Works INC | Saint Louis | — | ◐ LIKELY ACTIVE |
| ECEssex Cryogencies of Missouri | Saint Louis | — | ◐ LIKELY ACTIVE |
| ISInventory Sales CO | Saint Louis | — | ◐ LIKELY ACTIVE |
| SSSouth Side Machine Works, Inc. | Saint Louis | 20–99 | ◐ LIKELY ACTIVE |
| WMWilson Manufacturing Company | Saint Louis | 100–499 | ◐ LIKELY ACTIVE |
| AMAbb Motors and Mechanical INC | Saint Louis | — | ◐ LIKELY ACTIVE |
| CPCrest Plating | Saint Louis | — | ◐ LIKELY ACTIVE |
| TBThomas & Betts Americal Electric | Saint Louis | — | ◐ LIKELY ACTIVE |
| ACAetna Coatings INC | Saint Louis | — | ◇ UNVERIFIED |
| APAmerican Plating Company | Saint Louis | — | ◇ UNVERIFIED |
| AMArchitectural Metals INC | Saint Louis | — | ◇ UNVERIFIED |
| CSCgb St Louis Shipyard | Saint Louis | — | ◇ UNVERIFIED |
| CFCustom Fabrications & Coatings | Saint Louis | — | ◇ UNVERIFIED |
| DDDawson Dodd Heating & Cooling | Saint Louis | — | ◇ UNVERIFIED |
| DDrumtech | Saint Louis | — | ◇ UNVERIFIED |
| EAEngineered Air Systems Inc-price | Saint Louis | — | ◇ UNVERIFIED |
| FSFour Star Finishing CO Inc-four Star Finishing CO INC | Saint Louis | — | ◇ UNVERIFIED |
| GCGateway Company-graham | 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 |
| KBKupferer Brothers-st Louis | Saint Louis | — | ◇ UNVERIFIED |
| MTMarquette Tool & Die | Saint Louis | — | ◇ UNVERIFIED |
| MSMerit Specialities-merit Specialities | 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 |
| 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 |
| UMUsona Metal Finishing LLC | Saint Louis | — | ◇ UNVERIFIED |
| AGAZZ Galvanizing St. Louis | Saint Louis | 20–99 | ◐ LIKELY ACTIVE |
| DDavlan | Saint Louis | 20–99 | ◐ LIKELY ACTIVE |
| DMDuke Manufacturing Company - St. Louis | Saint Louis | 100–499 | ◐ LIKELY ACTIVE |
| FIFulton Iron & Manufacturing LLC | Saint Louis | 20–99 | ◐ LIKELY ACTIVE |
| HCHager Companies - St. Louis | Saint Louis | 100–499 | ◐ LIKELY ACTIVE |
| HFHillsdale Fabricators | Saint Louis | 100–499 | ◐ LIKELY ACTIVE |
