 Precision Components & Assemblies, INC | Saint Peters | 1–19 | ● ACTIVE |
 Seyer Industries, INC. | Saint Peters | — | ● ACTIVE |
 Willerding Acquisition CORP. | O Fallon | — | ● ACTIVE |
 Austin Machine CO | O Fallon | — | ● ACTIVE |
 National Cart CO INC | Saint Charles | — | ● ACTIVE |
 Planet Tool & Gear INC | O Fallon | — | ● ACTIVE |
 Clyde Joseph Enterprises, LLC | Wentzville | — | ● ACTIVE |
 Promd Care Management LLC | Wentzville | — | ● ACTIVE |
 Sheds Direct Stores, LLC | Weldon Spring | — | ● ACTIVE |
| MPModineer Plant 7 | Saint Peters | 100–499 | ◐ LIKELY ACTIVE |
| LTLivingston Tool & Mfg. CO. | O Fallon | — | ◐ LIKELY ACTIVE |
| NENatoli Engineering | Saint Charles | — | ◐ LIKELY ACTIVE |
| NCNorth Central Stamping, Inc. | O Fallon | 20–99 | ◐ LIKELY ACTIVE |
| ASA Square Systems INC | O Fallon | — | ◐ LIKELY ACTIVE |
| AAvmat | O Fallon | — | ◐ LIKELY ACTIVE |
| BBlastco | Wentzville | — | ◐ LIKELY ACTIVE |
| CRCmc Rebar - St. Louis | O Fallon | — | ◇ UNVERIFIED |
| CBComponent Bar Products Inc-st Charles | Saint Charles | — | ◇ UNVERIFIED |
| CSCorpair Supply CO | O Fallon | — | ◇ UNVERIFIED |
| CICraftsmen Industries Inc-clay St Plant | Saint Charles | — | ◇ UNVERIFIED |
| GSGoeke Sandblasting | Saint Charles | — | ◇ UNVERIFIED |
| LMLeonards Metal INC - Mueller Road Plant | Saint Charles | — | ◇ UNVERIFIED |
| MMMarmic Metal Treating | Saint Charles | — | ◇ UNVERIFIED |
| RERustique Enterprises INC | O Fallon | — | ◇ UNVERIFIED |
| TDTtt Dustless Blasting LLC | O Fallon | — | ◇ UNVERIFIED |
| UGUniversal Galvinizing INC | Saint Peters | — | ◇ UNVERIFIED |
| WMWillerding Metal Fabrication INC | O Fallon | — | ◇ UNVERIFIED |
| WTWilson Tool & Die-st Charles | Saint Charles | — | ◇ UNVERIFIED |
| Planet Tool & Gear Inc | O Fallon | 20–99 | ◐ LIKELY ACTIVE |
| QLQuintel Logistics & Distributions LLC | Wentzville | — | ◐ LIKELY ACTIVE |
| SISeyer Industries | Saint Peters | 100–499 | ◐ LIKELY ACTIVE |
| AEAdvance Engineering and Manufacturing Company | O Fallon | — | ◇ UNVERIFIED |
| CICateck, INC. | Saint Peters | — | ◇ UNVERIFIED |
| DCDubois Chemicals Wentzville | Wentzville | — | ◇ UNVERIFIED |
| EGEisen Group | Saint Charles | — | ◇ UNVERIFIED |
| EGEisen Group Panel System | Saint Charles | — | ◇ UNVERIFIED |
| EIEverwear, INC. | Lake Saint Louis | — | ◇ UNVERIFIED |
| GGerdau | O Fallon | — | ◇ UNVERIFIED |
| JHJNTL Holdings LLC | O Fallon | — | ◇ UNVERIFIED |
| MSMetalflex Sales, Inc. | Saint Charles | — | ◇ UNVERIFIED |
| MUMitek USA INC | Saint Charles | — | ◇ UNVERIFIED |
| PAPhoenix / Anjon Building Materials, Inc. | O'Fallon | — | ◇ UNVERIFIED |
| PMPhoenix Metals Company | O Fallon | — | ◇ UNVERIFIED |
| RFReliable Fab and Manufacturing INC. | O Fallon | — | ◇ UNVERIFIED |
| SCSaint Charles Tool & Die | Saint Charles | — | ◇ UNVERIFIED |
| SPSerbin Precision Machining LLC | Saint Peters | — | ◇ UNVERIFIED |
| SESharp Erectors LLC | Wentzville | — | ◇ UNVERIFIED |
| SMS. M. F., Inc. | O'Fallon | — | ◇ UNVERIFIED |
| WMWill-share Manufacturing, INC. | Saint Peters | — | ◇ UNVERIFIED |
