| SUStarting USA | Poplar Bluff | — | ◇ 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 |
| TITalbot Industries INC | Neosho | — | ◇ UNVERIFIED |
| TCTank Components Industries | Springfield | — | ◇ UNVERIFIED |
| TBTarsco Bolted Tank INC | Goodman | — | ◇ UNVERIFIED |
| TPTheiss Plating Corporation | Saint Louis | — | ◇ UNVERIFIED |
| TIThorco Industries | Lamar | — | ◇ UNVERIFIED |
| TOTracker Ozark | Ozark | — | ◇ UNVERIFIED |
| TPTriangle Plating Co-triangle Plating CO | Saint Louis | — | ◇ UNVERIFIED |
| TSTriumph Structures - Kansas City | Grandview | — | ◇ UNVERIFIED |
| TMTrue Mfg CO INC | Olivette | — | ◇ UNVERIFIED |
| TDTtt Dustless Blasting LLC | O Fallon | — | ◇ UNVERIFIED |
| UBUnited Bumper Inc-united Bumper INC | Saint Louis | — | ◇ UNVERIFIED |
| UGUniversal Galvinizing INC | Saint Peters | — | ◇ UNVERIFIED |
| URUnlimited Resources Corporation | Cairo | — | ◇ UNVERIFIED |
| UKUsdoe Kansas City National Security Campus | Kansas City | — | ◇ UNVERIFIED |
| UMUsona Metal Finishing LLC | Saint Louis | — | ◇ UNVERIFIED |
| WBW. B. Young Company | Marshall | — | ◇ UNVERIFIED |
| WCWear Concepts LLC | Liberty | — | ◇ UNVERIFIED |
| WOWestwood Ornamental Iron INC | Raytown | — | ◇ UNVERIFIED |
| WMWillerding Metal Fabrication INC | O Fallon | — | ◇ UNVERIFIED |
| WTWilson Tool & Die-st Charles | Saint Charles | — | ◇ UNVERIFIED |
| WRWorldwide Recycling Equipment Sales LLC | Moberly | — | ◇ UNVERIFIED |
| ZMZerco Mfg | Springfield | — | ◇ UNVERIFIED |
| 5N5700 NW 39th Street, Riverside, MO 64150 | Riverside | 20–99 | ◐ LIKELY ACTIVE |
| ASABB - St Louis | Saint Louis | 100–499 | ◐ LIKELY ACTIVE |
| AIAlpha-omega Industries, INC. | Harrisonville | — | ◐ LIKELY ACTIVE |
| AIAmerican Industrial Company, LLC | Belton | — | ◐ LIKELY ACTIVE |
| AFAntonia Fabricators, Inc | Imperial | 20–99 | ◐ LIKELY ACTIVE |
| ACArning Companies Cassville | Cassville | 100–499 | ◐ LIKELY ACTIVE |
| ASAssociated Sheet Metal | Jackson | 20–99 | ◐ LIKELY ACTIVE |
| ASAward Specialties LLC | Kimmswick | — | ◐ LIKELY ACTIVE |
| AZA. Zahner Co (Kansas City & field sites) | Kansas City | 100–499 | ◐ LIKELY ACTIVE |
| AGAZZ Galvanizing St. Louis | Saint Louis | 20–99 | ◐ LIKELY ACTIVE |
| BPBaer Precision, INC | Fenton | — | ◐ LIKELY ACTIVE |
| BBBBNA Butler - Grandview, MO | Grandview | 20–99 | ◐ LIKELY ACTIVE |
| BBBluescope Buildings North America, INC. | Kansas City | — | ◐ LIKELY ACTIVE |
 BlueScope Construction - Kansas City, MO | Kansas City | 1–19 | ◐ LIKELY ACTIVE |
| BABohn and Dawson, Incorporated | Saint Louis | — | ◐ LIKELY ACTIVE |
| BEBountiful Enterprises | Humansville | 20–99 | ◐ LIKELY ACTIVE |
| BABoyd Aluminum | Springfield | 20–99 | ◐ LIKELY ACTIVE |
| BCBrandnew Chair CO LLC | Troy | — | ◐ LIKELY ACTIVE |
| BMBtm Manufacturing | Kansas City | 20–99 | ◐ LIKELY ACTIVE |
| BMBuchheit Metals | Advance | 1–19 | ◐ LIKELY ACTIVE |
| CACFS a division of Michels Pipeline Inc | Carrolton | 20–99 | ◐ LIKELY ACTIVE |
| CPCMC Plant 1 | Springfield | 20–99 | ◐ LIKELY ACTIVE |
| CPCMC Plant 2 | Springfield | 20–99 | ◐ LIKELY ACTIVE |
