| OFOem Fabricators INC | Neillsville | — | ◇ UNVERIFIED |
| OPOshkosh Plating Technologies INC | Oshkosh | — | ◇ UNVERIFIED |
| PIPacal Industries LLC | La Crosse | — | ◇ UNVERIFIED |
| PHParker Hannifin CORP Refrigerating Specialties Di | Mauston | — | ◇ UNVERIFIED |
| PHP & H Mining Equipment | Milwaukee | — | ◇ UNVERIFIED |
| PCPhoenix Coaters LLC | Berlin | — | ◇ UNVERIFIED |
| PFPjk Finishing CO INC | Menomonee Falls | — | ◇ UNVERIFIED |
| PEPlating Engineering | Milwaukee | — | ◇ UNVERIFIED |
| PSPoblocki & Sons INC | West Allis | — | ◇ UNVERIFIED |
| PWPolar Ware CO | Sheboygan | — | ◇ UNVERIFIED |
| PSPressed Steel Tank CO INC | Milwaukee | — | ◇ UNVERIFIED |
| PFProfile Finishing Systems INC | Waukesha | — | ◇ UNVERIFIED |
| RWRegal Ware INC - Kewaskum | Kewaskum | — | ◇ UNVERIFIED |
| RPReliable Plating Works-5th St | Milwaukee | — | ◇ UNVERIFIED |
 Rie Coatings LLC | Oshkosh | — | ◇ UNVERIFIED |
| RTRipon Truck Repair & Equipment, LLC | Pickett | — | ◇ UNVERIFIED |
| RCRytec CORP | Jackson | — | ◇ UNVERIFIED |
| SMScan-pac Manufacturing INC | Menomonee Falls | — | ◇ UNVERIFIED |
| SIScot Industries | Muscoda | — | ◇ UNVERIFIED |
| SIShanti Ind INC | Monticello | — | ◇ UNVERIFIED |
| SLSic Lazaro US INC | Milwaukee | — | ◇ UNVERIFIED |
| SCSilgan Containers Manufacturing CORP | Kenosha | — | ◇ UNVERIFIED |
| SCSilgan Containers Manufacturing Corporat | Waupun | — | ◇ UNVERIFIED |
| SCSilgan Containers Mfg CORP | Oconomowoc | — | ◇ UNVERIFIED |
| SKS K Williams CO | Milwaukee | — | ◇ UNVERIFIED |
| SISkycoat Industrial Armor | Baldwin | — | ◇ UNVERIFIED |
 Sonoco Products CO | Wausau | — | ◇ UNVERIFIED |
| SMSouthwest Metal Finishing - Calhoun Rd Plt | New Berlin | — | ◇ UNVERIFIED |
| SASpectrum Aluminum Finishing | Muskego | — | ◇ UNVERIFIED |
| SFSpx Flow US LLC | Delavan | — | ◇ UNVERIFIED |
| SLSpx Lindberg a Division of Spx Corporation | Watertown | — | ◇ UNVERIFIED |
| STSsi Technologies INC (former) | Janesville | — | ◇ UNVERIFIED |
| SNStabio North America | Trevor | — | ◇ UNVERIFIED |
 Steele Solutions INC | South Milwaukee | — | ◇ UNVERIFIED |
| SISuperior Industrial Coating INC | Racine | — | ◇ UNVERIFIED |
| SSSuper Steel LLC | Milwaukee | — | ◇ UNVERIFIED |
| SSSuper Steel Products CORP | Milwaukee | — | ◇ UNVERIFIED |
| SCSupreme Cores, Incorporated | Milwaukee | — | ◇ UNVERIFIED |
| SZSussex Zinc Plating INC | Sussex | — | ◇ UNVERIFIED |
| SISymet INC | Milwaukee | — | ◇ UNVERIFIED |
| TCTankcraft CORP | Walworth | — | ◇ UNVERIFIED |
| TITecomet INC | Kenosha | — | ◇ UNVERIFIED |
| TGTed Grob Corporation | Grafton | — | ◇ UNVERIFIED |
| TITenneco INC. | Waupun | — | ◇ UNVERIFIED |
| TGTextron Gse - Premier | Marinette | — | ◇ UNVERIFIED |
| TMThe Metal Ware Corporation | Two Rivers | — | ◇ UNVERIFIED |
| TSThermal Spray Technologies INC | Sun Prairie | — | ◇ UNVERIFIED |
| TMTramont Manufacturing LLC | Milwaukee | — | ◇ UNVERIFIED |
| TMTramont Manufacturing LLC | Milwaukee | — | ◇ UNVERIFIED |
| TCTri Clover INC | Kenosha | — | ◇ UNVERIFIED |
