| LGLauterbach Group | Sussex | WI | Paper Manufacturing322222 | 20-99 | ◐ LIKELY ACTIVE |
| LPLeader Paper Products, INC. | Milwaukee | WI | Paper Manufacturing322230 | 20-99 | ◐ LIKELY ACTIVE |
| LILiphatech INC. | Milwaukee | WI | Chemical Manufacturing325320 | 20-99 | ◐ LIKELY ACTIVE |
| LMLippmann Milwaukee | Cudahy | WI | Machinery Manufacturing333120 | 20-99 | ◐ LIKELY ACTIVE |
| MTMahuta Tool Corp | Germantown | WI | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| MMMathison Manufacturing | Waukesha | WI | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| MIMCD, Inc. | Madison | WI | Paper Manufacturing322200 | 20-99 | ◐ LIKELY ACTIVE |
| MTMerrill Tool & Water Jet, LLC | Merrill | WI | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| MIMetalStorm, Inc. | DePere | WI | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| MFMid-City Foundry Co. - Milwaukee Division | Milwaukee | WI | Primary Metal Manufacturing331510 | 20-99 | ◐ LIKELY ACTIVE |
| MMMidwest Millwork & Casework LLC | La Crosse | WI | Furniture and Related Product Manufacturing337212 | 20-99 | ◐ LIKELY ACTIVE |
| MPMilwaukee Plating CO | Milwaukee | WI | Fabricated Metal Product Manufacturing332810 | 20-99 | ◐ LIKELY ACTIVE |
| MMMiro Mfg., INC | Waukesha | WI | Machinery Manufacturing333517 | 20-99 | ◐ LIKELY ACTIVE |
| MSMixer Systems INC | Pewaukee | WI | Machinery Manufacturing333120 | 20-99 | ◐ LIKELY ACTIVE |
| MBMolecular Biology Resources INC | Milwaukee | WI | Food Manufacturing311930 | 20-99 | ◐ LIKELY ACTIVE |
| MIMuthig Industries INC | Fond Du Lac | WI | Fabricated Metal Product Manufacturing332116 | 20-99 | ◐ LIKELY ACTIVE |
| NMNational Manufacturing Group - Franksville | Franksville | WI | Chemical Manufacturing325991 | 20-99 | ◐ LIKELY ACTIVE |
| NCNccm Company LLC | River Falls | WI | Textile Mills313230 | 20-99 | ◐ LIKELY ACTIVE |
| NCNekoosa Coated Products LLC | Nekoosa | WI | Paper Manufacturing322220 | 20-99 | ◐ LIKELY ACTIVE |
| NTNeosho Trompler Inc | Hartland | WI | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| NFNiagara Fabrication INC. | Niagara | WI | Fabricated Metal Product Manufacturing332313 | 20-99 | ◐ LIKELY ACTIVE |
| NINigrelli INC | Kiel | WI | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| NCNorth Country Lumber | Mellen | WI | Wood Product Manufacturing321113 | 20-99 | ◐ LIKELY ACTIVE |
| NCNorthern Crossarm INC | Chippewa Falls | WI | Wood Product Manufacturing321114 | 20-99 | ◐ LIKELY ACTIVE |
| NWNorth Wood Flooring | Coleman | WI | Wood Product Manufacturing321918 | 20-99 | ◐ LIKELY ACTIVE |
| PBPaper Box and Specialty Company | Sheboygan | WI | Paper Manufacturing322212 | 20-99 | ◐ LIKELY ACTIVE |
| PPPark Printing House LTD | Verona | WI | Printing and Related Support Activities323110 | 20-99 | ◐ LIKELY ACTIVE |
| PLPhilipp Lithographing CO | Grafton | WI | Printing and Related Support Activities323110 | 20-99 | ◐ LIKELY ACTIVE |
| PPPlastic Parts INC | Union Grove | WI | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
| PIPlastocon INC | Oconomowoc | WI | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
| PAPremier Aluminum INC | Racine | WI | Primary Metal Manufacturing331521 | 20-99 | ◐ LIKELY ACTIVE |
| PCPremold CORP | Oconomowoc | WI | Paper Manufacturing322223 | 20-99 | ◐ LIKELY ACTIVE |
| PCPrestige Custom Cabinetry and Millwork Inc | Green Bay | WI | Furniture and Related Product Manufacturing337110 | 20-99 | ◐ LIKELY ACTIVE |
| PEPro Ex Extrusion | Oshkosh | WI | Plastics and Rubber Products Manufacturing326112 | 20-99 | ◐ LIKELY ACTIVE |
| PProtect-all | Darien | WI | Plastics and Rubber Products Manufacturing326112 | 20-99 | ◐ LIKELY ACTIVE |
| RIRamrod Industries LLC | Spencer | WI | Machinery Manufacturing333995 | 20-99 | ◐ LIKELY ACTIVE |
| RMRenco Machine Co., INC. | Green Bay | WI | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| RIRetroflex INC | Wrightstown | WI | Paper Manufacturing322299 | 20-99 | ◐ LIKELY ACTIVE |
| RORock Oil Refining INC | Stratford | WI | Petroleum and Coal Products Manufacturing324110 | 20-99 | ◐ LIKELY ACTIVE |
| SCSaelens CORP | Johnson Creek | WI | Fabricated Metal Product Manufacturing332722 | 20-99 | ◐ LIKELY ACTIVE |
Saputo Cheese USA INC - Black Creek Div | Black Creek | WI | Food Manufacturing311513 | 20-99 | ◐ LIKELY ACTIVE |
| STSchaefer Tool and Manufacturing CO. INC. | Milwaukee | WI | Fabricated Metal Product Manufacturing332111 | 20-99 | ◐ LIKELY ACTIVE |
| SFSensient Flavors INC | Juneau | WI | Food Manufacturing311999 | 20-99 | ◐ LIKELY ACTIVE |
| SPSheboygan Paint CO. | Sheboygan | WI | Chemical Manufacturing325510 | 20-99 | ◐ LIKELY ACTIVE |
| SShurpac | Racine | WI | Wood Product Manufacturing321920 | 20-99 | ◐ LIKELY ACTIVE |
| SFSpirit Fabs INC | Wrightstown | WI | Fabricated Metal Product Manufacturing332310 | 20-99 | ◐ LIKELY ACTIVE |
| SCSt. Croix Castings, INC. | Woodville | WI | Primary Metal Manufacturing331524 | 20-99 | ◐ LIKELY ACTIVE |
| SCSt Croix Press INC | New Richmond | WI | Printing and Related Support Activities323110 | 20-99 | ◐ LIKELY ACTIVE |
| SKSteel King Industries INC | Stevens Point | WI | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| SISteelwind Industries | Oak Creek | WI | Chemical Manufacturing325510 | 20-99 | ◐ LIKELY ACTIVE |