| MPMenasha Packaging Company - PPS Neenah | Neenah | WI | Printing and Related Support Activities323111 | 100-499 | ◐ LIKELY ACTIVE |
| MWMenasha, WI - Paper - B280 | Menasha | WI | Paper Manufacturing322121 | 100-499 | ◐ LIKELY ACTIVE |
| MFMenomonee Falls Technical Center | Menomonee Falls | WI | Electrical Equipment, Appliance & Component Manufacturing335313 | 100-499 | ◐ LIKELY ACTIVE |
| MMenomonie (Oaklawn) | Menomonie | WI | Miscellaneous Manufacturing339112 | 100-499 | ◐ LIKELY ACTIVE |
| MMenomonie (Origen) | Menomonie | WI | Miscellaneous Manufacturing339112 | 100-499 | ◐ LIKELY ACTIVE |
| MCMenomonie (Red Cedar) | Menomonie | WI | Miscellaneous Manufacturing339112 | 100-499 | ◐ LIKELY ACTIVE |
| MWMenomonie WI | Menomonie | WI | Food Manufacturing311511 | 100-499 | ◐ LIKELY ACTIVE |
| MMMercury Marine Plant 36 (Racing) - Taycheedah, WI | Taycheedah | WI | Transportation Equipment Manufacturing336310 | 100-499 | ◐ LIKELY ACTIVE |
| MIMeritor Industrial Products - Oshkosh | Oshkosh | WI | Transportation Equipment Manufacturing336350 | 100-499 | ◐ LIKELY ACTIVE |
| MNMerz North America, Inc. Wisconsin | Sturtevant | WI | Miscellaneous Manufacturing339113 | 100-499 | ◐ LIKELY ACTIVE |
| MOMetalcraft of Mayville - West Bend | West Bend | WI | Machinery Manufacturing333112 | 100-499 | ◐ LIKELY ACTIVE |
Meyer Utility Structures | Hager City | WI | Primary Metal Manufacturing331210 | 100-499 | ◐ LIKELY ACTIVE |
| MGMGS Group North America, Inc. - MGS Germantown | Germantown | WI | Plastics and Rubber Products Manufacturing326199 | 100-499 | ◐ LIKELY ACTIVE |
| MMMGS Mfg. Group, Inc. - Tooling | Germantown | WI | Machinery Manufacturing333514 | 100-499 | ◐ LIKELY ACTIVE |
| M6MilliporeSigma 645 | Madison | WI | Chemical Manufacturing325411 | 100-499 | ◐ LIKELY ACTIVE |
| MVMilliporeSigma VOA | Verona | WI | Chemical Manufacturing325411 | 100-499 | ◐ LIKELY ACTIVE |
| MMilton | Milton | WI | Food Manufacturing311340 | 100-499 | ◐ LIKELY ACTIVE |
| MEMilwaukee Electronics | Glendale | WI | Machinery Manufacturing333242 | 100-499 | ◐ LIKELY ACTIVE |
| MPMilwaukee Plant | Milwaukee | WI | Food Manufacturing311611 | 100-499 | ◐ LIKELY ACTIVE |
Milwaukee Valve Company Inc. - Prairie du Sac | Prairie Du Sac | WI | Fabricated Metal Product Manufacturing332911 | 100-499 | ◐ LIKELY ACTIVE |
| MWMilwaukee, Wi | Milwaukee | WI | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
Modine Manufacturing - LB White Onalaska | Onalaska | WI | Machinery Manufacturing333414 | 100-499 | ◐ LIKELY ACTIVE |
| MEMSI Express - Rosendale | Rosendale | WI | Food Manufacturing311421 | 100-499 | ◐ LIKELY ACTIVE |
| MAMspdak Abc Truss Chetek | Chetek | WI | Wood Product Manufacturing321215 | 100-499 | ◐ LIKELY ACTIVE |
| MIMTI International Inc DBA VIRTEX | Menomonee Falls | WI | Computer and Electronic Product Manufacturing334418 | 100-499 | ◐ LIKELY ACTIVE |
| MOMukwonago Operations | Mukwonago | WI | Fabricated Metal Product Manufacturing332216 | 100-499 | ◐ LIKELY ACTIVE |
| MLMultistack, LLC | Sparta | WI | Machinery Manufacturing333415 | 100-499 | ◐ LIKELY ACTIVE |
| NCNeenah Converting Center | Neenah | WI | Machinery Manufacturing333243 | 100-499 | ◐ LIKELY ACTIVE |
| NCNeenah (Hayes)Tubes & Cores - C207 | Neenah | WI | Paper Manufacturing322299 | 100-499 | ◐ LIKELY ACTIVE |
| NINeenah Innovation Center | Neenah | WI | Plastics and Rubber Products Manufacturing326112 | 100-499 | ◐ LIKELY ACTIVE |
| NNekoosa | Nekoosa | WI | Paper Manufacturing322121 | 100-499 | ◐ LIKELY ACTIVE |
| NGNelson Global Products Viroqua | Viroqua | WI | Transportation Equipment Manufacturing336390 | 100-499 | ◐ LIKELY ACTIVE |
| NPNestle Pizza Manufacturing | Medford | WI | Food Manufacturing311412 | 100-499 | ◐ LIKELY ACTIVE |
| NPNestle Purina Pet Care - Jefferson | Jefferson | WI | Food Manufacturing311111 | 100-499 | ◐ LIKELY ACTIVE |
| NBNew Berlin - 16250 W Glendale Drive | New Berlin | WI | Electrical Equipment, Appliance & Component Manufacturing335314 | 100-499 | ◐ LIKELY ACTIVE |
| NBNiagara Bottling, LLC - Kenosha | Pleasant Prairie | WI | Beverage and Tobacco Product Manufacturing312112 | 100-499 | ◐ LIKELY ACTIVE |
| NMNicolet Mill | De Pere | WI | Paper Manufacturing322121 | 100-499 | ◐ LIKELY ACTIVE |
| NSNorlen - Schofield | Schofield | WI | Fabricated Metal Product Manufacturing332312 | 100-499 | ◐ LIKELY ACTIVE |
| NFNortera Foods Fairwater | Fairwater | WI | Food Manufacturing311411 | 100-499 | ◐ LIKELY ACTIVE |
| NENorthside Elevator Loyal | Loyal | WI | Food Manufacturing311119 | 100-499 | ◐ LIKELY ACTIVE |
| NPNosco - PIC | Pleasant Prairie | WI | Printing and Related Support Activities323111 | 100-499 | ◐ LIKELY ACTIVE |
| NUNovares US LLC | Prairie Du Chien | WI | Plastics and Rubber Products Manufacturing326199 | 100-499 | ◐ LIKELY ACTIVE |
| NWNovares Walworth 1 | Walworth | WI | Plastics and Rubber Products Manufacturing326199 | 100-499 | ◐ LIKELY ACTIVE |
| NWNovonesis - West Allis | West Allis | WI | Food Manufacturing311999 | 100-499 | ◐ LIKELY ACTIVE |
| OCOak Creek | Oak Creek | WI | Electrical Equipment, Appliance & Component Manufacturing335312 | 100-499 | ◐ LIKELY ACTIVE |
| OSOcean Spray Cranberries | Wisconsin Rapids | WI | Food Manufacturing311421 | 100-499 | ◐ LIKELY ACTIVE |
| OWOconomowoc Wi Bakery | Oconomowoc | WI | Food Manufacturing311812 | 100-499 | ◐ LIKELY ACTIVE |
| OSOh Snap! Pickling, LLC - Plant | Appleton | WI | Food Manufacturing311421 | 100-499 | ◐ LIKELY ACTIVE |
| OMOptima Machinery USA Corporation | Green Bay | WI | Machinery Manufacturing333993 | 100-499 | ◐ LIKELY ACTIVE |
| OIOrnua Ingredients LLC. | Hilbert | WI | Food Manufacturing311513 | 100-499 | ◐ LIKELY ACTIVE |