| HMHawk's Mill Winery | Browntown, WI | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| HFHenry Farms Prairie Spirits | Dane, WI | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| HCHidden Cave Cidery | Middleton, WI | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| HGHop Garden Brewing | Belleville, WI | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| IPIdeal Pase, A Massman Company | Madison, WI | Machinery Manufacturing333993 | 20–99 | ◐ LIKELY ACTIVE |
| IFImaginary Factory | Madison, WI | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| IWIndigenous Wines and Ciders | Stoughton, WI | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| IBIsthmus Beverage Werks | Middleton, WI | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| IEIsthmus Engineering and Manufacturing | Madison, WI | Machinery Manufacturing333999 | 20–99 | ◐ LIKELY ACTIVE |
| JCJust Coffee Cooperative | Madison, WI | Food Manufacturing311920 | 20–99 | ◐ LIKELY ACTIVE |
| KMKelsch Machine Corporation | Belleville, WI | Fabricated Metal Product Manufacturing332710 | 20–99 | ◐ LIKELY ACTIVE |
| KCKlondike Cheese Co. | Monroe, WI | Food Manufacturing311513 | 100–499 | ◐ LIKELY ACTIVE |
| LGLacerta Group, LLC - 3000 Boeck Road | Portage, WI | Plastics and Rubber Products Manufacturing326112 | 20–99 | ◐ LIKELY ACTIVE |
La Crosse Sign Co. Inc. - Madison | Madison, WI | Miscellaneous Manufacturing339950 | 1–19 | ◐ LIKELY ACTIVE |
| LELokos Electronics, LLC | Middleton, WI | Computer and Electronic Product Manufacturing334413 | — | ◐ LIKELY ACTIVE |
| LLLuminex LMA | Madison, WI | Chemical Manufacturing325413 | 20–99 | ◐ LIKELY ACTIVE |
| LALW Allen LLC | Madison, WI | Computer and Electronic Product Manufacturing334513 | 20–99 | ◐ LIKELY ACTIVE |
| MMadison | Madison, WI | Chemical Manufacturing325414 | 500+ | ◐ LIKELY ACTIVE |
| MEMadison Electrolyte Blending Facility | Madison, WI | Electrical Equipment, Appliance & Component Manufacturing335910 | 1–19 | ◐ LIKELY ACTIVE |
| MFMadison Forms LLC | Mc Farland, WI | Printing and Related Support Activities323111 | 20–99 | ◐ LIKELY ACTIVE |
| MKMadison Kipp Corporation - North | Madison, WI | Primary Metal Manufacturing331523 | 20–99 | ◐ LIKELY ACTIVE |
| MKMadison Kipp Corporation South Plant/Corporate | Madison, WI | Primary Metal Manufacturing331523 | 20–99 | ◐ LIKELY ACTIVE |
| MLMad Local Food Group, LLC dba Pasture and Plenty | Madison, WI | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| MLMaple Leaf Cheesemakers, Inc. | Monroe, WI | Food Manufacturing311511 | 20–99 | ◐ LIKELY ACTIVE |
| MSMeat Science and Animal Biologics Discovery | Madison, WI | Food Manufacturing311611 | — | ◐ LIKELY ACTIVE |
| MCMershon's Cidery | Stoughton, WI | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| MMiddleton | Middleton, WI | Food Manufacturing311340 | 20–99 | ◐ LIKELY ACTIVE |
| MRMidwest Regional Processing LLC | Sun Prairie, WI | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| M6MilliporeSigma 601 | Madison, WI | Chemical Manufacturing325411 | 1–19 | ◐ LIKELY ACTIVE |
| M6MilliporeSigma 636 | Madison, WI | Chemical Manufacturing325411 | 20–99 | ◐ LIKELY ACTIVE |
| M6MilliporeSigma 645 | Madison, WI | Chemical Manufacturing325411 | 100–499 | ◐ LIKELY ACTIVE |
| MVMilliporeSigma VOA | Verona, WI | Chemical Manufacturing325411 | 100–499 | ◐ LIKELY ACTIVE |
| MCMinhas Craft Brewery | Monroe, WI | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| MMMinhas Micro Distillery | Monroe, WI | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| MMonroe | Monroe, WI | Printing and Related Support Activities323111 | 20–99 | ◐ LIKELY ACTIVE |
| MIMotibera, INC. | Madison, WI | Electrical Equipment, Appliance & Component Manufacturing335312 | — | ◐ LIKELY ACTIVE |
| MCMSNMP Contech Engineered Solutions LLC | Portage, WI | Fabricated Metal Product Manufacturing332322 | 1–19 | ◐ LIKELY ACTIVE |
| NSNatural Spirits LLC | Sun Prairie, WI | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| NGNelson Global Products, INC | Stoughton, WI | Transportation Equipment Manufacturing336390 | — | ◐ LIKELY ACTIVE |
| NPNmwi01-nmc-mpm - Poynette | Poynette, WI | Plastics and Rubber Products Manufacturing326199 | 1–19 | ◐ LIKELY ACTIVE |
| OMO&A Manufacturing | Brooklyn, WI | Machinery Manufacturing333514 | 20–99 | ◐ LIKELY ACTIVE |
| OMOa Manufacturing INC | Verona, WI | Machinery Manufacturing333514 | 20–99 | ◐ LIKELY ACTIVE |
| OFOdilon Ford Winery | Madison, WI | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| OTOneEvent Technologies, Inc. | Mount Horeb, WI | Computer and Electronic Product Manufacturing334290 | 1–19 | ◐ LIKELY ACTIVE |
| ODORBIS Deforest | De Forest, WI | Plastics and Rubber Products Manufacturing326199 | 20–99 | ◐ LIKELY ACTIVE |
| PWPardeeville, WI - A340 | Pardeeville, WI | Plastics and Rubber Products Manufacturing326140 | 20–99 | ◐ LIKELY ACTIVE |
| PPPCI Pharma Services - Madison | Madison, WI | Chemical Manufacturing325412 | 20–99 | ◐ LIKELY ACTIVE |
| Ppc/nametag | Verona, WI | Miscellaneous Manufacturing339940 | 20–99 | ◐ LIKELY ACTIVE |
| PCPlacon Corporation | Madison, WI | Plastics and Rubber Products Manufacturing326199 | 100–499 | ◐ LIKELY ACTIVE |
| PSPlain Spoke Cocktail Company | Sun Prairie, WI | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |