| RIRoyster-clark Incorporated | Madison, WI | Chemical Manufacturing325310 | — | ◇ UNVERIFIED |
| RDRr Donnelley | Monroe, WI | Paper Manufacturing322222 | — | ◇ UNVERIFIED |
| SSSaint-gobain Sgppl | Portage, WI | Chemical Manufacturing325212 | — | ◇ UNVERIFIED |
| SISchoessow INC | Portage, WI | Machinery Manufacturing333110 | — | ◇ UNVERIFIED |
| SIShanti Ind INC | Monticello, WI | Fabricated Metal Product Manufacturing332610 | — | ◇ UNVERIFIED |
| SSSierra Space | Middleton, WI | Transportation Equipment Manufacturing336415 | — | ◇ UNVERIFIED |
| SSta-care | Pardeeville, WI | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| SCStratatech CORP | Madison, WI | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| SFSub-zero Freezer CO INC | Madison, WI | Electrical Equipment, Appliance & Component Manufacturing335200 | — | ◇ UNVERIFIED |
| SZSub Zero/wolf | Fitchburg, WI | Electrical Equipment, Appliance & Component Manufacturing335220 | — | ◇ UNVERIFIED |
| SWSynergy Web Graphics | Mazomanie, WI | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| TTechline | Waunakee, WI | Wood Product Manufacturing321219 | — | ◇ UNVERIFIED |
| TAThe Andersons INC. | Arena, WI | Chemical Manufacturing325314 | — | ◇ UNVERIFIED |
| TCThe Carlson CO | Madison, WI | Wood Product Manufacturing321918 | — | ◇ UNVERIFIED |
| TSThermal Spray Technologies INC | Sun Prairie, WI | Fabricated Metal Product Manufacturing332800 | — | ◇ UNVERIFIED |
| TEThermo Electron CORP. | Madison, WI | Computer and Electronic Product Manufacturing334510 | — | ◇ UNVERIFIED |
| VPVita Plus Madison Production | Madison, WI | Food Manufacturing311119 | — | ◇ UNVERIFIED |
| WPWausau Paper | Columbus, WI | Paper Manufacturing322220 | — | ◇ UNVERIFIED |
| WIWebcrafters, INC. | Madison, WI | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| WSWeir Slurry Group, INC | Madison, WI | Machinery Manufacturing333910 | — | ◇ UNVERIFIED |
| WRWingra Redi-mix INC Plant 1&2 | Fitchburg, WI | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| WBWisconsin Built INC | Deerfield, WI | Furniture and Related Product Manufacturing337212 | — | ◇ UNVERIFIED |
| WCWisconsin Cheese Group | Monticello, WI | Food Manufacturing311513 | — | ◇ UNVERIFIED |
| WFWisconsin Finishes | Verona, WI | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| WPWisconsin Porcelain | Sun Prairie, WI | Nonmetallic Mineral Product Manufacturing327110 | — | ◇ UNVERIFIED |
| WCWoodbridge CORP | Brodhead, WI | Plastics and Rubber Products Manufacturing326150 | — | ◇ UNVERIFIED |
| A1Accuray 1240 | Madison, WI | Computer and Electronic Product Manufacturing334517 | 100–499 | ◐ LIKELY ACTIVE |
| ABAccuray Badger Rd | Madison, WI | Computer and Electronic Product Manufacturing334517 | 20–99 | ◐ LIKELY ACTIVE |
| ANActus Nutrition - Monroe | Monroe, WI | Food Manufacturing311514 | 20–99 | ◐ LIKELY ACTIVE |
| AAlkar | Lodi, WI | Machinery Manufacturing333241 | 100–499 | ◐ LIKELY ACTIVE |
| AOAlpha Omega LLC | Madison, WI | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| ABALT Brew | Madison, WI | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| AFAmcor Flexibles Madison | Madison, WI | Plastics and Rubber Products Manufacturing326112 | 100–499 | ◐ LIKELY ACTIVE |
| AWAmerican Wine Project, LLC | Mineral Point, WI | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| ATAnimolecule Technologies LLC | Madison, WI | Computer and Electronic Product Manufacturing334516 | — | ◐ LIKELY ACTIVE |
| ADApex Dental Laboratory of Madison | Madison, WI | Miscellaneous Manufacturing339116 | 1–19 | ◐ LIKELY ACTIVE |
| AMArgon Medical Devices Inc. Portage, WI | Portage, WI | Machinery Manufacturing333514 | 1–19 | ◐ LIKELY ACTIVE |
| APArrowhead Pharmaceuticals - Madison | Madison, WI | Chemical Manufacturing325412 | 100–499 | ◐ LIKELY ACTIVE |
| ABAsahi Beer U.s.a., INC. | Waunakee, WI | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| APAstro Pak LLC - Wisconsin | Middletion, WI | Fabricated Metal Product Manufacturing332813 | 1–19 | ◐ LIKELY ACTIVE |
| AFAtmus Filtration Technologies Inc | Stoughton, WI | Transportation Equipment Manufacturing336390 | 20–99 | ◐ LIKELY ACTIVE |
| ADAvid Drinkers LLC | Madison, WI | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| ADAwildan Distilling LLC | Sun Prairie, WI | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| BBCS-Waunakee | Waunakee, WI | Printing and Related Support Activities323111 | 20–99 | ◐ LIKELY ACTIVE |
| BLBevy LLC | Wisconsin Dells, WI | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BFB&G Foods | Stoughton, WI | Food Manufacturing311422 | 20–99 | ◐ LIKELY ACTIVE |
| BRBlack Rose Blending Company | Madison, WI | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BVBotham Vineyards | Barneveld, WI | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BCBrix Cider LLC | Mount Horeb, WI | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| BBBruno Beef Strips | Monroe, WI | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |