| FBFisher Barton Blades | Watertown | WI | Wood Product Manufacturing321999 | 100-499 | ◐ LIKELY ACTIVE |
| FBFisher Barton Specialties, Inc. | Watertown | WI | Fabricated Metal Product Manufacturing332116 | 20-99 | ◐ LIKELY ACTIVE |
| FFForemost Farms USA | Lancaster | WI | Food Manufacturing311510 | 20-99 | ◐ LIKELY ACTIVE |
| FFForemost Farms USA | Appleton | WI | Food Manufacturing311510 | 100-499 | ◐ LIKELY ACTIVE |
| FVFox Valley Metal-tech INC | Green Bay | WI | Fabricated Metal Product Manufacturing332117 | 100-499 | ◐ LIKELY ACTIVE |
| FTFrom the Forest LLC | Weston | WI | Wood Product Manufacturing321211 | 20-99 | ◐ LIKELY ACTIVE |
| FFFuture Foam, INC. | Middleton | WI | Plastics and Rubber Products Manufacturing326150 | 20-99 | ◐ LIKELY ACTIVE |
| GUGallina USA LLC | Janesville | WI | Plastics and Rubber Products Manufacturing326113 | 20-99 | ◐ LIKELY ACTIVE |
Garden-fresh Foods, INC. | Milwaukee | WI | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| GMGe Medical Systems LLC | Milwaukee | WI | Fabricated Metal Product Manufacturing332721 | — | ◐ LIKELY ACTIVE |
| GIGenco Industries, INC. | Waukesha | WI | Machinery Manufacturing333249 | 20-99 | ◐ LIKELY ACTIVE |
| GIGenencor International Wisconsin, INC. | Beloit | WI | Food Manufacturing311119 | 20-99 | ◐ LIKELY ACTIVE |
| GBGeorgia-pacific Broadway LLC | Green Bay | WI | Paper Manufacturing322120 | — | ◐ LIKELY ACTIVE |
| GCGetzen CO | Elkhorn | WI | Miscellaneous Manufacturing339990 | 20-99 | ◐ LIKELY ACTIVE |
| GIGilson INC | Middleton | WI | Computer and Electronic Product Manufacturing334516 | 100-499 | ◐ LIKELY ACTIVE |
| GPGlobal Power Components-51st St | Milwaukee | WI | Fabricated Metal Product Manufacturing332311 | 500+ | ◐ LIKELY ACTIVE |
| GAGordon Aluminum Industries | Schofield | WI | Primary Metal Manufacturing331316 | 100-499 | ◐ LIKELY ACTIVE |
| GCGpi CORP | Schofield | WI | Plastics and Rubber Products Manufacturing326100 | 1-19 | ◐ LIKELY ACTIVE |
| GMGraetz Mfg INC | Pound | WI | Fabricated Metal Product Manufacturing332320 | 20-99 | ◐ LIKELY ACTIVE |
Graphic House INC | Wausau | WI | Miscellaneous Manufacturing339950 | 20-99 | ◐ LIKELY ACTIVE |
| GLGreat Lakes Cheese of La Crosse, Wisconsin, INC. | La Crosse | WI | Food Manufacturing311513 | 100-499 | ◐ LIKELY ACTIVE |
| GLGreat Lakes Veneer, Inc. (formerly known as Marion Plywood Corporation) | Marion | WI | Wood Product Manufacturing321211 | 100-499 | ◐ LIKELY ACTIVE |
| GBGreen Bay Packaging INC - Mill Division | Green Bay | WI | Paper Manufacturing322121 | 100-499 | ◐ LIKELY ACTIVE |
Greg Evans Printing, INC. | Sparta | WI | Printing and Related Support Activities323111 | 20-99 | ◐ LIKELY ACTIVE |
| HLHallman Lindsay Quality Paints | Sun Prairie | WI | Chemical Manufacturing325510 | 100-499 | ◐ LIKELY ACTIVE |
| HAHandy Art INC | Milton | WI | Chemical Manufacturing325510 | 20-99 | ◐ LIKELY ACTIVE |
| HTHawk Trailers INC | Manawa | WI | Transportation Equipment Manufacturing336210 | 20-99 | ◐ LIKELY ACTIVE |
| HCHci Chemtec INC | Wausau | WI | Chemical Manufacturing325510 | 1-19 | ◐ LIKELY ACTIVE |
| HIHercules Incorporated - Milwaukee Plant | Milwaukee | WI | Chemical Manufacturing325211 | 20-99 | ◐ LIKELY ACTIVE |
| HIHighlight INC | Sparta | WI | Plastics and Rubber Products Manufacturing326100 | 20-99 | ◐ LIKELY ACTIVE |
Hi-standard Machining Co., INC. | Racine | WI | Fabricated Metal Product Manufacturing332710 | 1-19 | ◐ LIKELY ACTIVE |
| HMHorizon Manufacturing Group | Lake Mills | WI | Machinery Manufacturing333248 | 20-99 | ◐ LIKELY ACTIVE |
Hormel Foods Corporation Beloit Plant | Beloit | WI | Food Manufacturing311610 | — | ◐ LIKELY ACTIVE |
| HGHoward G Hinz CO INC | Franklin | WI | Fabricated Metal Product Manufacturing332700 | 20-99 | ◐ LIKELY ACTIVE |
| IIImperial Industries INC | Rothschild | WI | Fabricated Metal Product Manufacturing332420 | 100-499 | ◐ LIKELY ACTIVE |
| ILInland Label and Marketing Services, LLC - West Ave | La Crosse | WI | Printing and Related Support Activities323110 | 20-99 | ◐ LIKELY ACTIVE |
| IMInnovative Machining LLC | Neenah | WI | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| JCJbt Corporation | Grafton | WI | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| JDJ & D Tube Benders INC | Schofield | WI | Fabricated Metal Product Manufacturing332996 | 100-499 | ◐ LIKELY ACTIVE |
| JBJeneil Biotech INC | Saukville | WI | Food Manufacturing311000 | 100-499 | ◐ LIKELY ACTIVE |
| JTJohnson Truck Bodies | Rice Lake | WI | Transportation Equipment Manufacturing336200 | 100-499 | ◐ LIKELY ACTIVE |
| JIJoy-mark INC | Cudahy | WI | Nonmetallic Mineral Product Manufacturing327125 | 20-99 | ◐ LIKELY ACTIVE |
| JSJ.w. Speaker CORP | Germantown | WI | Transportation Equipment Manufacturing336320 | 100-499 | ◐ LIKELY ACTIVE |
| KTKaravan Trailers, INC | Fox Lake | WI | Fabricated Metal Product Manufacturing332999 | 100-499 | ◐ LIKELY ACTIVE |
| KIKees INC | Elkhart Lake | WI | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| KIKerry INC | Owen | WI | Food Manufacturing311510 | 100-499 | ◐ LIKELY ACTIVE |
| KIKerry Ingredients | Vesper | WI | Food Manufacturing311510 | — | ◐ LIKELY ACTIVE |
| KLKey Logo INC. | Hartford | WI | Printing and Related Support Activities323113 | 20-99 | ◐ LIKELY ACTIVE |
| KMKg Marketing & Bag CO | Waukesha | WI | Paper Manufacturing322220 | 20-99 | ◐ LIKELY ACTIVE |
| KMKickhaefer Manufacturing Company, LLC | Port Washington | WI | Fabricated Metal Product Manufacturing332116 | 100-499 | ◐ LIKELY ACTIVE |