| APAmerican Packaging Corporation - Columbus | Columbus | WI | Printing and Related Support Activities323111 | 100-499 | ◐ LIKELY ACTIVE |
| ABAmrize Building Envelope LLC | Deforest | WI | Plastics and Rubber Products Manufacturing326150 | — | ◐ LIKELY ACTIVE |
| AMAMS Micromedical | Sparta | WI | Miscellaneous Manufacturing339114 | 20-99 | ◐ LIKELY ACTIVE |
| AMAndersen Menomonie INC | Menomonie | WI | Wood Product Manufacturing321911 | 100-499 | ◐ LIKELY ACTIVE |
| ACAnderson Custom Processing | Belleville | WI | Food Manufacturing311221 | 20-99 | ◐ LIKELY ACTIVE |
Angi Energy Systems, LLC | Janesville | WI | Machinery Manufacturing333298 | — | ◐ LIKELY ACTIVE |
| ASApache Stainless Equip CORP Industrial Dr | Beaver Dam | WI | Fabricated Metal Product Manufacturing332000 | — | ◐ LIKELY ACTIVE |
| AHApi Heat Transfer | Iron Ridge | WI | Fabricated Metal Product Manufacturing332310 | 1-19 | ◐ LIKELY ACTIVE |
| ATApollo Tool, INC | Westfield | WI | Machinery Manufacturing333511 | 20-99 | ◐ LIKELY ACTIVE |
| AEAppleton Electric LLC | South Milwaukee | WI | Primary Metal Manufacturing331510 | — | ◐ LIKELY ACTIVE |
| AMApplied Material Solutions, INC. | Elkhorn | WI | Chemical Manufacturing325180 | 100-499 | ◐ LIKELY ACTIVE |
| AWAp Westshore | Oshkosh | WI | Fabricated Metal Product Manufacturing332811 | 20-99 | ◐ LIKELY ACTIVE |
| AGArdagh Glass INC. (burlington) | Burlington | WI | Nonmetallic Mineral Product Manufacturing327210 | — | ◐ LIKELY ACTIVE |
| AIArgo Industries Inc | Brookfield | WI | Fabricated Metal Product Manufacturing332313 | 20-99 | ◐ LIKELY ACTIVE |
| AFAshley Furniture Industries INC | Arcadia | WI | Furniture and Related Product Manufacturing337120 | 500+ | ◐ LIKELY ACTIVE |
| ADASI Doors, Inc. | Milwaukee | WI | Fabricated Metal Product Manufacturing332321 | 20-99 | ◐ LIKELY ACTIVE |
Associated Milk Producers Jim Falls Div | Jim Falls | WI | Food Manufacturing311510 | — | ◐ LIKELY ACTIVE |
| ABAstec Burlington | Burlington | WI | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◐ LIKELY ACTIVE |
Astro Industries INC | Green Bay | WI | Fabricated Metal Product Manufacturing332810 | 20-99 | ◐ LIKELY ACTIVE |
| AFAti Forged Products | Appleton | WI | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| AMAtlas Molded Products a Division of Atlas Roofing CORP | Fond Du Lac | WI | Plastics and Rubber Products Manufacturing326140 | 20-99 | ◐ LIKELY ACTIVE |
| ATAtlas Tag and Label | Neenah | WI | Paper Manufacturing322290 | 20-99 | ◐ LIKELY ACTIVE |
| APAvid Pallet Recycling, LLC. | Beloit | WI | Wood Product Manufacturing321920 | 20-99 | ◐ LIKELY ACTIVE |
| ALAyersTech LLC | Chetek | WI | Fabricated Metal Product Manufacturing332710 | 1-19 | ◐ LIKELY ACTIVE |
| BPBadger Plug Company | Greenville | WI | Wood Product Manufacturing321999 | 20-99 | ◐ LIKELY ACTIVE |
| BSBadger Sheet Metal Works | Green Bay | WI | Fabricated Metal Product Manufacturing332322 | 100-499 | ◐ LIKELY ACTIVE |
| BCBall Container LLC | Fort Atkinson | WI | Fabricated Metal Product Manufacturing332430 | — | ◐ LIKELY ACTIVE |
Barker's Welding, INC. | Superior | WI | Fabricated Metal Product Manufacturing332312 | 1-19 | ◐ LIKELY ACTIVE |
| BEBarr Enterprises, INC. | Greenwood | WI | Food Manufacturing311111 | 1-19 | ◐ LIKELY ACTIVE |
| BBBci Burke Company, LLC | North Fond Du Lac | WI | Miscellaneous Manufacturing339920 | — | ◐ LIKELY ACTIVE |
| BHBeaver Holdings INC Dba Shell Lake Woodcrafters | Shell Lake | WI | Furniture and Related Product Manufacturing337122 | 20-99 | ◐ LIKELY ACTIVE |
| BCBelgioioso Cheese | Denmark | WI | Food Manufacturing311513 | 100-499 | ◐ LIKELY ACTIVE |
| BLBell Laboratories INC | Windsor | WI | Chemical Manufacturing325320 | 500+ | ◐ LIKELY ACTIVE |
| BIBelmark INC Plants 1 And2 | Depere | WI | Printing and Related Support Activities323110 | — | ◐ LIKELY ACTIVE |
| BWBemis Wisconsin Llc-appleton | Appleton | WI | Paper Manufacturing322221 | — | ◐ LIKELY ACTIVE |
| BEBlaschko Enterprises, Inc | Arcadia | WI | Printing and Related Support Activities323111 | 20-99 | ◐ LIKELY ACTIVE |
| BIBorg Indak, Inc. | Delavan | WI | Computer and Electronic Product Manufacturing334418 | 20-99 | ◐ LIKELY ACTIVE |
| BIBpm INC | Peshtigo | WI | Paper Manufacturing322120 | 20-99 | ◐ LIKELY ACTIVE |
| BLBranches LLC | Osceola | WI | Wood Product Manufacturing321999 | 20-99 | ◐ LIKELY ACTIVE |
| BGBrenntag Great Lakes, Llc-distribution | Menomonee Falls | WI | Chemical Manufacturing325998 | — | ◐ LIKELY ACTIVE |
| BMBreuer Metal Craftsmen | Beaver Dam | WI | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| BPBryant Products, INC. | Ixonia | WI | Machinery Manufacturing333922 | 20-99 | ◐ LIKELY ACTIVE |
| BNBurgess Norton Mfg CO Plant #4 | Beaver Dam | WI | Fabricated Metal Product Manufacturing332117 | 20-99 | ◐ LIKELY ACTIVE |
| BBBush Brothers & CO INC | Augusta | WI | Food Manufacturing311420 | 100-499 | ◐ LIKELY ACTIVE |
| BPBw Papersystems | Phillips | WI | Fabricated Metal Product Manufacturing332710 | 500+ | ◐ LIKELY ACTIVE |
| CCCabinet Creations and Design INC | Luxemburg | WI | Furniture and Related Product Manufacturing337110 | 20-99 | ◐ LIKELY ACTIVE |
| CGCarboline Global INC. | Green Bay | WI | Chemical Manufacturing325510 | — | ◐ LIKELY ACTIVE |
| CFCardinal Fg | Portage | WI | Nonmetallic Mineral Product Manufacturing327210 | — | ◐ LIKELY ACTIVE |
| CGCardinal Glass | Tomah | WI | Nonmetallic Mineral Product Manufacturing327215 | 100-499 | ◐ LIKELY ACTIVE |
| CCCarfair Composites USA INC | Gillett | WI | Plastics and Rubber Products Manufacturing326120 | — | ◐ LIKELY ACTIVE |