| PSPressed Steel Tank CO INC | Milwaukee | WI | Fabricated Metal Product Manufacturing332420 | — | ◇ UNVERIFIED |
| PMPrestige Milk Proteins, LLC | Arpin | WI | Food Manufacturing311510 | — | ◇ UNVERIFIED |
| PPPresto Prods. CO. | Weyauwega | WI | Paper Manufacturing322223 | — | ◇ UNVERIFIED |
| PDPrinting Developments INC | Racine | WI | Chemical Manufacturing325000 | — | ◇ UNVERIFIED |
| PProampac | Neenah | WI | Paper Manufacturing322220 | — | ◇ UNVERIFIED |
| PPProduce Processors, LLC | Plover | WI | Food Manufacturing311111 | 20-99 | ◇ UNVERIFIED |
| PXProfile Xtrusions LLC | Neenah | WI | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◇ UNVERIFIED |
| PCPromega CORP - Biopharmaceutical Tech Ctr | Madison | WI | Chemical Manufacturing325413 | — | ◇ UNVERIFIED |
| PIPxl INC | Ladysmith | WI | Computer and Electronic Product Manufacturing334419 | — | ◇ UNVERIFIED |
| RSRacine Steel Castings Div | Racine | WI | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| RDRapid Die & Molding CO INC Amelia St Plt | Cassville | WI | Paper Manufacturing322220 | — | ◇ UNVERIFIED |
| RCRayovac CORP Madison | Madison | WI | Electrical Equipment, Appliance & Component Manufacturing335910 | — | ◇ UNVERIFIED |
| RFReady Fixtures | Shell Lake | WI | Furniture and Related Product Manufacturing337125 | — | ◇ UNVERIFIED |
| RAReal Alloy Recycling INC - Racine Plant | Mount Pleasant | WI | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| RRReclaimed Rustic Woodworks, INC. | Phillips | WI | Furniture and Related Product Manufacturing337122 | 1-19 | ◇ UNVERIFIED |
| RRRegal Rexnord - Black River Falls | Black River Falls | WI | Electrical Equipment, Appliance & Component Manufacturing335312 | — | ◇ UNVERIFIED |
| RPReliable Plating Works-5th St | Milwaukee | WI | Fabricated Metal Product Manufacturing332811 | — | ◇ UNVERIFIED |
| RMRenard Machine | Green Bay | WI | Machinery Manufacturing333243 | — | ◇ UNVERIFIED |
| RFRevela Foods LLC - Colby | Colby | WI | Food Manufacturing311513 | — | ◇ UNVERIFIED |
| RCRexnord Corporation | Milwaukee | WI | Electrical Equipment, Appliance & Component Manufacturing335312 | — | ◇ UNVERIFIED |
| RIRexnord Industries INC | Milwaukee | WI | Machinery Manufacturing333610 | — | ◇ UNVERIFIED |
| RCReynolds Consumer Prod-dba-presto Products | Appleton | WI | Plastics and Rubber Products Manufacturing326110 | — | ◇ UNVERIFIED |
| RMRib Mountain Bio LLC | Athens | WI | Wood Product Manufacturing321999 | 1-19 | ◇ UNVERIFIED |
 Rie Coatings LLC | Oshkosh | WI | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| RSRiver Steel INC | La Crosse | WI | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| RDRja Dispersions LLC | Hudson | WI | Chemical Manufacturing325910 | — | ◇ UNVERIFIED |
| RRRock Road Companies INC - Townline Pit | Beloit | WI | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| RTRock Tenn Converting Company | Milwaukee | WI | Paper Manufacturing322212 | — | ◇ UNVERIFIED |
 Rockwell Automation INC | Mequon | WI | Electrical Equipment, Appliance & Component Manufacturing335310 | — | ◇ UNVERIFIED |
| RIRoyster-clark Incorporated | Madison | WI | Chemical Manufacturing325310 | — | ◇ UNVERIFIED |
| RDRr Donnelley | Monroe | WI | Paper Manufacturing322222 | — | ◇ UNVERIFIED |
| RDRr Donnelley | Green Bay | WI | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| RDRr Donnelley | West Bend | WI | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| RRR R Donnelley and Sons - Banta Curtis Reed Plant | Menasha | WI | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| RDRr Donnelley Baraboo Div | Baraboo | WI | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| RDRr Donnelley - Midway Plant | Menasha | WI | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| RURs Used Oil Services INC (former) | Wheatland | WI | Petroleum and Coal Products Manufacturing324191 | — | ◇ UNVERIFIED |
| RCRusk County Highway Department | Ladysmith | WI | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| RORust - Oleum CORP | Pleasant Prairie | WI | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| RCRytec CORP | Jackson | WI | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
 Safco Products CO Dba Mayline- Wood Plant | Sheboygan | WI | Furniture and Related Product Manufacturing337210 | — | ◇ UNVERIFIED |
| SSSafety-kleen Systems INC - Kimberly Facility - Fka U S Oil | Kimberly | WI | Petroleum and Coal Products Manufacturing324110 | — | ◇ UNVERIFIED |
| SSSaint-gobain Sgppl | Portage | WI | Chemical Manufacturing325212 | — | ◇ UNVERIFIED |
| SBSanford Business to Business | Janesville | WI | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| SASanimax Amx, LLC | Green Bay | WI | Food Manufacturing311613 | — | ◇ UNVERIFIED |
| SCSaputo Cheese - Scott St. | Fond Du Lac | WI | Food Manufacturing311510 | — | ◇ UNVERIFIED |
| SCSaputo Cheese USA Inc- Dresser | Dresser | WI | Food Manufacturing311314 | — | ◇ UNVERIFIED |
| SMSchawk Milwaukee, a Saueressig Company, Div of Matthews International | New Berlin | WI | Printing and Related Support Activities323120 | — | ◇ UNVERIFIED |
| SISchoessow INC | Portage | WI | Machinery Manufacturing333110 | — | ◇ UNVERIFIED |
| SWSchofield Waterworks-bg311 | Schofield | WI | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
