| MPModern Plastics Design | Madison, WI | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| MTMonroe Truck Equipment (conversion Shop) | Monroe, WI | Transportation Equipment Manufacturing336211 | — | ◇ UNVERIFIED |
| MFMorningstar Foods INC | Madison, WI | Food Manufacturing311510 | — | ◇ UNVERIFIED |
| MMMorris Material Handling | Windsor, WI | Machinery Manufacturing333920 | — | ◇ UNVERIFIED |
| MWMpi - Wis Fineblanking Div | Deerfield, WI | Transportation Equipment Manufacturing336370 | — | ◇ UNVERIFIED |
| NINastar, INC | Middleton, WI | Printing and Related Support Activities323119 | — | ◇ UNVERIFIED |
| NINateNeesvig, Inc. | Monona, WI | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| NLNessAlla LLC | Madison, WI | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| NLNessAlla LLC | Madison, WI | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| NPNewsletter Press INC. | Madison, WI | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| NUNobbits USA LLC | Madison, WI | Apparel Manufacturing315990 | — | ◇ UNVERIFIED |
| NMNorthstar Medical Radioisotopes, LLC. | Madison, WI | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| OBOM Boys Food Movement, LLC | Madison, WI | — | — | ◇ UNVERIFIED |
| OFOrbia Fluor & Energy Materials, USA INC. | Madison, WI | Electrical Equipment, Appliance & Component Manufacturing335910 | — | ◇ UNVERIFIED |
| POPan O Gold | Sun Prairie, WI | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| PDPayne & Dolan #5 - Verona Plant | Fitchburg, WI | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| PDPayne & Dolan #6-vienna | Waunakee, WI | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| PTPayne, Tiede, Nechkash LLC | Fitchburg, WI | Food Manufacturing311821 | — | ◇ UNVERIFIED |
| PMPearlsnap Machine Works, LLC | Madison, WI | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| PAPgw Auto Glass, LLC | Madison, WI | Nonmetallic Mineral Product Manufacturing327215 | — | ◇ UNVERIFIED |
| PTPhoenix Technique LLC | Middleton, WI | Transportation Equipment Manufacturing336310 | — | ◇ UNVERIFIED |
| PCPlacon Corporation Dba Ecostar | Fitchburg, WI | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| PIPlastic Ingenuity INC | Mazomanie, WI | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| PCPolyone CORP | De Forest, WI | Plastics and Rubber Products Manufacturing326299 | — | ◇ UNVERIFIED |
| PDPolyone Designed Structures and Solutions | Portage, WI | Plastics and Rubber Products Manufacturing326100 | — | ◇ UNVERIFIED |
| PIPoynette Iron Works LLC | Poynette, WI | Fabricated Metal Product Manufacturing332320 | — | ◇ UNVERIFIED |
| PHPrairie Hardwoods LLC | Sun Prairie, WI | Wood Product Manufacturing321211 | — | ◇ UNVERIFIED |
| PMPrefinished Millwork CORP | Middleton, WI | Wood Product Manufacturing321910 | — | ◇ UNVERIFIED |
| PCPromega Corporation - 5500 Nobel | Fitchburg, WI | Chemical Manufacturing325413 | — | ◇ UNVERIFIED |
| PKPromega - Kornberg Center | Madison, WI | Chemical Manufacturing325413 | — | ◇ UNVERIFIED |
| PMPro Metal Works, INC. | De Forest, WI | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| PCPurple Cow Organics, LLC | Verona, WI | Chemical Manufacturing325314 | — | ◇ UNVERIFIED |
| QBQuince Berry Properties LLC | Madison, WI | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| RERenewable Energy Group, LLC | De Forest, WI | Petroleum and Coal Products Manufacturing324110 | — | ◇ UNVERIFIED |
| RAResearch and Development Center (rdc) | Madison, WI | Chemical Manufacturing325413 | — | ◇ UNVERIFIED |
| RPResearch Products CORP | Madison, WI | Machinery Manufacturing333410 | — | ◇ UNVERIFIED |
| RPResearch Products Corporation | Madison, WI | Machinery Manufacturing333413 | — | ◇ UNVERIFIED |
| RIRhodes International, INC. | Columbus, WI | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| RBRight Bauer, LLC | Madison, WI | Beverage and Tobacco Product Manufacturing312120 | — | ◇ UNVERIFIED |
| RDRising Dough, Inc. | Madison, WI | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| RCRock Creek Barrels, INC. | Albany, WI | Fabricated Metal Product Manufacturing332994 | — | ◇ UNVERIFIED |
| RKRoth Kase USA LTD | Monroe, WI | Food Manufacturing311513 | — | ◇ UNVERIFIED |
| SPS1S Properties, LLC | Dekorra, WI | Fabricated Metal Product Manufacturing332721 | — | ◇ UNVERIFIED |
| SISafc INC | Madison, WI | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| SUSanimax USA LLC | De Forest, WI | Food Manufacturing311225 | — | ◇ UNVERIFIED |
| SCSavannah Company | Waunakee, WI | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| SBSawyer B LLC | Madison, WI | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| SISchoep's Ice Cream Co., INC. | Madison, WI | Food Manufacturing311520 | — | ◇ UNVERIFIED |
| SPScientific Protein Labs INC | Waunakee, WI | Food Manufacturing311999 | — | ◇ UNVERIFIED |
 Shine Technologies Heliopolis | Madison, WI | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
