| LCLear CORP Sheboygan | Sheboygan | WI | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| LELebrecht Enterprises, INC. | New Richmond | WI | Chemical Manufacturing325991 | — | ◇ UNVERIFIED |
| LCLeft Coast Powder Coating | La Crosse | WI | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| LILumimove, INC. | Milwaukee | WI | Chemical Manufacturing325132 | — | ◇ UNVERIFIED |
| MPMadison Powder Coating LLC | Stoughton | WI | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| MMaterion | Milwaukee | WI | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| MTMatheson Tri-gas INC | Burlington | WI | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| MLMesser LLC | Beloit | WI | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| MPMetals Processing, INC | Milwaukee | WI | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| MCMichels Corporation | Brownsville | WI | Chemical Manufacturing325991 | — | ◇ UNVERIFIED |
| MDMicrobial Discovery Group | Franklin | WI | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
 Midwest Rubber Mfg L L C | Stoughton | WI | Chemical Manufacturing325520 | — | ◇ UNVERIFIED |
| MBMirus Bio LLC | Madison | WI | Chemical Manufacturing325414 | — | ◇ UNVERIFIED |
| MGMpp Group LLC | Mequon | WI | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| MSMulti-pack Solutions LLC | Milwaukee | WI | Chemical Manufacturing325620 | — | ◇ UNVERIFIED |
| MPMurmac Paint Mfg., INC. | Beloit | WI | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| NCNalco Chemical CO @ New Page (former) | Niagara | WI | Chemical Manufacturing325188 | — | ◇ UNVERIFIED |
| NSNatural Systems Utilities | Baldwin | WI | Chemical Manufacturing325311 | — | ◇ UNVERIFIED |
| NCNexgen Coatings LLC | Sheboygan Falls | WI | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| NFNohl Fabrication-a Division of the Gund Company | Milwaukee | WI | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| NANorth American Bioindustries CORP | New Berlin | WI | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| NMNorthstar Medical Radioisotopes, LLC. | Madison | WI | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| NBNovozymes Bioag, INC. | Brookfield | WI | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| OPOnline Packaging INC | Plover | WI | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
 Osi Environmental INC | Kaukauna | WI | Chemical Manufacturing325920 | — | ◇ UNVERIFIED |
| PTPAK Technologies Holding Company Inc. | Milwaukee | WI | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| PCPerformance Coatings, LLC | Oconomowoc | WI | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| PPPrecision Powder, LLC | Greenville | WI | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| PPPrecision Powder, LLC | Appleton | WI | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| PCPress Color, INC. | Glendale | WI | Chemical Manufacturing325910 | — | ◇ UNVERIFIED |
| PPrinsco | Appleton | WI | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| PSProactive Solutions Usa, LLC - De Pere | De Pere | WI | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| PLProchemicals LLC De Pere | De Pere | WI | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| PCPromega Corporation - 5500 Nobel | Fitchburg | WI | Chemical Manufacturing325413 | — | ◇ UNVERIFIED |
| PKPromega - Kornberg Center | Madison | WI | Chemical Manufacturing325413 | — | ◇ UNVERIFIED |
| PCPurple Cow Organics, LLC | Verona | WI | Chemical Manufacturing325314 | — | ◇ UNVERIFIED |
| RPReturn Processing Center LLC | Oconto | WI | Chemical Manufacturing325910 | — | ◇ UNVERIFIED |
| RHRJK Holdings LLC | Ixonia | WI | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| RCRolite CO | Hartland | WI | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| SISafc INC | Madison | WI | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| SBSandhill Bach Rng Facility | Dorchester | WI | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| SFSandhill Five Star Rng | Elk Mound | WI | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
 Schwabe North America | Green Bay | WI | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
 Shine Technologies Building One | Janesville | WI | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| Shine Technologies Casseopia | Janesville | WI | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| Shine Technologies Heliopolis | Madison | WI | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| Shine Technologies Moly Plant | Janesville | WI | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| Shine Technologies - Townline Warehouse | Beloit | WI | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| SGSiegfried Grafton INC. | Grafton | WI | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| SASigma Aldrich CO LLC | Milwaukee | WI | Chemical Manufacturing325188 | — | ◇ UNVERIFIED |
