| SSpartech | Kohler | WI | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| SPSpartech Plastics | Sheboygan Falls | WI | Chemical Manufacturing325991 | — | ◇ UNVERIFIED |
| SSS & S Coatings INC / Plant 2 | Osceola | WI | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| SPStatewide Powder Coating LLC | New London | WI | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| SStratatech | Madison | WI | Chemical Manufacturing325414 | — | ◇ UNVERIFIED |
| SCSummit Clinical Laboratories | Brookfield | WI | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| SISyncro INC | Milwaukee | WI | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| TVThe Valspar Corporation | Menomonee Falls | WI | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| TWThird Wave Technologies INC | Sun Prairie | WI | Chemical Manufacturing325414 | — | ◇ UNVERIFIED |
| TWTotal Water Treatment Systems, INC | Madison | WI | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| TSTrade Show Channel, LLC | Evansville | WI | Chemical Manufacturing325620 | — | ◇ UNVERIFIED |
| TITrowelon INC | Oneida | WI | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| TLTuma LLC | Elmwood | WI | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| TTTundra Targeted Therapeutics, Inc. | Shorewood | WI | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| ULUas Labs LLC | Wausau | WI | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| URUnlimited Renewables, LLC | Lake Mills | WI | Chemical Manufacturing325311 | — | ◇ UNVERIFIED |
| USU S Energy Rng Deer Run | Kewaunee | WI | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| USU S Energy Rng Facility Clover Hill | Ashford | WI | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| UEU.s. Energy Rng Facility Dallmann | Brillion | WI | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| UGU.s. Gain Rng Facility S&s | Sturgeon Bay | WI | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| VValspar | Phillips | WI | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| VFVolatile Free INC | Waukesha | WI | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| VVVp Vacuum Platers LLC | Mauston | WI | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| WTWisconsin Tool & Mold Co., INC. | Friendship | WI | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
