| TITrudell Industrial Finishing | De Pere | — | ◇ UNVERIFIED |
| TITrudell Industrial Finishing LLC | De Pere | — | ◇ UNVERIFIED |
| TGTweet Garot Mechanical, INC. | Tomahawk | — | ◇ UNVERIFIED |
| UMUmi Metalfab | Menomonee Falls | — | ◇ UNVERIFIED |
| UDUniversal Die and Stamping | Prairie Du Sac | — | ◇ UNVERIFIED |
| UTUtility Tool and Trailer | Clintonville | — | ◇ UNVERIFIED |
| WCWaukesha Cherry Burrell | Delavan | — | ◇ UNVERIFIED |
Western Industries INC | Watertown | — | ◇ UNVERIFIED |
| WMWilson-hurd Mfg CO INC | Wausau | — | ◇ UNVERIFIED |
| WFWisconsin Finishes | Verona | — | ◇ UNVERIFIED |
| WPWisconsin Plating Works, INC. | Racine | — | ◇ UNVERIFIED |
| WPWoller Precision Machine LLC | Coleman | — | ◇ UNVERIFIED |
| WCWorthington Cylinders-gerett Products | Menomonee Falls | — | ◇ UNVERIFIED |
| ZIZinc INC | Slinger | — | ◇ UNVERIFIED |
| 11 | Kenosha | 1–19 | ◐ LIKELY ACTIVE |
| 3T305 Travis Lane - Therm-tech of Waukesha, INC. | Waukesha | 20–99 | ◐ LIKELY ACTIVE |
| 3U3 Up Metal Works LLC | Milwaukee | — | ◐ LIKELY ACTIVE |
| EC"4016 - Eau Claire Prehung SDM" | Eau Claire | 20–99 | ◐ LIKELY ACTIVE |
| 4E4Front Engineered Solutions - Kenosha | Kenosha | 100–499 | ◐ LIKELY ACTIVE |
| 4E4Front Engineered Solutions- Muskego | Muskego | 100–499 | ◐ LIKELY ACTIVE |
| 5P5 Point Fabrication, LLC | Green Bay | 20–99 | ◐ LIKELY ACTIVE |
| ASAalberts Surface Technologies- Milwaukee | Milwaukee | 1–19 | ◐ LIKELY ACTIVE |
| ASAalberts Surface Technologies Oshkosh, INC. | Oshkosh | — | ◐ LIKELY ACTIVE |
| ASAalberts Surface Technologies Pp, LLC | Pleasant Prairie | — | ◐ LIKELY ACTIVE |
| AOACI - Oshkosh | Oshkosh | 20–99 | ◐ LIKELY ACTIVE |
| AWACI - West Bend | West Bend | 20–99 | ◐ LIKELY ACTIVE |
| AMAdams Metal Project, LLC | Waupun | — | ◐ LIKELY ACTIVE |
Advance Screw Products, INC | St Francis | — | ◐ LIKELY ACTIVE |
| AEA & E Tools | Racine | 100–499 | ◐ LIKELY ACTIVE |
| AIAgristeel, Inc. | Oshkosh | 20–99 | ◐ LIKELY ACTIVE |
| AMAJ Manufacturing, Inc. 105 Riggs Street | Bloomer | 100–499 | ◐ LIKELY ACTIVE |
| AMAJ Manufacturing, Inc. 1217 Oak Street | Bloomer | 20–99 | ◐ LIKELY ACTIVE |
| AMAJ Manufacturing, Inc. 507 Main Street | Bloomer | 20–99 | ◐ LIKELY ACTIVE |
| AMAJ Manufacturing, Inc. 521 Main Street | Bloomer | 20–99 | ◐ LIKELY ACTIVE |
| AWAlloy Welding Inc | Caledonia | 20–99 | ◐ LIKELY ACTIVE |
| ABAmerican Bin and Conveyor LLC | Burlington | 20–99 | ◐ LIKELY ACTIVE |
| ADAmerican Defense Manufacturing Products, LLC | New Berlin | — | ◐ LIKELY ACTIVE |
| AAAmron, A Division of AMTEC Corp | Antigo | 100–499 | ◐ LIKELY ACTIVE |
| AIArgo Industries Inc | Brookfield | 20–99 | ◐ LIKELY ACTIVE |
| ATArrow Tool & Stamping Company, Inc | Milwaukee | 20–99 | ◐ LIKELY ACTIVE |
| ADASI Doors, Inc. | Milwaukee | 20–99 | ◐ LIKELY ACTIVE |
| APAstro Pak LLC - Wisconsin | Middletion | 1–19 | ◐ LIKELY ACTIVE |
| ALAtcam LLC | Little Chute | 20–99 | ◐ LIKELY ACTIVE |
| AFATI Forged Products - Coon Valley Operations | Coon Valley | 20–99 | ◐ LIKELY ACTIVE |
| AFATI Forged Products - Cudahy Operations | Cudahy | 500+ | ◐ LIKELY ACTIVE |
| ALAyersTech LLC | Chetek | 1–19 | ◐ LIKELY ACTIVE |
| AIAZCO INC. - Holly Road | Neenah | 20–99 | ◐ LIKELY ACTIVE |
| AMAZCO Metal Fab Shop | Greenville | 20–99 | ◐ LIKELY ACTIVE |
| AEAztalan Engineering, Inc. | Lake Mills | 20–99 | ◐ LIKELY ACTIVE |
| AGAZZ Galvanizing and Plating - Milwaukee LLC | Milwaukee | 20–99 | ◐ LIKELY ACTIVE |