| MPMidwest Products and Engineer | Sturtevant | WI | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| MPMidwest Products and Engineering Distribution Center | Meonomonee Falls | WI | Fabricated Metal Product Manufacturing332999 | 1-19 | ◐ LIKELY ACTIVE |
| MPMidwest Products and Engineering Material Service Center | Milwaukee | WI | Fabricated Metal Product Manufacturing332999 | 1-19 | ◐ LIKELY ACTIVE |
| MWMidwest Wire Products, Inc. | Sturgeon Bay | WI | Fabricated Metal Product Manufacturing332618 | 20-99 | ◐ LIKELY ACTIVE |
| MTMillennium Technologies Plymouth | Plymouth | WI | Fabricated Metal Product Manufacturing332813 | 20-99 | ◐ LIKELY ACTIVE |
| MMilwaukee | Milwaukee | WI | Fabricated Metal Product Manufacturing332722 | 20-99 | ◐ LIKELY ACTIVE |
Milwaukee Valve Company Inc. - Prairie du Sac | Prairie Du Sac | WI | Fabricated Metal Product Manufacturing332911 | 100-499 | ◐ LIKELY ACTIVE |
| MMMke Machine, INC. | New Berlin | WI | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| MLM Labelle Consulting LLC | Hubertus | WI | Fabricated Metal Product Manufacturing332722 | — | ◐ LIKELY ACTIVE |
| MTMod Tech Industries, Inc. | Shawano | WI | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| MIModtruss INC | Allenton | WI | Fabricated Metal Product Manufacturing332311 | — | ◐ LIKELY ACTIVE |
Moria Manufacturing LLC | Monona | WI | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| MPMount Pleasant | Mount Pleasant | WI | Fabricated Metal Product Manufacturing332722 | 20-99 | ◐ LIKELY ACTIVE |
| MMpm | Manitowoc | WI | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| MCMSNMP Contech Engineered Solutions LLC | Portage | WI | Fabricated Metal Product Manufacturing332322 | 1-19 | ◐ LIKELY ACTIVE |
| MOMukwonago Operations | Mukwonago | WI | Fabricated Metal Product Manufacturing332216 | 100-499 | ◐ LIKELY ACTIVE |
| NFN117W18388 Fulton Dr | Germantown | WI | Fabricated Metal Product Manufacturing332710 | 1-19 | ◐ LIKELY ACTIVE |
| NMNelson Miller Group - Berlin WI | Berlin | WI | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| NMN.H. Machining, Inc. | Waukesha | WI | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| NSNimsgern Steel Corp. | Minocqua | WI | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| NSNorlen - Schofield | Schofield | WI | Fabricated Metal Product Manufacturing332312 | 100-499 | ◐ LIKELY ACTIVE |
| NMNorther Metal Fab | Baldwin | WI | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| NRNucor Rebar Fabrication Midwest LLC - Roberts Wisonsin | Roberts | WI | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
OEM Fabricators Inc. - Neillsville | Neillsville | WI | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
OEM Fabricators Inc. - Phillips | Phillips | WI | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| OSOmco Sumo Inc | Oconomowoc | WI | Fabricated Metal Product Manufacturing332991 | 20-99 | ◐ LIKELY ACTIVE |
| OTOmega Thermo Products LLC | Stratford | WI | Fabricated Metal Product Manufacturing332410 | 20-99 | ◐ LIKELY ACTIVE |
| OOsceola | Osceola | WI | Fabricated Metal Product Manufacturing332999 | 100-499 | ◐ LIKELY ACTIVE |
| OMOshkosh Marine Supply Company | Oshkosh | WI | Fabricated Metal Product Manufacturing332721 | — | ◐ LIKELY ACTIVE |
| PIPeters Industrial Sales & Manufacturing CO LLC | Eagle River | WI | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| POPier of D'nort | St Germain | WI | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| PSPiping Systems, Inc. | Hortonville | WI | Fabricated Metal Product Manufacturing332996 | 100-499 | ◐ LIKELY ACTIVE |
Plymouth Industries Plymouth | Plymouth | WI | Fabricated Metal Product Manufacturing332313 | 20-99 | ◐ LIKELY ACTIVE |
| PFPowder Finisher, LLC | Sturevant | WI | Fabricated Metal Product Manufacturing332812 | 1-19 | ◐ LIKELY ACTIVE |
| PSPrintron Steel Rule Die, Inc. | Neenah | WI | Fabricated Metal Product Manufacturing332216 | 20-99 | ◐ LIKELY ACTIVE |
| PIPro~Cise Inc | Eau Claire | WI | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| PTPVG Tomahawk - Samuel & Son | Tomahawk | WI | Fabricated Metal Product Manufacturing332420 | 20-99 | ◐ LIKELY ACTIVE |
| QTQuality Tank Solutions - Marshfield | Marshfield | WI | Fabricated Metal Product Manufacturing332420 | 20-99 | ◐ LIKELY ACTIVE |
| QTQuality Tank Solutions - Oconomowoc, WI | Oconomowoc | WI | Fabricated Metal Product Manufacturing332420 | 20-99 | ◐ LIKELY ACTIVE |
| RIRaybar Inc | Saukville | WI | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| RIRaybar, Inc - WAUKESHA | Waukesha | WI | Fabricated Metal Product Manufacturing332710 | 1-19 | ◐ LIKELY ACTIVE |
| RFRed Flag Cargo Security Systems LLC | Milwaukee | WI | Fabricated Metal Product Manufacturing332510 | — | ◐ LIKELY ACTIVE |
| RWRedgranite, WI | Redgranite | WI | Fabricated Metal Product Manufacturing332912 | 1-19 | ◐ LIKELY ACTIVE |
| RPRichmark Patterns, Inc. | Greenville | WI | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| RIRobinson Inc - DP3 | De Pere | WI | Fabricated Metal Product Manufacturing332322 | 100-499 | ◐ LIKELY ACTIVE |
| RIRobinson Inc - MTC | Manitowoc | WI | Fabricated Metal Product Manufacturing332322 | 100-499 | ◐ LIKELY ACTIVE |
| RLRosaire LLC | Mcfarland | WI | Fabricated Metal Product Manufacturing332994 | — | ◐ LIKELY ACTIVE |
| RMRyan Manufacturing INC. | Schofield | WI | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| RTRyerson - Therm-Tech of Waukesha, Inc. | New Berlin | WI | Fabricated Metal Product Manufacturing332811 | 20-99 | ◐ LIKELY ACTIVE |
| SASales and Service Oshkosh | Oshkosh | WI | Fabricated Metal Product Manufacturing332912 | 20-99 | ◐ LIKELY ACTIVE |