| MSMetal Spinners Angola | Angola | IN | Fabricated Metal Product Manufacturing332119 | 20-99 | ◐ LIKELY ACTIVE |
| MMMid-South Metal Products Inc IN | Elkhart | IN | Fabricated Metal Product Manufacturing332311 | 1-19 | ◐ LIKELY ACTIVE |
| MCMPP Campbellsburg | Campbellsburg | IN | Fabricated Metal Product Manufacturing332117 | 100-499 | ◐ LIKELY ACTIVE |
| MMMqp Machining LLC | Springville | IN | Fabricated Metal Product Manufacturing332710 | — | ▲ REPORTED CLOSED |
| MIMultitech Industries, Inc. | Michigan City | IN | Fabricated Metal Product Manufacturing332722 | 20-99 | ◐ LIKELY ACTIVE |
| MIMultitech Industries, Inc. | Thorntown | IN | Fabricated Metal Product Manufacturing332722 | 20-99 | ◐ LIKELY ACTIVE |
| MMuncie | Muncie | IN | Fabricated Metal Product Manufacturing332813 | 20-99 | ◐ LIKELY ACTIVE |
| Mmunster1501 | Hammond | IN | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| NTNachi Technology Inc. | Greenwood | IN | Fabricated Metal Product Manufacturing332991 | 20-99 | ▲ REPORTED CLOSED |
| NANew Albany, IN | New Albany | IN | Fabricated Metal Product Manufacturing332313 | 20-99 | ◐ LIKELY ACTIVE |
| NINix Industrial - Frontage Road | Poseyville | IN | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| NINix Industrial - Main Street | Poseyville | IN | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| NINix Industrial - Rockport, IN | Rockport | IN | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| NMNorthside Machining, INC | Huntingburg | IN | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| NDNucor Data Systems | Madison | IN | Fabricated Metal Product Manufacturing332322 | 20-99 | ◐ LIKELY ACTIVE |
| NINucor Insulated Panel Group - Waterloo | Waterloo | IN | Fabricated Metal Product Manufacturing332311 | 20-99 | ◐ LIKELY ACTIVE |
| NRNucor Rebar Fabrication Midwest LLC Mooresville, Indiana | Mooresville | IN | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| NRNucor Rebar Fabrication Services Center Corp | Fort Wayne | IN | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| NTNucor Towers and Structures Indiana | New Ross | IN | Fabricated Metal Product Manufacturing332312 | 100-499 | ◐ LIKELY ACTIVE |
| NDNucor (Vulcraft Division) | Saint Joe | IN | Fabricated Metal Product Manufacturing332312 | 100-499 | ◐ LIKELY ACTIVE |
| OIOMS Indianapolis | Indianapolis | IN | Fabricated Metal Product Manufacturing332313 | 20-99 | ◐ LIKELY ACTIVE |
| PIPaco Indiana | Clarksville | IN | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| PDPaul's Demotte | Demotte | IN | Fabricated Metal Product Manufacturing332439 | 1-19 | ◐ LIKELY ACTIVE |
| PEPaul's Elkhart Lusher | Elkhart | IN | Fabricated Metal Product Manufacturing332439 | 1-19 | ◐ LIKELY ACTIVE |
| PEPaul's Elkhart North | Elkhart | IN | Fabricated Metal Product Manufacturing332439 | 1-19 | ◐ LIKELY ACTIVE |
| PFPaul's Fort Wayne | Fort Wayne | IN | Fabricated Metal Product Manufacturing332439 | 1-19 | ◐ LIKELY ACTIVE |
| PGPaul's Gary | Gary | IN | Fabricated Metal Product Manufacturing332439 | 1-19 | ◐ LIKELY ACTIVE |
| PKPaul's Knox | Knox | IN | Fabricated Metal Product Manufacturing332439 | 1-19 | ◐ LIKELY ACTIVE |
| PKPaul's Kokomo | Kokomo | IN | Fabricated Metal Product Manufacturing332439 | 1-19 | ◐ LIKELY ACTIVE |
| PLPaul's Lake Station | Lake Station | IN | Fabricated Metal Product Manufacturing332439 | 1-19 | ◐ LIKELY ACTIVE |
| PLPaul's Logansport | Logansport | IN | Fabricated Metal Product Manufacturing332439 | 1-19 | ◐ LIKELY ACTIVE |
| PMPaul's Merrillville | Merrillville | IN | Fabricated Metal Product Manufacturing332439 | 1-19 | ◐ LIKELY ACTIVE |
| PSPaul's South Bend | South Bend | IN | Fabricated Metal Product Manufacturing332439 | 20-99 | ◐ LIKELY ACTIVE |
| PTPaul's Terre Haute | Terre Haute | IN | Fabricated Metal Product Manufacturing332439 | 1-19 | ◐ LIKELY ACTIVE |
| PIPCI Indianapolis Prefab (550) | Anderson | IN | Fabricated Metal Product Manufacturing332311 | 20-99 | ◐ LIKELY ACTIVE |
| P1Plant 1 | Columbia City | IN | Fabricated Metal Product Manufacturing332999 | 100-499 | ◐ LIKELY ACTIVE |
| P2Plant 2 | Fort Wayne | IN | Fabricated Metal Product Manufacturing332813 | 20-99 | ◐ LIKELY ACTIVE |
| P6Plant 6 | Goshen | IN | Fabricated Metal Product Manufacturing332323 | 20-99 | ◐ LIKELY ACTIVE |
| PFPortland Forge - Portland, IN | Portland | IN | Fabricated Metal Product Manufacturing332111 | 100-499 | ◐ LIKELY ACTIVE |
| PHPrecision Heat Treating Corporation | Fort Wayne | IN | Fabricated Metal Product Manufacturing332811 | 20-99 | ◐ LIKELY ACTIVE |
| PPPrecision Processes Division | Walkerton | IN | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| PSPrecision Stamping Inc. | Elkhart | IN | Fabricated Metal Product Manufacturing332119 | 20-99 | ◐ LIKELY ACTIVE |
| PPProduction Paint Stripping - Batesville | Batesville | IN | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| PLPro-Flex, LLC | Hillsboro | IN | Fabricated Metal Product Manufacturing332996 | 20-99 | ◐ LIKELY ACTIVE |
| PEPyrotek Evansville | Evansville | IN | Fabricated Metal Product Manufacturing332311 | 1-19 | ◐ LIKELY ACTIVE |
| RPRBC Plymouth | Plymouth | IN | Fabricated Metal Product Manufacturing332991 | 20-99 | ◐ LIKELY ACTIVE |
| RIRC Industries | Elkhart | IN | Fabricated Metal Product Manufacturing332439 | 100-499 | ◐ LIKELY ACTIVE |
| RMReber Machine and Tool Co., Inc | Muncie | IN | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| RRRegal Rexnord | Monticello | IN | Fabricated Metal Product Manufacturing332991 | 100-499 | ◐ LIKELY ACTIVE |
| RCREM Chemicals RU3 IN | Merrillville | IN | Fabricated Metal Product Manufacturing332813 | 1-19 | ◐ LIKELY ACTIVE |