| MWMicrotech Welding Corp. | Fort Wayne | IN | Machinery Manufacturing333992 | 20-99 | ◐ LIKELY ACTIVE |
| MPMidwestern Pet Foods | Evansville | IN | Food Manufacturing311111 | 100-499 | ◐ LIKELY ACTIVE |
| MMMidwest Mfg / Packer Brothers | Thorntown | IN | Machinery Manufacturing333112 | 1-19 | ◐ LIKELY ACTIVE |
| MSMid-West Spring & Stamping | Mentone | IN | Fabricated Metal Product Manufacturing332613 | 20-99 | ◐ LIKELY ACTIVE |
| MCMinnick Concrete Service | Fort Wayne | IN | Nonmetallic Mineral Product Manufacturing327331 | 20-99 | ◐ LIKELY ACTIVE |
| MLMohawk Laboratories Div Nch CO | Indianapolis | IN | Petroleum and Coal Products Manufacturing324191 | — | ◐ LIKELY ACTIVE |
| MPMomentive Performance Materials | Garrett | IN | Chemical Manufacturing325211 | 20-99 | ◐ LIKELY ACTIVE |
| MDMonosol Duneland Plant | Portage | IN | Chemical Manufacturing325220 | — | ◐ LIKELY ACTIVE |
| MMMoore Metal Works, LLC | Evansville | IN | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| MIMossberg Industries, Inc. | Garrett | IN | Machinery Manufacturing333248 | 20-99 | ◐ LIKELY ACTIVE |
| MIMpi International LLC | Knox | IN | Fabricated Metal Product Manufacturing332116 | — | ◐ LIKELY ACTIVE |
| NSNational Starch LLC - Indianapolis | Indianapolis | IN | Food Manufacturing311221 | — | ◐ LIKELY ACTIVE |
| NUNestle USA INC Beverage Div | Anderson | IN | Food Manufacturing311511 | — | ◐ LIKELY ACTIVE |
| NTNetshape Technologies - Campbellsburg Facility | Campbellsburg | IN | Fabricated Metal Product Manufacturing332117 | — | ◐ LIKELY ACTIVE |
| NINew Indy Containerboard Hartford City Mill | Hartford City | IN | Paper Manufacturing322120 | — | ◐ LIKELY ACTIVE |
| NMNew Millenium Building Systems LLC | Butler | IN | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| NPNice-pak Products, INC. | Mooresville | IN | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| NCNishikawa Cooper LLC | Topeka | IN | Textile Mills313320 | — | ◐ LIKELY ACTIVE |
| NINlmk Indiana | Portage | IN | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| NINoblitt International Corporation | Columbus | IN | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
North American Latex Corporation | Sullivan | IN | Plastics and Rubber Products Manufacturing326299 | 20-99 | ◐ LIKELY ACTIVE |
| NINorthwest Industrial Specialist INC | East Chicago | IN | Miscellaneous Manufacturing339950 | 1-19 | ◐ LIKELY ACTIVE |
| NBNucor Building Systems | Waterloo | IN | Fabricated Metal Product Manufacturing332311 | 500+ | ◐ LIKELY ACTIVE |
| NVNucor Vulcraft Group Saint Joe Div | Saint Joe | IN | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
Numerix INC | Columbia City | IN | Fabricated Metal Product Manufacturing332710 | 1-19 | ◐ LIKELY ACTIVE |
| OIOcella, INC | Newberry | IN | Electrical Equipment, Appliance & Component Manufacturing335910 | 1-19 | ◐ LIKELY ACTIVE |
Ofs Brands Holdings INC Plant 3 | Huntingburg | IN | Furniture and Related Product Manufacturing337121 | 100-499 | ◐ LIKELY ACTIVE |
Ofs Brands Holdings INC Plant 9 | Huntingburg | IN | Furniture and Related Product Manufacturing337211 | 20-99 | ◐ LIKELY ACTIVE |
| OBOfs Brands INC Plant #5 | Huntingburg | IN | Furniture and Related Product Manufacturing337211 | 1-19 | ◐ LIKELY ACTIVE |
| OBOfs Brands - Plant 1 | Huntingburg | IN | Furniture and Related Product Manufacturing337211 | 100-499 | ◐ LIKELY ACTIVE |
| OTOil Technology, Inc./u.s. Steel Gary | Gary | IN | Petroleum and Coal Products Manufacturing324199 | — | ◐ LIKELY ACTIVE |
Onspot of North America, INC. | North Vernon | IN | Fabricated Metal Product Manufacturing332618 | 20-99 | ◐ LIKELY ACTIVE |
| OKOpta- Kingsbury | Kingsbury | IN | Nonmetallic Mineral Product Manufacturing327410 | 1-19 | ◐ LIKELY ACTIVE |
Orthoamerica Holdings, LLC | Franklin | IN | Miscellaneous Manufacturing339114 | 20-99 | ◐ LIKELY ACTIVE |
| PCParagon Casket INC | Richmond | IN | Miscellaneous Manufacturing339995 | 20-99 | ◐ LIKELY ACTIVE |
Patrick Industries INC Dba Middlebury H | Middlebury | IN | Furniture and Related Product Manufacturing337110 | — | ◐ LIKELY ACTIVE |
Patrick Industries Incorporated Dba Bet | Bremen | IN | Plastics and Rubber Products Manufacturing326199 | — | ◐ LIKELY ACTIVE |
Patrick Industries Incorporated Dba Better Way Products | New Paris | IN | Plastics and Rubber Products Manufacturing326199 | — | ◐ LIKELY ACTIVE |
| PIPenway INC | Edinburgh | IN | Fabricated Metal Product Manufacturing332420 | 20-99 | ◐ LIKELY ACTIVE |
| PFPerdue Farms Incorporated, Washington Facility | Washington | IN | Food Manufacturing311615 | — | ◐ LIKELY ACTIVE |
| PPPerfection Products Inc | Lebanon | IN | Fabricated Metal Product Manufacturing332119 | 1-19 | ◐ LIKELY ACTIVE |
| PBPermabase Building Products, LLC | Clinton | IN | Nonmetallic Mineral Product Manufacturing327310 | 20-99 | ◐ LIKELY ACTIVE |
| PMPersonnel Management Services Inc | Poseyville | IN | Chemical Manufacturing325991 | 100-499 | ◐ LIKELY ACTIVE |
| PAPlastimatic Arts Corporation | Mishawaka | IN | Printing and Related Support Activities323113 | 20-99 | ◐ LIKELY ACTIVE |
| PVPleasant View Dairy Corporation | Highland | IN | Food Manufacturing311511 | 20-99 | ◐ LIKELY ACTIVE |
| PTPlymouth Tube Company | Winamac | IN | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
Polycraft Products Inc. | Greendale | IN | Transportation Equipment Manufacturing336412 | 20-99 | ◐ LIKELY ACTIVE |
| PPPratt Paper (in) LLC | Valparaiso | IN | Paper Manufacturing322121 | 100-499 | ◐ LIKELY ACTIVE |
| PTPrecision Tank & Equipment | Ligonier | IN | Plastics and Rubber Products Manufacturing326199 | — | ◐ LIKELY ACTIVE |
| PMPrecoat Metals a Division of Sequa CORP | Greenfield | IN | Fabricated Metal Product Manufacturing332812 | — | ◐ LIKELY ACTIVE |