| MGMidwest Generation LLC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MMMidwest Manufacturing and Distributing, INC. Dba Midwest Metal Forming | Chicago | IL | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| MMMidwest Mycelium LLC | Chicago | IL | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| MMMiles Mcneel Design inc. | Chicago | IL | Miscellaneous Manufacturing339910 | — | ◇ UNVERIFIED |
| MPMiller Products INC | Chicago | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| MPMiracle Press CO | Chicago | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| MVMjd Ventures LLC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MEMks Energies INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MMobil | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MMobil | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MSModern Sprout LLC | Chicago | IL | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| MCMollys Cupcakes Chicago LLC | Chicago | IL | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| MMMonami Mobil 2 | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MWMonda Window & Door, CORP. | Chicago | IL | Fabricated Metal Product Manufacturing332321 | — | ◇ UNVERIFIED |
| MLMonosol LLC | Chicago | IL | Plastics and Rubber Products Manufacturing326113 | — | ◇ UNVERIFIED |
| MPMps Paper Tube & Can | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MOMrc Operations, LLC | Chicago | IL | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| MIMw Ii INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NDNakamon Design LLC | Chicago | IL | Miscellaneous Manufacturing339910 | — | ◇ UNVERIFIED |
| NMNational Material Processing, LLC | Chicago | IL | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| NPNational Processing Company | Chicago | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| NINavistar, INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NANeon Art Llc | Chicago | IL | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| NLNeshamah LLC | Chicago | IL | Furniture and Related Product Manufacturing337910 | — | ◇ UNVERIFIED |
| NNestle | Chicago | IL | Beverage and Tobacco Product Manufacturing312111 | — | ◇ UNVERIFIED |
| NDNetrality Data Center | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NENew England Cement CORP INC | Chicago | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| NPNext Partners, LLC | Chicago | IL | Food Manufacturing311942 | — | ◇ UNVERIFIED |
| NLNirvana9 LLC | Chicago | IL | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| NJN Jaravelil Petroleum | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NMNoor Mart INC Bp | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NANorth America Stevedoring CO (nasco) | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NHNorth & Harlem | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NGN&p Group INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NTNumat Technologies | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OLOak Lawn Svc | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OAObsidian Asphalt Paving, Inc. | Chicago | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| OCOdious Cellars, LLC | Chicago | IL | Beverage and Tobacco Product Manufacturing312120 | — | ◇ UNVERIFIED |
| OCOff Color Brewing LLC | Chicago | IL | Beverage and Tobacco Product Manufacturing312120 | — | ◇ UNVERIFIED |
| OMOgden Minuteman Citgo - Ogden Amstar | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OAOhare Airport | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OGOk Gas & Food Mart | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OAOmega Autotech INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OIOmega Iii LLC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OSOne Stop | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OTOn Taps LTD. | Chicago | IL | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| OIOrion Industries, LTD. | Chicago | IL | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| OCO&s CORP | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OSO & S Dental, INC. | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OMOsorio Metals Supply, Inc. | Chicago | IL | Fabricated Metal Product Manufacturing332311 | — | ◇ UNVERIFIED |