| MAMBC Aerosol | Elgin | IL | Machinery Manufacturing333993 | 20-99 | ◐ LIKELY ACTIVE |
| MTMcCurdy Tool and Machining Company | Caledonia | IL | Machinery Manufacturing333515 | 20-99 | ◐ LIKELY ACTIVE |
McLaughlin Body Company - Rock Island | Rock Island | IL | Machinery Manufacturing333111 | 100-499 | ◐ LIKELY ACTIVE |
| MHMFS Holdings | Mchenry | IL | Machinery Manufacturing333120 | 20-99 | ◐ LIKELY ACTIVE |
| MPMicro Products Co | Peoria | IL | Machinery Manufacturing333992 | 20-99 | ◐ LIKELY ACTIVE |
| MMMiddleby Marshall Inc. | Elgin | IL | Machinery Manufacturing333310 | 20-99 | ◐ LIKELY ACTIVE |
| MPMiddleby Packaging Solutions - Elgin | Elgin | IL | Machinery Manufacturing333993 | 100-499 | ◐ LIKELY ACTIVE |
| MPMidOpt Palatine | Palatine | IL | Machinery Manufacturing333314 | 20-99 | ◐ LIKELY ACTIVE |
| MBMidwest Blow Molding LLC | Vandalia | IL | Machinery Manufacturing333111 | 1-19 | ◐ LIKELY ACTIVE |
| MFMid-west Feeder, INC. | Belvidere | IL | Machinery Manufacturing333515 | — | ◐ LIKELY ACTIVE |
| MIMidwest Industrial Sales | Gardner | IL | Machinery Manufacturing333120 | 20-99 | ◐ LIKELY ACTIVE |
| MWMiller Welding Automation | Carol Stream | IL | Machinery Manufacturing333992 | 20-99 | ◐ LIKELY ACTIVE |
| MEMiner Elastomer Products Corporation | Geneva | IL | Machinery Manufacturing333249 | 20-99 | ◐ LIKELY ACTIVE |
| MIMinuteman International, INC. | Pingree Grove | IL | Machinery Manufacturing333120 | — | ◐ LIKELY ACTIVE |
| MLMitsubishi Logisnext Americas Marengo | Marengo | IL | Machinery Manufacturing333924 | 100-499 | ◐ LIKELY ACTIVE |
| MMokena | Mokena | IL | Machinery Manufacturing333612 | 20-99 | ◐ LIKELY ACTIVE |
| MTMorrison Timing Screw Co dba Morrison Container Handling Solutions | Glenwood | IL | Machinery Manufacturing333993 | 100-499 | ◐ LIKELY ACTIVE |
| MPMotion Perpetual LLC | Oakbrook Terrace | IL | Machinery Manufacturing333998 | — | ◐ LIKELY ACTIVE |
Motion Systems Machesney Park | Machesney Park | IL | Machinery Manufacturing333995 | 20-99 | ◐ LIKELY ACTIVE |
| NGNalco Glenwood, IL Manufacturing | Glenwood | IL | Machinery Manufacturing333310 | 20-99 | ◐ LIKELY ACTIVE |
| NCNB Corporation of America | Hanover Park | IL | Machinery Manufacturing333613 | 20-99 | ◐ LIKELY ACTIVE |
| NFNorman Filter Company & Norman Equipment Company | Bridgeview | IL | Machinery Manufacturing333999 | 20-99 | ◐ LIKELY ACTIVE |
| NANorth American Clutch & Driveline, Inc | Machesney Park | IL | Machinery Manufacturing333613 | 20-99 | ◐ LIKELY ACTIVE |
| OIOakley Industrial Machinery INC. | Elk Grove Village | IL | Machinery Manufacturing333994 | 1-19 | ◐ LIKELY ACTIVE |
| OTOregon Tool - Oregon (IL) | Oregon | IL | Machinery Manufacturing333111 | 100-499 | ◐ LIKELY ACTIVE |
| OUOSG USA, Inc Bensenville | Bensenville | IL | Machinery Manufacturing333515 | 100-499 | ◐ LIKELY ACTIVE |
| PSPanel Shop | New Lenox | IL | Machinery Manufacturing333612 | 100-499 | ◐ LIKELY ACTIVE |
| PHParker Hannifin Corporation | Des Plaines | IL | Machinery Manufacturing333995 | — | ◐ LIKELY ACTIVE |
| PCParkson Corporation Vernon Hills | Vernon Hills | IL | Machinery Manufacturing333318 | 100-499 | ◐ LIKELY ACTIVE |
| PRPentair - Roselle | Roselle | IL | Machinery Manufacturing333318 | 100-499 | ◐ LIKELY ACTIVE |
| PCPeoria Cibes Symmetry | Peoria | IL | Machinery Manufacturing333921 | 20-99 | ◐ LIKELY ACTIVE |
| PHPeters Heating and Air Conditioning, INC. | Quincy | IL | Machinery Manufacturing333415 | — | ◐ LIKELY ACTIVE |
| PCPhoenix Closures | Aurora | IL | Machinery Manufacturing333249 | 100-499 | ◐ LIKELY ACTIVE |
| P1Plant 1 | Dixon | IL | Machinery Manufacturing333613 | 100-499 | ◐ LIKELY ACTIVE |
| PUPlasmatreat USA INC. | Elgin | IL | Machinery Manufacturing333517 | — | ◐ LIKELY ACTIVE |
| PKPMI Kyoto Packaging Systems | Elk Grove Village | IL | Machinery Manufacturing333993 | 100-499 | ◐ LIKELY ACTIVE |
| PCPower Curbers Companies | Mchenry | IL | Machinery Manufacturing333120 | 20-99 | ◐ LIKELY ACTIVE |
| PSPower Services Group - Melrose | Melrose Park | IL | Machinery Manufacturing333611 | 20-99 | ◐ LIKELY ACTIVE |
| PBPro Beam USA INC | Plainfield | IL | Machinery Manufacturing333992 | — | ◐ LIKELY ACTIVE |
| PPProduct Planning INC | Elk Grove Village | IL | Machinery Manufacturing333923 | — | ◐ LIKELY ACTIVE |
| PTProvisur Technologies Mokena | Mokena | IL | Machinery Manufacturing333241 | 100-499 | ◐ LIKELY ACTIVE |
| RWRapak- Woodridge | Woodridge | IL | Machinery Manufacturing333993 | 1-19 | ◐ LIKELY ACTIVE |
| RBRed Bud Industries, INC. | Red Bud | IL | Machinery Manufacturing333519 | 100-499 | ◐ LIKELY ACTIVE |
| RRRegal Rexnord | South Beloit | IL | Machinery Manufacturing333613 | 20-99 | ◐ LIKELY ACTIVE |
| RMReg-Ellen Machine Tool Corporation | Rockford | IL | Machinery Manufacturing333517 | 20-99 | ◐ LIKELY ACTIVE |
| RLReger Laser INC | Romeoville | IL | Machinery Manufacturing333248 | — | ◐ LIKELY ACTIVE |
| RGReliance Gear Corporation | Elmhurst | IL | Machinery Manufacturing333515 | — | ◐ LIKELY ACTIVE |
| RERemote EE | Montgomery | IL | Machinery Manufacturing333922 | 20-99 | ◐ LIKELY ACTIVE |
| RIRexnord Industries, LLC | Downers Grove | IL | Machinery Manufacturing333613 | — | ◐ LIKELY ACTIVE |
| RERheo Engineering | Peoria | IL | Machinery Manufacturing333249 | 20-99 | ◐ LIKELY ACTIVE |