| SSSterling Systems & Controls | Sterling | 20–99 | ◐ LIKELY ACTIVE |
| WCWindy City Wire Cable and Technology Products, LLC | Bolingbrook | — | ◐ LIKELY ACTIVE |
| DCDelta-unibus Corporation | Northlake | — | ◐ LIKELY ACTIVE |
| MLMolex LLC | Monee | — | ◐ LIKELY ACTIVE |
| SIStarterpanel INC. | Machesney Park | 1–19 | ◐ LIKELY ACTIVE |
| AIAltorfer INC | Peoria | — | ◇ UNVERIFIED |
| AGAmerican Generator & Armature CO | Skokie | — | ◇ UNVERIFIED |
| ACAutotrol CORP | Crystal Lake | — | ◇ UNVERIFIED |
| BCBell City Battery Mfg CO | Belleville | — | ◇ UNVERIFIED |
| BEBellwood Electric Motors | Bellwood | — | ◇ UNVERIFIED |
| BBBig Beam Emergency Systems INC | Crystal Lake | — | ◇ UNVERIFIED |
| BEBodine Electric CO | Chicago | — | ◇ UNVERIFIED |
| CHCardinal Health Logistics Center | Channahon | — | ◇ UNVERIFIED |
| CTChicago Title Land Trust CO | Bloomington | — | ◇ UNVERIFIED |
| CCClimco Coils CO | Morrison | — | ◇ UNVERIFIED |
| DTDelta Technologies | Chicago | — | ◇ UNVERIFIED |
| DDor-o-matic | Harwood Heights | — | ◇ UNVERIFIED |
| E3Eleven 35 LLC | Chicago | — | ◇ UNVERIFIED |
| ECEureka CO | Bloomington | — | ◇ UNVERIFIED |
| ETExide Technologies | Kankakee | — | ◇ UNVERIFIED |
| FEFastheat Element Mfg | Elmhurst | — | ◇ UNVERIFIED |
| FCFrederick Cooper Lamps INC | Chicago | — | ◇ UNVERIFIED |
| GAGe Appliances & Lighting | Dekalb | — | ◇ UNVERIFIED |
 General Carbon | Sandwich | — | ◇ UNVERIFIED |
| GEGeneral Electric/calrod Components | Cicero | — | ◇ UNVERIFIED |
| GEGoding Electric CO | Glendale Heights | — | ◇ UNVERIFIED |
| GOGroup O Supply Chain Solutions | Milan | — | ◇ UNVERIFIED |
| HMHarris Marcus Furniture | Chicago | — | ◇ UNVERIFIED |
 Ideal Industries INC | Sycamore | — | ◇ UNVERIFIED |
| ICIllinois Central College - North Campus | Peoria | — | ◇ UNVERIFIED |
| IEIllinois Electric Works | Granite City | — | ◇ UNVERIFIED |
| ITIllinois Tool Works INC | Buffalo Grove | — | ◇ UNVERIFIED |
| IMIndustrial Motor Service | Montgomery | — | ◇ UNVERIFIED |
| IEInman Electric CO | La Salle | — | ◇ UNVERIFIED |
| IPIntegrated Power Services | Thornton | — | ◇ UNVERIFIED |
| ISItw Switches | Harwood Heights | — | ◇ UNVERIFIED |
| JCJoslyn Corporation - E a D | Franklin Park | — | ◇ UNVERIFIED |
| JMJoslyn Mfg - Electrical Apparatus Div | Chicago | — | ◇ UNVERIFIED |
| KEKinney Electrical Mfg CO | Elgin | — | ◇ UNVERIFIED |
| MIMatsushita Industrial Equipment CO (miec | Elmhurst | — | ◇ UNVERIFIED |
| MHMaytag Herrin Laundry Products | Herrin | — | ◇ UNVERIFIED |
| MMMidwest Motor Specialists | Morris | — | ◇ UNVERIFIED |
| MEMitsubishi Electric Automation INC | Vernon Hills | — | ◇ UNVERIFIED |
| MVMount Vernon Neon | Mount Vernon | — | ◇ UNVERIFIED |
| OCOneac CORP | Libertyville | — | ◇ UNVERIFIED |
| OSOsram Sylvania Products INC | Lake Zurich | — | ◇ UNVERIFIED |
| PCPanduit CORP | Burr Ridge | — | ◇ UNVERIFIED |
| PCPanduit CORP - Terminals Division | New Lenox | — | ◇ UNVERIFIED |
| PIPohlers Industrial Electric Service | Joliet | — | ◇ UNVERIFIED |
| PEPowell Electrical Systems INC | Northlake | — | ◇ UNVERIFIED |
