| IEInglot Electronics CORP | Chicago | — | ◇ 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 |
| LJL & J Technoligies | Hillside | — | ◇ UNVERIFIED |
| PCPanduit Corp-network System Div | Orland Park | — | ◇ UNVERIFIED |
| PEPowell Electrical Systems INC | Northlake | — | ◇ UNVERIFIED |
| TMTransformer Mfg INC | Norridge | — | ◇ UNVERIFIED |
| WPWeber-stephen Products CO Palatine Building 200 | Palatine | — | ◇ UNVERIFIED |
| WCWoodward Controls INC | Niles | — | ◇ UNVERIFIED |
| BWBasic Wire and Cable | Chicago | 20–99 | ◐ LIKELY ACTIVE |
| CMCath' Management INC. | Chicago | — | ◐ LIKELY ACTIVE |
| CECir/con Electrical Industries, INC. | Schaumburg | — | ◐ LIKELY ACTIVE |
| EDElectrical Division Northlake | Northlake | 100–499 | ◐ LIKELY ACTIVE |
| EAExxonmobil Advanced Graphite Solutions - Bedford Park | Bedford Park | 20–99 | ◐ LIKELY ACTIVE |
| FNF & N Supply LLC | Matteson | — | ◐ LIKELY ACTIVE |
| IPIntegrated Power Services Chicago Service Center | Chicago | 20–99 | ◐ LIKELY ACTIVE |
| KLKurtzon Lighting INC | Chicago | 20–99 | ◐ LIKELY ACTIVE |
| LNLeviton Northbrook EDSales (CARs) | Northbrook | 20–99 | ◐ LIKELY ACTIVE |
| LILittelfuse, INC. | Rosemont | — | ◐ LIKELY ACTIVE |
| OOp | Orland Park | 100–499 | ◐ LIKELY ACTIVE |
| PSPower Solutions Group | Rolling Meadows | 100–499 | ◐ LIKELY ACTIVE |
 S&C Electric Company Chicago | Chicago | 500+ | ◐ LIKELY ACTIVE |
| SGSuperior Graphite Bedford Park | Bedford Park | 20–99 | ◐ LIKELY ACTIVE |
| SASwitchboard Apparatus Inc. | Franklin Park | 100–499 | ◐ LIKELY ACTIVE |
| AGAmerican Generator & Armature CO | Lincolnwood | — | ◇ UNVERIFIED |
| ALAscor LLC | Franklin Park | — | ◇ UNVERIFIED |
| BEBemar Electric Motor Service | Chicago | — | ◇ UNVERIFIED |
| CTChicago Transit Authority | Chicago | — | ◇ UNVERIFIED |
| CEConsolidated Electronic Wire & Cable CORP. | Franklin Park | — | ◇ UNVERIFIED |
| CLCooper Lighting | Bedford Park | — | ◇ UNVERIFIED |
| CLCooper Lighting | Elk Grove Village | — | ◇ UNVERIFIED |
| CCCopar Corporation | Burbank | — | ◇ UNVERIFIED |
| EIEastland Industries INC | Hillside | — | ◇ UNVERIFIED |
| EEEmerson Electric/us Electric Motor Div Dc Motor | Chicago | — | ◇ UNVERIFIED |
| ELEsco Lighting, INC. | Niles | — | ◇ UNVERIFIED |
| EMEsco Management, LLC | Chicago | — | ◇ UNVERIFIED |
| FPFocal Point LLC | Chicago | — | ◇ UNVERIFIED |
| HPHangout Properties LLC | Chicago | — | ◇ UNVERIFIED |
| IWImi Wilshire INC | Schaumburg | — | ◇ UNVERIFIED |
| JSJmc Steel Group | Chicago | — | ◇ UNVERIFIED |
| LLLight Logic, LLC | Bellwood | — | ◇ UNVERIFIED |
| MPMBVD Properties, LLC | Broadview | — | ◇ UNVERIFIED |
| NPNXT Power, LLC | Harwood Heights | — | ◇ UNVERIFIED |
| PIPeopleworks Il LLC | Matteson | — | ◇ UNVERIFIED |
| RIResolute Industrial LLC | Wheeling | — | ◇ UNVERIFIED |
| SLSabin LLC | Chicago | — | ◇ UNVERIFIED |
| VSVolkan Signs & Lighting INC. | Schaumburg | — | ◇ UNVERIFIED |
| WOWrap on Company INC. | Alsip | — | ◇ UNVERIFIED |
