- Aargus Security
- Access Nurses
- Adler Warehouse
- Alemite Corp.
- All Tech Inspection
- Alliance Fence
- Ambitech Engineering
- American Central Transport
- American Steel
- AMEX Construction
- Amweld International
- AMS Mechanical Systems
- Analyzer Technology Int'l
- Aqua Process
- Arctic Snow and Ice Control
- ARI Environmental
- Aurico Reports
- Baker Corp.
- Bautz Developmental Intervention
- Bijur Delimon
- Belcon Regis
- Bencor Construction
- Berlinsky Scrap
- Bestway Trucking
- Borg Mechanical Contractors
- Cabeno Environmental Field Services
- Cardinal Electric
- Carey's Small Arms Range Ventilation
- CCA Restoration
- CDL Training Service & Consulting, Inc.
- Clear Pack Company
- Chattanooga Boiler & Tank
- Clinical Collection Management
- CMC Steel Group
- Collins Engineers
- Commercial Metals Company
- Compass Environmental
- Concrete by Wagner
- Consortium Management Company
- Cooling Components
- CornProducts International
- Costpoint
- Crown Painting
- CTI Field Services
- Customwood Stairs
- Darana Electric
- Des Plains Valley Public Library District
- Diamond Construction
- DISA, Inc.
- Dresser Rand
- Duct Kleen
- Eastern Isotopes
- Enerfab
- Essex Crane
- E.T. Paddock
- Fabrication Specialties, Inc.
- Fairmont School District #89
- Falcon Transport Company
- F.E. Wheaton & Company
- FKI
- Fisk Corp.
- Flowserve US Inc.
- Fluor Corporation
- Fraley & Schilling Inc.
- Furmanite
- George's Landscaping, Inc.
- Graycor Industrial Contractors
- GYB Properties, Inc.
- Hardigg Cases
- Hasse Construction
- Hayes Mechanical
- HEATEC
- Heurty & Petro-Chem Group
- Homer Tree Service
- Horiba Instruments
- Hydro Kleen
- HydroChem
- IBEW
- Ice Mountain
- Illinois Chamber of Commerce
- Illinois Marine Towing, Inc.
- Imperial Crane
- Independent Mechanical Industries
- INDICOM
- Innovative Physicians Services
- International Tank Services
- International Titanium Powder
- Interstate Scaffolding
- Iron Workers JATC Local 444
- International Union of Operating Engineers Local 150
- JWP/Hyre Electric
- Kaleidoscope
- Kraemer Gunite Inc.
- La Grange Glass & Mirror
- Len Cox & Sons Excavating
- Lockport Township Park District
- Lombart Instrument
- Luse Companies
- Macsteel Service Centers
- Maertin Heating & Cooling
- Mar Theatre
- Matrix Service Company
- Meade Electric
- MEDTOX
- Midwest Services
- Millard Group
- Mistras Group, Inc.
- M.J. Fogarty & Associates
- MKD Electric
- Modern Builders Industrial Construction
- Molter Corporation
- Moreland International
- Morrison Construction
- Morrison Survey
- Murphy
- Newtron Group
- Nooter Construction
- Northern Pipeline
- NPL Construction
- ONYX
- Parkway Imaging
- Pasch & Sons Construction
- Phillips Getschow Co.
- Pipeline Testing Consortium, Inc.
- Plumbers & Pipefitters Local 422
- Polaris Engineering
- Praxair
- Prit Service
- Pullara Construction
- Rackit Material
- Raymond Professional Group
- RBD Technical
- Red Eye Aerospace
- Rescar
- Resource Managment Companies
- Ritter Technology
- Safway Scaffolds
- Satellite Industries
- Scheck Mechanical
- Scotty's of Will County
- Service Tool International
- Shared Systems Technology
- Sharp Bullet Resistant Products, Inc.
- Sterling Testing Systems
- ST Piping
- Stan's Landscaping
- Starcon International
- Structural Preservation Systems
- Superior Crane
- TCI Services, Inc.
- TDW Services
- T.J. Lambrecht
- TMP Hudson Global Services
- Total Environmental Services
- Tote Detailing
- TriHydro Corporation
- Tri-State Scale Systems
- Tri-Tech Electric
- T & S Auto Recycling
- Turnaround Management Company
- Turner Industries Group
- Two Brothers Trucking
- United Anco
- UOP
- Valdes Engineering Co.
- Viking Driving School
- V.J. Mattson
- Vulcan Materials Co.
- Williams Fire & Hazard Control
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