- AT&T
- Chastain & Associates
- Civiltech Engineering, Inc.
- Clark Dietz, Inc.
- DLZ
- Engineering Enterprises, Inc.
- FGM Architects
- GovHR USA
- Leopardo
- MEI - Morris Engineering, Inc.
- Metro Paramedic Services, Inc.
- Nicor Gas
- PMA Financial Network
- Power Forward DuPage
- Thomas Engineering Group
