- 3Com Corporation
- 3M
- Abbott Laboratories
- Accenture
- Albany Chicago Company
- Alliant Credit Union
- Allstate Insurance
- Aon Corporation
- AT&T
- Avon Products
- Baxter Healthcare
- Bison Gear & Engr
- BlueCross BlueShield
- Bodine Electric Company
- Cardinal Health
- Caterpillar
- Cessna Citation X Line
- Chamberlain Group
- Charles Industries
- Chicago Board Options Exchange
- Commonwealth Edison
- Computer Sciences Corp.
- Continental Automotive Systems
- CTS Corporation
- D&R Technology LLC
- Danaher - Kavo Dental Corp
- Danaher/Gendex
- Daugherty Business Solutions
- Deere & Co.
- Delphi Automotive Systems
- Delta T Construction
- Dentsply Professional
- Descon Engineering Ltd.
- Dreyer's Grand Ice Cream
- DuPage Precision Product
- Echo Global Logistics
- EDO-NexGen
- Elkay Manufacturing Co.
- Emerson Process Management
- Executive Construction Inc.
- Federal Reserve Bank
- Fermi National Accelerator Labs
- Flexible Steel Lacing Co.
- Focal Communications
- Ford Motor Company
- Freddie Mac
- Freescale Semiconductor, Inc
- GE Healthcare
- GE Medical Systems
- General Motors
- Hamilton Sundstrand
- Heuft USA
- Hewitt Associates
- Hospira, Inc.
- International Truck & Engine Corp.
- ITT Industries, Inc.
- ITW Hi-Cone
- John Crane, Inc.
- Klein Tools, Inc.
- Komatsu America Corp.
- Kraft Foods, Inc.
- Littelfuse, Inc.
- Littell International Inc.
- Maverick Tube Corporation
- Merchants Metals
- Merkle-Korff Industries, Inc.
- Metropolitan Water Reclamation Dist. Chicago
- Microchip Technology
- Monsanto - G.D. Searle Co.
- Morey Corp.
- Motorola, Inc.
- Nabisco
- Nalco Chemical
- NanoInk, Inc.
- National Organization for Research NORC
- NAVIGON
- Netcom
- Northrop Grumman
- NUM Corporation
- Open Air/A NetSuite Company
- Open TV Inc.
- Packet Video, Inc.
- Panduit Corporation
- Parker Hannifin Corp.
- PEC North America Inc.
- Pentair Water Treatment
- Precision Castparts Corp.
- Premier International
- Prince Industries
- Ricardo, Inc.
- Robert Bosch Tool Corp.
- Rockwell Automation
- Rohde & Schwarz
- Rohm & Haas Co.
- S&C Electric Company
- Sargent & Lundy
- SBC/Ameritech
- Schering-Plough
- Schreiber Foods
- Searle/Monsanto
- Shure, Inc.
- Siemens AG
- Snap-On Tools
- Summit Industries
- The Nielsen Co.
- Thirdwave, LLC
- T-Mobile USA
- Tropicana
- Turner Construction Co.
- U.S. Navy
- U.S. Army
- Underwriters Laboratories
- Uniqema
- United Airlines
- UOP
- USG
- Valdes Engineering Co.
- Visteon
- Wm. Wrigley Jr. Company
- WMS Gaming
