| | Company | | Members | |
| | Shure Incorporated | | 10 |
| | Andrew Corporation | | 5 |
| | Sara Lee Corporation | | 5 |
| | West Monroe Partners | | 5 |
| | Conxall Corporation | | 4 |
| | Zebra Technologies | | 4 |
| | ACCO Brands Corporation | | 4 |
| | Stepan Company | | 4 |
| | Dentsply International - Profe | | 4 |
| | Hollister Incorporated | | 3 |
| | International Truck and Engine | | 3 |
| | Abbott Laboratories | | 3 |
| | United States Gypsum Corporati | | 3 |
| | Oracle Corporation | | 3 |
| | Siemens Medical Systems | | 3 |
| | Abbott Molecular Inc | | 3 |
| | The Parksite Group | | 3 |
| | Clarke Mosquito Control | | 3 |
| | Motorola Incorporated | | 2 |
| | Kellogg Company | | 2 |
| | Siemens Building Technologies | | 2 |
| | Kraft Foods | | 2 |
| | NuFarm Americas Inc | | 2 |
| | Motorola Inc | | 2 |
| | Nation Pizza Products | | 2 |
| | Sara Lee | | 2 |
| | Prefection Spring & Stamping | | 2 |
| | North American Corporation | | 2 |
| | PCTEL Antena Products Group | | 2 |
| | Parker Hannifin | | 2 |
| | GE Healthcare | | 2 |
| | M. Holland Company | | 2 |
| | Dean Foods Company | | 2 |
| | Abbott Labs | | 2 |
| | Allegiance Healthcare | | 2 |
| | Arrow Electronics | | 2 |
| | Astellas US Technologies, Inc. | | 2 |
| | Atlas Material Testing Technol | | 2 |
| | Baxter Healthcare Corporation | | 2 |
| | Blistex Inc. | | 2 |
| | Blistex Incorporated | | 2 |
| | HAVI Global Solutions | | 2 |
| | CROWN IMPORTS LLC | | 2 |
| | Integrated Project Management | | 2 |
| | Deluxe Corporation | | 2 |
| | Eagle Test Systems | | 2 |
| | Ecolab | | 2 |
| | Electro Motive Division of GMC | | 2 |
| | Electro-Motive Diesels | | 2 |
| | Elkay Manufacturing Company | | 2 |
| | Kraft Foods Incorporated | | 2 |
| | Gold Eagle Company | | 2 |
| | Hollister | | 2 |
| | Borg Warner | | 2 |
| | Uline Inc | | 2 |
| | Zebra Technologies Corporation | | 2 |
| | Videojet Technologies Inc. | | 1 |
| | DEUBLIN COMPANY | | 1 |
| | Diageo | | 1 |
| | E.ON Climate & Renewables | | 1 |
| | E2Open | | 1 |
| | W.W. Grainger | | 1 |
| | Eaton Corporation | | 1 |
| | KPMG LLP | | 1 |
| | Electro Motive Diesel | | 1 |
| | DENTSPLY | | 1 |
| | Vibro/Dynamics Corp | | 1 |
| | Velsicol Chemical Corporation | | 1 |
| | Emerging Solutions | | 1 |
| | Ernst & Young L.L.P. | | 1 |
| | Ernst & Young LLP | | 1 |
| | ETS-Lindgren | | 1 |
| | Exel | | 1 |
| | W.R. Grace | | 1 |
| | D & R Enterprises LLC | | 1 |
| | Conectec RF | | 1 |
| | Wm Wrigley Jr Co | | 1 |
| | Coyote Logistics | | 1 |
| | Crane Composites Inc | | 1 |
| | Crowe Howrath LLT | | 1 |
| | Crowe Horwath LLP | | 1 |
| | Winpak Portion Packaging | | 1 |
| | DePaul University | | 1 |
| | Cummins Allison | | 1 |
| | W.W. Grainger, Inc. | | 1 |
| | DARC Corporation | | 1 |
| | DCS Management | | 1 |
| | De Laval Mfg | | 1 |
| | William Frick & Company | | 1 |
| | Deloitte Consulting | | 1 |
| | Wheatland Tube Company | | 1 |
| | Federal-Mogul Corporation | | 1 |
| | CSXT | | 1 |
| | Homax Holdings Inc. | | 1 |
| | H J Heinz Co of Canada Ltd | | 1 |
| | Hadady Corporation | | 1 |
| | Haemoscope Corporation | | 1 |
| | Hansen Technologies Corp | | 1 |
| | Hart Schaffner & Marx | | 1 |
| | Vector Tobacco | | 1 |
| | Hersher Consultants | | 1 |
| | ExxonMobil Corporation | | 1 |
| | US Fujitsu Consulting | | 1 |
| | Graymills Corporation | | 1 |
| | Hospira Inc | | 1 |
| | Hu-Friedy | | 1 |
| | Hu-Friedy Mfg Co | | 1 |
| | IBM Business Consulting Servic | | 1 |
| | IBM Global Business Services | | 1 |
| | Icon Identity Solutions | | 1 |
| | iCONN Systems | | 1 |
| | US Tsubaki | | 1 |
| | Velocity Business Sollutions | | 1 |
| | Communications Test Design Inc | | 1 |
| | Federated Group/Golden Bay | | 1 |
| | Flavorchem Corporation | | 1 |
| | Fluid Management L P | | 1 |
| | Focal Point Lights | | 1 |
| | Fonterra USA | | 1 |
| | FUJIFILM Graphic Systems USA, | | 1 |
| | GTM Consulting | | 1 |
| | GC America | | 1 |
| | Griffith Laboratories | | 1 |
| | Genesis Packaging & Design | | 1 |
| | Vehicle Improvement Products I | | 1 |
| | Good Earth Lighting Inc. | | 1 |
| | Goodrich ISR Systems | | 1 |
| | Grainger | | 1 |
| | Grant Thornton LLP | | 1 |
| | Grayhill Incorporated | | 1 |
| | faip north america | | 1 |
| | Gam Gear LLC | | 1 |
| | Avnet Electronics | | 1 |
| | ANI Safety & Supply Inc | | 1 |
| | Apollo Supply Chain, LLC | | 1 |
| | Appetizers And Inc | | 1 |
| | WW Grainger Incorporated | | 1 |
| | WT Russell Ltd | | 1 |
| | AT&T | | 1 |
| | WR Grace | | 1 |
| | Berry Plastics | | 1 |
| | Avery Denison | | 1 |
| | AMCO Engineering Company | | 1 |
| | Avon Products Inc | | 1 |
| | Baker Tilly | | 1 |
| | Barilla America Inc | | 1 |
| | Barry Callebaut | | 1 |
| | Baxter Healthcare | | 1 |
| | World's Finest Chocolate Inc | | 1 |
| | Concentric Incorporated | | 1 |
| | Automotion Incorporated | | 1 |
| | Ace Hardware | | 1 |
| | Abbott Laboratories Internatio | | 1 |
| | ZF Industries Incorporated | | 1 |
| | Abbott Vascular | | 1 |
| | ABN AMRO Bank N.V. | | 1 |
| | Accenture | | 1 |
| | Accenture LLP | | 1 |
| | Accenture Procurement Solution | | 1 |
| | Yaskawa Electric America | | 1 |
| | Zanett | | 1 |
| | Amsted Rail Company | | 1 |
| | ACE Hardware Paint Division | | 1 |
| | ACME Industries Inc | | 1 |
| | Adams Magnetic Products Co | | 1 |
| | AKZO Nobel Chemicals LLC | | 1 |
| | Alberto Culver | | 1 |
| | Aldea Technologies Inc | | 1 |
| | Yeomans Chicago Corporation | | 1 |
| | Beyer Business Solutions Inc | | 1 |
| | ACCO Brands | | 1 |
| | Chicago Transit Authority | | 1 |
| | CE Niehoff & Co | | 1 |
| | Celerant Consulting | | 1 |
| | Center for Professional Mgt | | 1 |
| | Center of Excellence | | 1 |
| | CFC International | | 1 |
| | CH Robinson - TMC | | 1 |
| | Chemtech Plastics Inc | | 1 |
| | Bel Brands USA | | 1 |
| | Chicago Scenic Studios | | 1 |
| | Castle Metals | | 1 |
| | Cinch Connectors | | 1 |
| | city of chicago | | 1 |
| | City of Evanston | | 1 |
| | WM Wrigley Jr Company | | 1 |
| | CME | | 1 |
| | Coleman Cable Incorporated | | 1 |
| | Imbibe | | 1 |
| | Chicago Rawhide | | 1 |
| | Cabot Microelectronics Corp | | 1 |
| | Bivona Medical Technology | | 1 |
| | World Kitchen Incorporated | | 1 |
| | World Kitchen | | 1 |
| | Woods Equipment Co | | 1 |
| | Bowe Bell + Howell | | 1 |
| | BP Americas Inc | | 1 |
| | Braeside Displays | | 1 |
| | CDW Logistics | | 1 |
| | Buker Inc | | 1 |
| | Caterpillar | | 1 |
| | Cadent Resources | | 1 |
| | Cambridge Technology Partners | | 1 |
| | Capgemini US LLC | | 1 |
| | Cardinal Health | | 1 |
| | Caremark | | 1 |
| | Caremark PSD | | 1 |
| | Carl Buddig & Company | | 1 |
| | Compass Business Solutions | | 1 |
| | BSI Consulting Inc | | 1 |
| | Rexnord Seal Operation | | 1 |
| | IFS Industrial & Financial Sys | | 1 |
| | Quickset International | | 1 |
| | R. S. Owens | | 1 |
| | Radio Flyer Inc | | 1 |
| | Radionic Industries, Inc. | | 1 |
| | Rauland-Borg Corporation | | 1 |
| | Republic Systems | | 1 |
| | QAD | | 1 |
| | Rexam Beverage Can | | 1 |
| | Printpack Inc | | 1 |
| | Riddell, Inc. | | 1 |
| | Rixson | | 1 |
| | Robert Bosch Corporation | | 1 |
| | Robert Bosch Tool Corporation | | 1 |
| | Romane Fragrances LLC | | 1 |
| | Rotary International | | 1 |
| | RR Donnelley | | 1 |
| | Revell-Monogram Incorporated | | 1 |
| | PharmTech, Inc. | | 1 |
| | Panasonic Factory Solutions Co | | 1 |
| | Panduit Corporation | | 1 |
| | Trelleborg Sealing Solutions | | 1 |
| | Parker Hannifin Corporation | | 1 |
| | Transilwrap Company Inc | | 1 |
| | Peddinghaus Corporation | | 1 |
| | PEER Bearing Group | | 1 |
| | QAD Incorporated | | 1 |
| | Pepsico | | 1 |
| | Rust-Oleum Corporation | | 1 |
| | Plan for Excellence, Inc. | | 1 |
| | Plexus | | 1 |
| | Power Parts | | 1 |
| | Toyal America, Inc | | 1 |
| | Preferred Meal Systems | | 1 |
| | PricewaterhouseCoopers | | 1 |
| | PricewaterhouseCoopers LLP | | 1 |
| | PeopleSoft Incorporated | | 1 |
| | SSA Global | | 1 |
| | Siemens Medical Solutions | | 1 |
| | The Faucet Queens Inc | | 1 |
| | Smiths Medical | | 1 |
| | Smurfit Stone Container Corp | | 1 |
| | Solo Cup | | 1 |
| | Solo Cup Company | | 1 |
| | Sonoco | | 1 |
| | RR Donnelley Logistics | | 1 |
| | Square D Company | | 1 |
| | Siemens | | 1 |
| | Standard Parking | | 1 |
| | The Edlong Co | | 1 |
| | Storck USA, LP | | 1 |
| | Telephone & Data Systems | | 1 |
| | Tempel Steel Motor Division | | 1 |
| | Tenneco | | 1 |
| | The City of Wheaton | | 1 |
| | SourceAlign Inc. | | 1 |
| | Schneider Electric | | 1 |
| | OSG Tap & Die Inc | | 1 |
| | Sanford Corporation | | 1 |
| | SAP | | 1 |
| | SAP America | | 1 |
| | SAP America, Inc. | | 1 |
| | TNH, Inc | | 1 |
| | Sara Lee Coffee & Tea | | 1 |
| | Siemens Healthcare Diagnostics | | 1 |
| | Schindler Elevator Corporation | | 1 |
| | Thomson Reuters | | 1 |
| | Scholle Corporation | | 1 |
| | Schwarz | | 1 |
| | Sencon Inc | | 1 |
| | SHK Partners | | 1 |
| | Shure | | 1 |
| | TimeMed Labeling Systems | | 1 |
| | SIBC Corporation | | 1 |
| | RSM McGladrey, Inc | | 1 |
| | TLG | | 1 |
| | LaMarsh & Associates | | 1 |
| | Kenall Manufacturing Co. | | 1 |
| | Kerry Sweet | | 1 |
| | KI Industries Inc | | 1 |
| | Kneisel Industries Inc | | 1 |
| | Knowles Electronics LLC | | 1 |
| | Unisource Supply Systems | | 1 |
| | Unilever IT North America | | 1 |
| | Magid Glove & Safety | | 1 |
| | L3 ELECTRODYNAMICS | | 1 |
| | JohnsonDiversey | | 1 |
| | Lindgren RF Enclosure Inc | | 1 |
| | Little Lady Foods | | 1 |
| | LXE | | 1 |
| | M. Gartner Consulting | | 1 |
| | Unilever | | 1 |
| | MacLean Power Systems | | 1 |
| | Pactiv Corporation | | 1 |
| | ZF Sales & Service NA, LLC | | 1 |
| | ISP3 USA | | 1 |
| | The Donas Group Inc | | 1 |
| | IMC Holdings Incorporated | | 1 |
| | Improvement Is People | | 1 |
| | Independent Consultant | | 1 |
| | Indiana University - Bloomingt | | 1 |
| | Infor | | 1 |
| | Integrated Business Plannining | | 1 |
| | Kenall Manufacturing | | 1 |
| | United Parcel Service | | 1 |
| | United Airlines | | 1 |
| | ITT | | 1 |
| | ITT Bell & Gossett | | 1 |
| | ITT Industries | | 1 |
| | ITT McDonnell & Miller | | 1 |
| | JCB SCM Solutions | | 1 |
| | Jockey International Inc | | 1 |
| | Johnson Controls Inc | | 1 |
| | Market Track | | 1 |
| | University of Chicago | | 1 |
| | Tru Vue | | 1 |
| | National Cycle Incorporated | | 1 |
| | Nationwide Transportation | | 1 |
| | Navistar Inc. | | 1 |
| | Nissan Forklift Corporation NA | | 1 |
| | Norman Equipment Company | | 1 |
| | North American Co. | | 1 |
| | Turtle Wax Incorporated | | 1 |
| | MacLean Vehicle Systems | | 1 |
| | Northrop Grumman Corporation | | 1 |
| | n/a | | 1 |
| | Numetrix Incorporated | | 1 |
| | NZL Consulting LLC | | 1 |
| | Opto International | | 1 |
| | Oracle | | 1 |
| | Oracle America Inc | | 1 |
| | Tripp Lite | | 1 |
| | IL ARMY NATIONAL GUARD | | 1 |
| | Northern Trust | | 1 |
| | MJ Celco Inc | | 1 |
| | Master Lock Company | | 1 |
| | McCain Foods USA, Inc. | | 1 |
| | McGladrey & Pullen LLP | | 1 |
| | McHenry County College | | 1 |
| | McIntyre Group Ltd. | | 1 |
| | Middlepath Consulting | | 1 |
| | Midtronics, Inc. | | 1 |
| | UGN, Inc. | | 1 |
| | MITS Inc | | 1 |
| | Nabisco | | 1 |
| | MK Packaging | | 1 |
| | Molex | | 1 |
| | Morton Grove Phar | | 1 |
| | Motor Coach Industries | | 1 |
| | Unemployed | | 1 |
| | MSC Engineered Materials & Sol | | 1 |
| | N E S | | 1 |
| | Ostrow Reisin Berk & Abrams Lt | | 1 |
| | Millipore | | 1 |
