| | Company | | Members | |
| | Shure Incorporated | | 11 |
| | Stepan Company | | 6 |
| | American Fluorescent Corp | | 5 |
| | Atkore International | | 4 |
| | Andrew Corporation | | 3 |
| | Kraft Foods | | 3 |
| | Hollister Incorporated | | 3 |
| | GE Energy | | 3 |
| | Dresser | | 3 |
| | Cardinal Health | | 3 |
| | The Parksite Group | | 3 |
| | Dean Foods Company | | 3 |
| | Sara Lee Corporation | | 3 |
| | Zebra Technologies Corporation | | 3 |
| | Arrow Electronics | | 2 |
| | Clarke Mosquito Control | | 2 |
| | Uline Inc | | 2 |
| | Gold Eagle Company | | 2 |
| | Astellas US Technologies, Inc. | | 2 |
| | Pepsico | | 2 |
| | Nation Pizza Products | | 2 |
| | Parker Hannifin | | 2 |
| | GE Healthcare | | 2 |
| | Oracle Corporation | | 2 |
| | Conxall Corporation | | 2 |
| | Zebra Technologies | | 2 |
| | Deluxe Corporation | | 2 |
| | Abbott Laboratories | | 2 |
| | Yaskawa Electric America | | 2 |
| | Siemens Medical Systems | | 2 |
| | Klein Tools | | 2 |
| | Eagle Test Systems | | 2 |
| | Rich Products | | 2 |
| | AmerisourceBergen Technology G | | 2 |
| | Integrated Project Management | | 2 |
| | Blistex Inc. | | 2 |
| | Siemens Healthcare Diagnostics | | 2 |
| | Alberto Culver | | 2 |
| | Prefection Spring & Stamping | | 2 |
| | HAVI Global Solutions | | 2 |
| | West Monroe Partners | | 2 |
| | faip north america | | 1 |
| | FedEx Ground | | 1 |
| | ExxonMobil Corporation | | 1 |
| | Ecolab | | 1 |
| | DePaul University | | 1 |
| | DEUBLIN COMPANY | | 1 |
| | DHL Global Forwarding | | 1 |
| | Diageo | | 1 |
| | Dover Corporation | | 1 |
| | E.ON Climate & Renewables | | 1 |
| | Elkay Manufacturing Company | | 1 |
| | Eby-Brown Co | | 1 |
| | Exopack | | 1 |
| | Electro Motive Diesel | | 1 |
| | Emerson Climat Tech | | 1 |
| | Emmi-Roth Kase USA, Ltd. | | 1 |
| | Ernst & Young LLP | | 1 |
| | ETS-Lindgren | | 1 |
| | Exel Inc. | | 1 |
| | E2Open | | 1 |
| | Independent | | 1 |
| | Global Recuiters Old Orchard | | 1 |
| | Hu-Friedy | | 1 |
| | IBM Global Business Services | | 1 |
| | Icon Identity Solutions | | 1 |
| | IFS Industrial & Financial Sys | | 1 |
| | IMC Holdings Incorporated | | 1 |
| | Hollister | | 1 |
| | Improvement Is People | | 1 |
| | Hersher Consultants | | 1 |
| | Infor | | 1 |
| | Integrated Business Plannining | | 1 |
| | International Truck and Engine | | 1 |
| | Intrigo Systems | | 1 |
| | INX Internation Ink Co | | 1 |
| | JCB SCM Solutions | | 1 |
| | Jernberg | | 1 |
| | IMEC | | 1 |
| | Grainger | | 1 |
| | Fonterra USA | | 1 |
| | Fonterra, USA | | 1 |
| | Freudenberg Household Products | | 1 |
| | GAM Enterprises Inc | | 1 |
| | Gam Gear LLC | | 1 |
| | Global Associates LTD. | | 1 |
| | Hospira Inc | | 1 |
| | GPA | | 1 |
| | Focal Point Lights | | 1 |
| | Grayhill Incorporated | | 1 |
| | GTM Consulting | | 1 |
| | Hadady Corporation | | 1 |
| | Hallberg Management Consulting | | 1 |
| | Hansen Technologies Corp | | 1 |
| | Harpo | | 1 |
| | Hart Schaffner & Marx | | 1 |
| | Goodrich ISR Systems | | 1 |
| | Atkore | | 1 |
| | Appetizers And Inc | | 1 |
| | Applied Productivity | | 1 |
| | Archstone Consultant | | 1 |
| | Argo, Inc | | 1 |
| | Arpac LP | | 1 |
| | ASSA ABLOY - Rixson | | 1 |
| | Beam Global | | 1 |
| | AT&T | | 1 |
| | Amsted Rail Company | | 1 |
| | Atkore Internatinal | | 1 |
| | Automotion Incorporated | | 1 |
| | Avnet Electronics | | 1 |
| | Bankier Companies, Inc | | 1 |
| | Barilla America Inc | | 1 |
| | Baxter Healthcare | | 1 |
| | CME | | 1 |
| | Astellas US Technologies | | 1 |
| | ACE Hardware Paint Division | | 1 |
| | Abbott Lab | | 1 |
| | Abbott Labs | | 1 |
| | Abbott Molecular Inc | | 1 |
| | ABN AMRO Bank N.V. | | 1 |
| | Accenture | | 1 |
| | ACCO Brands | | 1 |
| | ACCO Brands Corporation | | 1 |
| | Anixter | | 1 |
| | Ace Hardware | | 1 |
| | ANI Safety & Supply Inc | | 1 |
| | ACME Industries Inc | | 1 |
| | adam travel | | 1 |
| | AkzoNobel | | 1 |
| | Alberto Culver USA | | 1 |
| | Aldea Technologies Inc | | 1 |
| | Allegiance Healthcare | | 1 |
| | Belnic Systesm L.P. | | 1 |
| | ACCO Brands Inc | | 1 |
| | Cognis | | 1 |
| | CFC International | | 1 |
| | Chemtech Plastics Inc | | 1 |
| | Chicago Rawhide | | 1 |
| | Chicago Scenic Studios | | 1 |
| | Chiquita Brands International | | 1 |
| | Cinch Connectors | | 1 |
| | Baxter Healthcare Corporation | | 1 |
| | Jockey International Inc | | 1 |
| | Celerant Consulting | | 1 |
| | CommScope | | 1 |
| | Compass Business Solutions | | 1 |
| | Concentric Incorporated | | 1 |
| | Corporate Safe Specialists | | 1 |
| | Coyote Logistics | | 1 |
| | Crowe Howrath LLT | | 1 |
| | DARC Corporation | | 1 |
| | city of chicago | | 1 |
| | Capgemini US LLC | | 1 |
| | Beyer Business Solutions Inc | | 1 |
| | Biomet, Inc. | | 1 |
| | Bivona Medical Technology | | 1 |
| | Blachford, Inc | | 1 |
| | Blistex Incorporated | | 1 |
| | Borg Warner | | 1 |
| | Bowe Bell + Howell | | 1 |
| | Center of Excellence | | 1 |
| | Cadent Resources | | 1 |
| | Center for Professional Mgt | | 1 |
| | Caremark PSD | | 1 |
| | Carl Buddig & Company | | 1 |
| | Catalyst Solutions LLC | | 1 |
| | Caterpillar | | 1 |
| | Caterpillar Inc | | 1 |
| | CE Niehoff & Co | | 1 |
| | DCS Management | | 1 |
| | Braeside Displays | | 1 |
| | SSA Global | | 1 |
| | The Faucet Queens Inc | | 1 |
| | Sloan Valve Company | | 1 |
| | Smiths Medical | | 1 |
| | Smurfit Stone | | 1 |
| | Smurfit Stone Container Corp | | 1 |
| | Solo Cup | | 1 |
| | Solo Cup Company | | 1 |
| | Siemens Medical Solutions USA, | | 1 |
| | Square D Company | | 1 |
| | Siemens Industry Inc. | | 1 |
| | Standard Parking | | 1 |
| | Steiner Industries | | 1 |
| | Storck USA, LP | | 1 |
| | T&B Tube Company Incorporated | | 1 |
| | Telephone & Data Systems | | 1 |
| | Tempel Steel Motor Division | | 1 |
| | Kraft Foods Incorporated | | 1 |
| | Sonoco | | 1 |
| | Sara Lee | | 1 |
| | RQA, Inc. | | 1 |
| | RR DONNELLEY | | 1 |
| | RR Donnelley Logistics | | 1 |
| | Rust-Oleum Corporation | | 1 |
| | Saint Xavier University | | 1 |
| | Sanford Corporation | | 1 |
| | SAP / Navigator | | 1 |
| | skinnyCorp | | 1 |
| | SAP America, Inc. | | 1 |
| | Thomson Reuters | | 1 |
| | Sara Lee Coffee & Tea | | 1 |
| | Scholle Corporation | | 1 |
| | Schwarz | | 1 |
| | Sencon Inc | | 1 |
| | Shure | | 1 |
| | SIBC Corporation | | 1 |
| | Siemens Building Technologies | | 1 |
| | SAP America | | 1 |
| | WR Grace | | 1 |
| | The City of Wheaton | | 1 |
| | Wheatland Tube Company | | 1 |
| | William Frick & Company | | 1 |
| | Winpak Portion Packaging | | 1 |
| | Wipfli LLP | | 1 |
| | WM Wrigley Jr Company | | 1 |
| | WorkforceLogic | | 1 |
| | W.W. Grainger, Inc. | | 1 |
| | World's Finest Chocolate Inc | | 1 |
| | W.W. Grainger | | 1 |
| | WT Russell Ltd | | 1 |
| | WW Grainger Incorporated | | 1 |
| | X-L Eng. Corp. | | 1 |
| | Xylem | | 1 |
| | Xylem Inc. | | 1 |
| | Yeomans Chicago Corporation | | 1 |
| | Young Innovations | | 1 |
| | World Kitchen Incorporated | | 1 |
| | United States Gypsum Corporati | | 1 |
| | TimeMed Labeling Systems | | 1 |
| | TMC | | 1 |
| | TNH, Inc | | 1 |
| | Toyal America, Inc | | 1 |
| | Transilwrap Company Inc | | 1 |
| | Unilever | | 1 |
| | Unilever IT North America | | 1 |
| | Westwind International | | 1 |
| | United Airlines | | 1 |
| | Rogan Corporation | | 1 |
| | UOP a Honeywell Company | | 1 |
| | US Fujitsu Consulting | | 1 |
| | Vehicle Improvement Products I | | 1 |
| | Velocity Business Sollutions | | 1 |
| | Vibro/Dynamics Corp | | 1 |
| | Videojet Technologies Inc. | | 1 |
| | Visular | | 1 |
| | Unisource Supply Systems | | 1 |
| | Nabisco | | 1 |
| | Rovelka of Illinois, Inc. | | 1 |
| | Menlo Worldwide | | 1 |
| | Merisant | | 1 |
| | MillerCoors | | 1 |
| | Mobile Mark Inc | | 1 |
| | Motor Coach Industries | | 1 |
| | Motorola Inc | | 1 |
| | MEA INC | | 1 |
| | N E S | | 1 |
| | McIntyre Group Ltd. | | 1 |
| | Nano Ink Inc | | 1 |
| | Navistar | | 1 |
| | New Resources Corporation | | 1 |
| | Nippon Express USA, Inc. | | 1 |
| | Norman Equipment Company | | 1 |
| | North American Corporation | | 1 |
| | Northern Trust | | 1 |
| | Motorola Incorporated | | 1 |
| | Leggett & Platt Global Service | | 1 |
| | Johnson Controls, Inc. | | 1 |
| | Kellogg Company | | 1 |
| | Kenall Manufacturing | | 1 |
| | Knowles | | 1 |
| | Kraft | | 1 |
| | AB InBev | | 1 |
| | L3 ELECTRODYNAMICS | | 1 |
| | Medela | | 1 |
| | LaMarsh & Associates | | 1 |
| | NZL Consulting LLC | | 1 |
| | Little Lady Foods | | 1 |
| | LXE | | 1 |
| | M. Gartner Consulting | | 1 |
| | MacLean Power Systems | | 1 |
| | McCain Foods USA, Inc. | | 1 |
| | McGladrey & Pullen LLP | | 1 |
| | McHenry County College | | 1 |
| | ZF Industries Incorporated | | 1 |
| | Radionic Industries, Inc. | | 1 |
| | Printpack Inc | | 1 |
| | PRTM | | 1 |
| | PureCircle USA | | 1 |
| | QAD | | 1 |
| | QAD Inc Chicago | | 1 |
| | Quickset International | | 1 |
| | R Carman Consulting | | 1 |
| | NuFarm Americas Inc | | 1 |
| | Rackspace Hosting | | 1 |
| | Precision Metal Crafters, Inc. | | 1 |
| | Randy Reizman | | 1 |
| | Revell-Monogram Incorporated | | 1 |
| | Rexnord Seal Operation | | 1 |
| | Riddell, Inc. | | 1 |
| | Robert Bosch Corporation | | 1 |
| | Robert Bosch Tool Corporation | | 1 |
| | Johnson Controls Inc | | 1 |
| | R. S. Owens | | 1 |
| | PEER Bearing Group | | 1 |
| | Romane Fragrances LLC | | 1 |
| | Opto International | | 1 |
| | OPTO International, Inc. | | 1 |
| | Oracle | | 1 |
| | Pactiv | | 1 |
| | Pactiv Corporation | | 1 |
| | Parker Hannifin Corporation | | 1 |
| | PricewaterhouseCoopers LLP | | 1 |
| | Peddinghaus Corporation | | 1 |
| | Preferred Meal Systems | | 1 |
| | PharmTech, Inc. | | 1 |
| | Phonak | | 1 |
| | Phonak LLC | | 1 |
| | Plan for Excellence, Inc. | | 1 |
| | Plexus | | 1 |
| | Potash Corp | | 1 |
| | Power Parts | | 1 |
| | Numetrix Incorporated | | 1 |
| | PCTEL Antena Products Group | | 1 |
