| | Company | | Members | |
| | Sealed Air Corporation (US) | | 14 |
| | Electro Motive Division of GMC | | 9 |
| | Shure Incorporated | | 8 |
| | Stepan Company | | 8 |
| | ACCO Brands Corporation | | 6 |
| | Hollister Incorporated | | 5 |
| | Siemens Building Technologies | | 4 |
| | Solo Cup Company | | 4 |
| | Borg Warner | | 4 |
| | Blistex Incorporated | | 4 |
| | Behr Process Corporation | | 4 |
| | Kraft Foods Incorporated | | 4 |
| | PricewaterhouseCoopers LLP | | 4 |
| | Int'l Truck and Engine | | 4 |
| | Ecolab | | 3 |
| | Sara Lee Corporation | | 3 |
| | Motorola Incorporated | | 3 |
| | Abbott Molecular Inc | | 3 |
| | SAP America | | 3 |
| | GE Healthcare | | 3 |
| | Dade Behring Incorporated | | 3 |
| | Carl Buddig & Company | | 3 |
| | Cardinal Health | | 3 |
| | HAVI Global Solutions | | 3 |
| | Corn Products International | | 3 |
| | Ace Hardware Corporation | | 3 |
| | Oracle Corporation | | 3 |
| | ZF Sales & Service NA, LLC | | 3 |
| | SPX Filtran | | 2 |
| | Robert Bosch Corporation | | 2 |
| | Velocity Business Sollutions | | 2 |
| | NuFarm Americas Inc | | 2 |
| | Elkay Manufacturing Company | | 2 |
| | Wells Gardner Electronics Co | | 2 |
| | RSM McGladrey | | 2 |
| | CE Niehoff & Co | | 2 |
| | Allegiance Healthcare | | 2 |
| | Sanford Corporation | | 2 |
| | Electro Motive Diesel | | 2 |
| | Juno Lighting Group | | 2 |
| | Integrated Project Management | | 2 |
| | Master Lock Company | | 2 |
| | DeVry University | | 2 |
| | ExxonMobil Corporation | | 2 |
| | Gam Gear LLC | | 2 |
| | Electro-Motive Diesel | | 2 |
| | Smurfit Stone Container Corp | | 2 |
| | Plexus | | 2 |
| | Sara Lee Coffee & Tea | | 2 |
| | WW Grainger Incorporated | | 2 |
| | Prefection Spring & Stamping | | 2 |
| | Clarke Mosquito Control | | 2 |
| | Sears Holdings | | 2 |
| | ZF Industries Incorporated | | 2 |
| | Nation Pizza Products | | 2 |
| | Schindler Elevator Corporation | | 2 |
| | Scholle Packaging | | 2 |
| | SSA Global | | 2 |
| | Parker Hannifin | | 2 |
| | Pepsico | | 2 |
| | Hospira Inc | | 2 |
| | Griffith Laboratories | | 2 |
| | Hart Schaffner & Marx | | 2 |
| | Littelfuse Incorporated | | 2 |
| | Hu-Friedy Mfg Co | | 2 |
| | Vibro/Dynamics Corp | | 2 |
| | Paratech Incorporated | | 2 |
| | Focal Point Lights | | 2 |
| | Liquid Packaging, LLC | | 2 |
| | Aquion Partners LP | | 2 |
| | Dean Foods Company | | 2 |
| | Appetizers And Inc | | 2 |
| | Videojet Systems International | | 2 |
| | Deluxe Corporation | | 2 |
| | PCTEL Antena Products Group | | 2 |
| | Abbott Laboratories | | 2 |
| | Empire Today | | 1 |
| | Flextronics | | 1 |
| | Flectro Motive Diesel | | 1 |
| | Festo Corporation | | 1 |
| | Electro-Motive Diesels | | 1 |
| | Emergine Solutions | | 1 |
| | Encompass Lighting Group | | 1 |
| | Esselte Corporation | | 1 |
| | Ernst & Young L.L.P. | | 1 |
| | Emco Chemical Distributors | | 1 |
| | Exelon Corp | | 1 |
| | ElectroMotive Diesel | | 1 |
| | FANUC America | | 1 |
| | EO Schweitzer Mfg | | 1 |
| | Federal-Mogul Corporation | | 1 |
| | Envista | | 1 |
| | Ernst & Young LLP | | 1 |
| | Federated Group/Golden Bay | | 1 |
| | Ferro Pfanstiehl Labs | | 1 |
| | Gold Eagle Company | | 1 |
| | EMD | | 1 |
| | Epicor Software | | 1 |
| | ETS-Lindgren | | 1 |
| | Informance International | | 1 |
| | Hot Mamas Foods | | 1 |
| | HTI International | | 1 |
| | Hunter Auto Machinery Crop | | 1 |
| | IBM | | 1 |
| | IBM Business Consulting Servic | | 1 |
| | Icon Identity Solutions | | 1 |
| | IFS Industrial & Financial Sys | | 1 |
| | IMC Holdings Incorporated | | 1 |
| | Improvement Is People | | 1 |
| | General Binding Corporation | | 1 |
| | Infor | | 1 |
| | Holly Hunt | | 1 |
| | Integrity Consulting | | 1 |
| | Intentia Americas | | 1 |
| | International Paper | | 1 |
| | International Truck and Engine | | 1 |
| | IS & R | | 1 |
| | ISP3 USA | | 1 |
| | ITT McDonnell & Miller | | 1 |
| | ITW Industrial Finishing | | 1 |
| | ITW Paslode | | 1 |
| | James Hardie Building Products | | 1 |
| | Indiana University - Bloomingt | | 1 |
| | Graymills Corporation | | 1 |
| | Food Svc Professional Arch Chi | | 1 |
| | Fort Dearborn Partners | | 1 |
| | Fuji Photo Film USA-2 | | 1 |
| | G & W Electric | | 1 |
| | GainSystems Inc | | 1 |
| | GAM Enterprises Inc | | 1 |
| | GC America | | 1 |
| | Genesis Packaging & Design | | 1 |
| | Gourmet Kitchens , Inc | | 1 |
| | GPA | | 1 |
| | Horizon Services Group | | 1 |
| | Grayhill Incorporated | | 1 |
| | Honeywell FM & T/KC | | 1 |
| | H J Heinz Co of Canada Ltd | | 1 |
| | Hadady Corporation | | 1 |
| | Haemoscope Corporation | | 1 |
| | Hansen Technologies Corp | | 1 |
| | Heidenhain Corporation | | 1 |
| | Helen R. Backe/USG Corporation | | 1 |
| | Hennig Inc | | 1 |
| | Hersher Consultants | | 1 |
| | HOBO | | 1 |
| | FMI iNC. | | 1 |
| | Grant Thornton LLP | | 1 |
| | Beyer Business Solutions Inc | | 1 |
| | ASSA ABLOY - Rixson | | 1 |
| | AT Kearney Inc | | 1 |
| | Atlas Material Testing Technol | | 1 |
| | Audit Techs | | 1 |
| | Avnet Electronics | | 1 |
| | Avon Products Inc | | 1 |
| | Balance Point Technologies Inc | | 1 |
| | Barilla America Inc | | 1 |
| | Baxter Healthcare | | 1 |
| | Baxter Healthcare Corporation | | 1 |
| | D & R Enterprises LLC | | 1 |
| | Bel Brands USA | | 1 |
| | Armin Industries | | 1 |
| | Bivona Medical Technology | | 1 |
| | Blackman Kallick Bartelstn LLP | | 1 |
| | Bowe Bell + Howell | | 1 |
| | Braeside Displays | | 1 |
| | BSI Consulting Inc | | 1 |
| | Buker Inc | | 1 |
| | Cabot Microelectronics Corp | | 1 |
| | Cadbury Adams | | 1 |
| | Cadent Resources | | 1 |
| | Cambridge Technology Partners | | 1 |
| | Beam Global | | 1 |
| | Aldea Technologies Inc | | 1 |
| | Abbott Laboratories Internatio | | 1 |
| | Abbott Labs | | 1 |
| | Accenture Procurement Solution | | 1 |
| | ACCO Brands | | 1 |
| | ACCO North America | | 1 |
| | Acme Companies | | 1 |
| | ACME Industries Inc | | 1 |
| | Adams Magnetic Products Co | | 1 |
| | Advance Transformer Company | | 1 |
| | Advanced Logistics Group | | 1 |
| | Ashland Hardware Systems | | 1 |
| | Alcatel-Lucent | | 1 |
| | Arrow Electronics | | 1 |
| | Alliant Foodservice | | 1 |
| | Altivity Packaging | | 1 |
| | Alvarez and Marsal | | 1 |
| | AMCO Engineering Company | | 1 |
| | American Express TBS | | 1 |
| | American Hotel Register Co | | 1 |
| | ANI Safety & Supply Inc | | 1 |
| | APICS The Assocation for Opera | | 1 |
| | Apria Healthcare | | 1 |
| | Arbour Group | | 1 |
| | Carter Hoffmann Corp | | 1 |
| | Akzo Nobel Surface Chemistry L | | 1 |
| | DCS Management | | 1 |
| | Capgemini US LLC | | 1 |
| | Conectec RF | | 1 |
| | Contemporary Control Systems I | | 1 |
| | Corporate Safe Specialists | | 1 |
| | Coyote Logistics | | 1 |
| | CR Bard | | 1 |
| | Crowe Chizek & Company L.L.P | | 1 |
| | CSXT | | 1 |
| | Cummins Allison | | 1 |
| | Knowles Electronics | | 1 |
| | ConAgra Foods, Inc. | | 1 |
| | Jockey International Inc | | 1 |
| | Computer Sciences Corporation | | 1 |
| | De Laval Mfg | | 1 |
| | Dean Foods | | 1 |
| | Deere & Company | | 1 |
| | Del Medical | | 1 |
| | Deloitte Consulting | | 1 |
| | DePaul University | | 1 |
| | DEUBLIN COMPANY | | 1 |
| | DJ Dureno & Associates | | 1 |
| | Doall Company | | 1 |
| | Dynalink | | 1 |
| | Echo Incorporated | | 1 |
| | Cushman & Wakefield | | 1 |
| | Chicago Rawhide | | 1 |
| | Ed Miniat, Inc | | 1 |
| | Caterpillar Inc | | 1 |
| | CE Niehoff 4 CO. | | 1 |
| | Center for Professional Mgt | | 1 |
| | Center of Excellence | | 1 |
| | Central Michigan University | | 1 |
| | CGN & Associates | | 1 |
| | CH Robinson - TMC | | 1 |
| | Chamberlain Group | | 1 |
| | Chemtech Plastics Inc | | 1 |
| | Concentric Incorporated | | 1 |
| | Chicago Mattress Company | | 1 |
| | Caremark PSD | | 1 |
| | Chicago Scenic Studios | | 1 |
| | Cinch Connectors | | 1 |
| | Cloverhill Pastry-Vend Corp | | 1 |
| | CNH Global | | 1 |
| | Cognis Corporation | | 1 |
| | Coker Creative Solutions | | 1 |
| | College of American Pathologis | | 1 |
| | Command Alkon | | 1 |
| | Communications Test Design Inc | | 1 |
| | Compass Business Solutions | | 1 |
| | Computer Associates Intl Inc | | 1 |
| | Chicago Faucets | | 1 |
| | Supply Chain Management | | 1 |
| | R. S. Owens | | 1 |
| | Shur-Line | | 1 |
| | SIBC Corporation | | 1 |
| | Siemens Medical Systems | | 1 |
| | Siemens Water Technologies | | 1 |
| | Sony Entertainment Distributio | | 1 |
| | Square D Company | | 1 |
| | Standard Parking | | 1 |
| | Sternberg Lighting | | 1 |
| | Strategic Partners,LLC | | 1 |
| | SHK Partners | | 1 |
| | Superior Graphite Company | | 1 |
| | Sencon Inc | | 1 |
| | SupplyMex, Inc. | | 1 |
| | SYSMEX America | | 1 |
| | System Sensor | | 1 |
| | T&B Tube Company Incorporated | | 1 |
| | Taconic | | 1 |
| | Taratec Development Corp | | 1 |
| | Tempel Steel Company | | 1 |
| | Tempel Steel Motor Division | | 1 |
| | Tenneco | | 1 |
| | The City of Wheaton | | 1 |
| | The Donas Group Inc | | 1 |
| | Sunstone Incorporated | | 1 |
| | Rollex Building Products | | 1 |
| | Kneisel Industries Inc | | 1 |
| | Radionic Industries, Inc. | | 1 |
| | Rapid Solutions Group | | 1 |
| | Rauland-Borg Corporation | | 1 |
| | Recon/Optical | | 1 |
| | Reuters America Inc | | 1 |
| | Revell-Monogram Incorporated | | 1 |
| | Rexnord Seal Operation | | 1 |
| | Riddell, Inc. | | 1 |
| | Rixson | | 1 |
| | Shure Inc | | 1 |
| | Rohm & Haas | | 1 |
| | The Faucet Queens Inc | | 1 |
| | RQA, Inc. | | 1 |
| | RR Donnelley Logistics | | 1 |
| | Ryan Hill | | 1 |
| | S&C Electric | | 1 |
| | SAP Americas | | 1 |
| | Sara Lee | | 1 |
| | SBC Services | | 1 |
| | Schnadig Corporation | | 1 |
| | Scholle Corporation | | 1 |
| | Schwarz | | 1 |
| | Scotsman Ice Systems | | 1 |
| | Rogers Corporation | | 1 |
| | WM Wrigley Jr Company | | 1 |
| | US Tsubaki | | 1 |
| | Valspar Corporation | | 1 |
| | Velsicol Chemical Corporation | | 1 |
| | Viasys Medsystems | | 1 |
| | Virgchow Krause and Company LL | | 1 |
| | VMG Consulting | | 1 |
| | W.W. Grainger, Inc. | | 1 |
| | West Monroe Partners | | 1 |
| | Western Piece Dyers | | 1 |
| | Wheatland Tube Company | | 1 |
| | The Donnas Group | | 1 |
| | Winpak Portion Packaging | | 1 |
| | University of Chicago | | 1 |
| | Wm Wrigley Jr. Co | | 1 |
| | Wm. Wrigley Jr. | | 1 |
| | Wm. WRIGLEY Jr. Co. | | 1 |
| | Woodward Controls Inc | | 1 |
| | World Kitchen | | 1 |
| | World Kitchen Incorporated | | 1 |
| | World's Finest Chocolate Inc | | 1 |
| | WR Grace | | 1 |
| | Wrap-On Company Incorporated | | 1 |
| | WT Russell Ltd | | 1 |
| | Zebra Technologies Corporation | | 1 |
| | Wichita State University | | 1 |
| | Tripplite | | 1 |
| | R Reed Business Systems | | 1 |
| | The Keystone Group | | 1 |
| | The Visual Pak Companies | | 1 |
| | TimeMed Labeling Systems | | 1 |
| | TJB | | 1 |
| | TNH, Inc | | 1 |
| | Toyal America Inc | | 1 |
| | Toyal America, Inc | | 1 |
| | Transilwrap Company Inc | | 1 |
| | Tredegar Film Products | | 1 |
| | Tri Lite, Inc. | | 1 |
| | US Fujitsu Consulting | | 1 |
| | Trinity Rail | | 1 |
| | University of Illinois | | 1 |
| | Turtle Wax Incorporated | | 1 |
| | Uline | | 1 |
| | Uline Inc | | 1 |
| | Unilever Bestfoods | | 1 |
| | Unilever HPC USA | | 1 |
| | Unisource Supply Systems | | 1 |
| | Unistaff, Inc. | | 1 |
| | United Parcel Service | | 1 |
| | United Rentals | | 1 |
| | Univar USA Inc | | 1 |
| | The Edlong Co | | 1 |
| | Triangle Engineered Products | | 1 |
| | McCain Foods | | 1 |
| | R.A. Steele & Associates | | 1 |
| | Lindgren RF Enclosure Inc | | 1 |
| | LTD Commodities | | 1 |
| | LXE | | 1 |
| | M. Gartner Consulting | | 1 |
| | M/S. Lakshi Precision Screws, | | 1 |
| | MacDermid Autotpye Inc | | 1 |
| | MacLean Power Systems | | 1 |
| | MacLean Vehicle Systems | | 1 |
| | Maple Leaf Bakery | | 1 |
| | LaMarsh K Associates | | 1 |
| | Maurice Sporting Goods | | 1 |
| | L3 ELECTRODYNAMICS | | 1 |
| | McCain Foods USA, Inc. | | 1 |
| | McCain USA | | 1 |
| | McGladrey & Pullen LLP | | 1 |
| | McIntyre Group Limited | | 1 |
| | McIntyre Group Ltd. | | 1 |
| | Medline Inds Inc/Dynacor Div | | 1 |
| | Midland Manufacturing | | 1 |
| | Midland Mfg. Corp. | | 1 |
| | Midland Paper Comapny | | 1 |
| | MJ Celco Inc | | 1 |
| | Morton Grove Phar | | 1 |
| | Market Track | | 1 |
| | Keystone Consultant | | 1 |
| | JohnsonDiversey | | 1 |
| | Jones Lang | | 1 |
| | Juno Lighting Incorporated | | 1 |
| | Kamco Industries | | 1 |
| | Kaplan Professional | | 1 |
| | Kar Products | | 1 |
| | Kellogg | | 1 |
| | Kellogg Company | | 1 |
| | Kemlite Company Incorporated | | 1 |
| | Kenall Manufacturing | | 1 |
| | Liberty Technology Advisors | | 1 |
| | Kerry Sweet | | 1 |
| | Motorola Inc | | 1 |
| | KI Industries Inc | | 1 |
| | Kineticsware | | 1 |
| | Klein Tools | | 1 |
| | KleinTools | | 1 |
| | Knowlege Sculpting, Ltd. | | 1 |
| | Knowles Electronics LLC | | 1 |
| | Komet of America | | 1 |
| | KPMG Consulting | | 1 |
| | KPMG LLP | | 1 |
| | Kraft Foods | | 1 |
| | KVH Industries Inc | | 1 |
| | Kenall Manufacturing Co. | | 1 |
| | Power Parts | | 1 |
| | Peddinghaus Corporation | | 1 |
| | Peer Bearings | | 1 |
| | Peerless Industries Inc | | 1 |
| | Peerless Industries, Inc. | | 1 |
| | Pentair Electronic Packaging | | 1 |
| | PeopleSoft Incorporated | | 1 |
| | PepsiCo Chicago | | 1 |
| | Pga Golf | | 1 |
| | Philips Lighting Electronics N | | 1 |
| | Plan for Excellence, Inc. | | 1 |
| | Motor Coach Industries | | 1 |
| | PolyScience | | 1 |
| | Pactiv Corporation | | 1 |
| | Prairie Packaging | | 1 |
| | Preferred Meal Systems | | 1 |
| | Prince Inc. | | 1 |
| | Printpack Inc | | 1 |
| | Procurement Professionals | | 1 |
| | Protiviti | | 1 |
| | Purac America | | 1 |
| | QAD Incorporated | | 1 |
| | Quality Carbide Tool | | 1 |
| | Quality Carbide Tool, Inc | | 1 |
| | Quickset International | | 1 |
| | Pliant Corp | | 1 |
| | North American Corporation | | 1 |
| | John Crane Inc | | 1 |
| | MSC Engineered Materials & Sol | | 1 |
| | N E S | | 1 |
| | Nabisco | | 1 |
| | Nashua Corp | | 1 |
| | Nashua Corporation | | 1 |
| | National Cycle Incorporated | | 1 |
| | Nestle Clinical Nutrition | | 1 |
| | Next Generation Logistics | | 1 |
| | Niagara LaSalle Corporation | | 1 |
| | Nippon Express USA, Inc. | | 1 |
| | Parker Hannifin Corporation | | 1 |
| | Norman Equipment Company | | 1 |
| | Paris: Consultants | | 1 |
| | Northpoint Horizons | | 1 |
| | Northrop Grumman Corporation | | 1 |
| | Numetrix Incorporated | | 1 |
| | Office Depot | | 1 |
| | Old World Industries | | 1 |
| | Olmarc Packing Company | | 1 |
| | OnDemand Resources | | 1 |
| | Oracle | | 1 |
| | OSG Tap & Die Inc | | 1 |
| | Ostrow Reisin Berk & Abrams Lt | | 1 |
| | Motorola | | 1 |
| | Nissan Forklift Corporation NA | | 1 |
