1. 4 Discovery
    Information Management Services & Systems
  2. ABM
    Building Maintenance Services & Supplies
  3. Amazon Business
    Supply Inventory & Distribution Tracking Systems
  4. American Fidelity Assurance Co.
    Employee Benefits Administration
  5. Andrews Technology
    Office Automation Systems
  6. ARAMARK Education
    Building Maintenance Services & Supplies
  7. Arbor Management, Inc.
    Food Service Supplies & Management
  8. ARCON Associates, Inc.
    Architectural & Engineering Services
  9. Arthur J. Gallagher & Co.
    Insurance Carriers & Claim Administration
  10. Asset Control Solutions, Inc.
    Appraisal Services
  11. AXA Advisors, LLC
    Employee Benefits Administration
  12. Baker Tilly Virchow Krause, LLP
    Accounting & Finance Reporting Services
  13. BCI Burke, Co.
    Athletic Equipment & Supplies
  14. BELFOR USA
    Disaster Planning/Restorations
  15. BMO Harris Bank N.A.
    Banks & Financial Service Institutions
  16. Buckeye Cleaning Center-Chicago
    Maintenance Equipment Products & Supplies
  17. Building IQ
    Building Automation Controls
  18. CallOne
    Communications Systems & Equipment
  19. Cannon Design
    Architectural & Engineering Services
  20. Canon Solutions America, Inc.
    Copiers, Fax Machines & Document Management Systems
  21. Carroll Seating Company, Inc.
    Seating/Auditorium & Bleachers
  22. CenterPoint Energy
    Energy Conservation Equipment
  23. Central States Bus Sales, Inc.
    School Bus
  24. Chapman and Cutler LLP
    Legal Services
  25. Cintas Corporation
    Building Maintenance Services & Supplies
  26. Commerce Bank
    Banks & Financial Service Institutions
  27. Computer Information Concepts, Inc.
    Information Management Services & Systems
  28. Illinois Energy Consortium
    Energy Conservation Equipment
  29. Cook-Illinois Corp./Twin Lakes Trans. Consulting
    Transportation Services & Management
  30. Cordogan, Clark & Associates, Inc.
    Architectural & Engineering Services
  31. CTS Group
    Performance Contracting
  32. Cunningham Recreation/GameTime
    Building Maintenance Services & Supplies
  33. Diversified Benefit Services, Inc.
    Employee Benefits Administration
  34. DLA Architects, Ltd.
    Architectural & Engineering Services
  35. Ehlers & Associates, Inc.
    Investment & Financial Consulting
  36. Elemental Solutions, LLC
    HVAC Systems & Equipment
  37. EMA Chicago, Inc.
    HVAC Systems & Equipment
  38. Energy Performance
    Energy Conservation Equipment
  39. Energy Systems Group (ESG)
    Performance Contracting
  40. Envirox, LLC
    Maintenance Equipment Products & Supplies
  41. Eriksson Engineering Associates, Ltd.
    Architectural & Engineering Services
  42. Facilitron, Inc.
    Facilities Planners
  43. FGM Architects, Inc.
    Architectural & Engineering Services
  44. Fifth Third Securities
    Banks & Financial Service Institutions
  45. First Midwest Bank
    Banks & Financial Service Institutions
  46. Forecast5 Analytics, Inc.
    Investment & Financial Consulting
  47. Frank Cooney Company, Inc.
    Classroom Furniture & Equipment
  48. Frontline Technologies
    Information Management Services & Systems
  49. GCA Services Group
    Maintenance Equipment Products & Supplies
  50. GCG Financial, Inc.
    Insurance Carriers & Claim Administration
  51. Gilbane Building Company
    Construction Management
  52. Graybar
    Building Maintenance Services & Supplies
  53. GreenAssociates, Inc.
    Architectural & Engineering Services
  54. Group Alternatives, Inc.
    Insurance Carriers & Claim Administration
  55. Healy, Bender & Associates, Inc.
    Architectural & Engineering Services
  56. Heartland School Solutions
    Billing Services
  57. Henry Bros. Construction Mgmt. Services, Inc.
    Construction Management
  58. Horace Mann Insurance Company
    403(b) & other Tax-Sheltered Annuities
  59. HPS
    Bidding & Purchasing Systems
  60. Huntington National Bank
    Banks & Financial Service Institutions
  61. Ice Miller LLP
    Legal Services
  62. Illinois Learning Technology Purchase Program
    Information Management Services & Systems
  63. Imagetec L. P.
    Copiers, Fax Machines & Document Management Systems
  64. Impact Networking, LLC.
    Copiers, Fax Machines & Document Management Systems
  65. Industrial Appraisal
    Appraisal Services
  66. Ingersoll Rand-Trane
    Performance Contracting
  67. Innovative Modular Solutions, Inc.
    Portable & Relocatable Systems
  68. INSPEC, Inc.
    Architectural & Engineering Services
  69. International Contractors, Inc.
    Construction Management
  70. Interstate Roof Systems Consultants, Inc.
    Roofing Services
  71. ISDLAF+
    Legal Services
  72. IT Savvy
    Communications Systems & Equipment
  73. JMA Architects
    Architectural & Engineering Services
  74. Johnson Controls, Inc.
    HVAC Systems & Equipment
  75. J. P. Morgan Chase Bank, NA
    Banks & Financial Service Institutions
  76. Key Benefit Concepts, LLC
    Accounting & Finance Reporting Services
  77. Kiefer Specialty Flooring, Inc.
    Floor Maintenance
  78. Klein Hall CPAs
    Accounting & Finance Reporting Services
  79. Lamp Incorporated
    Construction Management
  80. Lauterbach & Amen, LLP
    Accounting & Finance Reporting Services
  81. Legat Architects
    Architectural & Engineering Services
  82. Lincoln Investment
    School District Investment Analysts & Financial Advisers
  83. Lowery McDonnell Company
    Classroom Furniture & Equipment
  84. MB Financial Bank, N.A.
    Banks & Financial Service Institutions
  85. McKinstry
    Performance Contracting
  86. Mesirow Financial, Inc.
    Banks & Financial Service Institutions
  87. MidCo, Inc.
    Communications Wire & Cable Systems
  88. Midwest Transit Equipment, Inc.
    School Bus
  89. Miller, Cooper & Co., Ltd.
    Accounting & Finance Reporting Services
  90. Moody's Investors Service
    Investment & Financial Consulting
  91. National IPA/TCPN
    Procurement & e-Procurement Systems
  92. Nicholas & Associates, Inc.
    Construction Management
  93. Nora Systems, Inc.
    Flooring Carpeting & Floor Coverings
  94. Office Depot
    Office Automation Systems
  95. Oppenheimer & Co. Inc.
    Banks & Financial Service Institutions
  96. OpTerra Energy Services
    Performance Contracting
  97. Patcraft Commercial Carpets
    Flooring Carpeting & Floor Coverings
  98. PaySchools
    Information Management Services & Systems
  99. Pepper Construction Company
    Construction Management
  100. Performance Services, Inc.
    Performance Contracting
  101. Perkins+Will
    Architectural & Engineering Services
  102. PFM Asset Management LLC
    School District Investment Analysts & Financial Advisers
  103. Plante Moran
    Management Services
  104. PMA Financial Network, Inc.
    Accounting & Finance Reporting Services
  105. PMA Securities, Inc.
    Banks & Financial Service Institutions
  106. PowerSchool
    Information Management Services & Systems
  107. Preferred Meals
    Food Service Supplies & Management
  108. Proven Business Systems
    Copiers, Fax Machines & Document Management Systems
  109. PublicSchoolWORKS
    Risk Management & Safety Programs
  110. Quest Food Management Services, Inc.
    Food Service Supplies & Management
  111. RBC Capital Markets, LLC
    Banks & Financial Service Institutions
  112. RevTrak
    Banks & Financial Service Institutions
  113. Robert W. Baird & Co.
    Administration Financial Management Systems & Services
  114. Rycor Software
    Computer Hardware & Software
  115. Sandner Group ARS
    Insurance Carriers & Claim Administration
  116. Scranton Products
    Washroom Equipment & Accessories
  117. SFE - Southwest Foodservice Excellence
    Food Service Supplies & Management
  118. Siemens Industry, Inc.
    Performance Contracting
  119. Sikich, LLP
    Legal Services
  120. Single Path
    Communications Systems & Equipment
  121. Skyward, Inc.
    Information Management Services & Systems
  122. Software Unlimited, Inc.
    Accounting & Financial Software
  123. Specialized Data Systems, Inc.
    Accounting & Financial Software
  124. Stalker Sports Floors
    Flooring Carpeting & Floor Coverings
  125. Life Safety Hardware Consultants
    Security Equipment, Systems & Consulting
  126. Stifel, Nicolaus & Company
    Administration Financial Management Systems & Services
  127. STR Building Resources LLC
    Architectural & Engineering Services
  128. T. A. Cummings Jr. Co.
    Insurance Carriers & Claim Administration
  129. Tandus Centiva
    Flooring Carpeting & Floor Coverings
  130. Team REIL
    Construction Management
  131. The Garland Company
    Roofing Services
  132. The Larson Equipment & Furniture Co.
    Seating/Auditorium & Bleachers
  133. The RMP Group
    Administration Financial Management Systems & Services
  134. TimeClock Plus
    Communications Systems & Equipment
  135. TIPS (The Interlocal Purchasing Systems)
    Bidding & Purchasing Systems
  136. TRIA Architecture, Inc.
    Architectural & Engineering Services
  137. TSA Consulting Group, Inc.
    Accounting & Finance Reporting Services
  138. Turner Construction
    Construction Management
  139. Tyler Technologies, Inc.
    Information Management Services & Systems
  140. U.S. Communities
    Bidding & Purchasing Systems
  141. Vanguard Energy Services, LLC
    Energy Conservation Equipment
  142. Virco, Inc.
    Classroom Furniture & Equipment
  143. Voya Financial
    403(b) & other Tax-Sheltered Annuities
  144. Warehouse Direct Workplace Solutions
    Maintenance Equipment Products & Supplies
  145. Wight & Company
    Architectural & Engineering Services
  146. William Blair & Company, LLC
    Accounting & Finance Reporting Services
  147. Wintrust Financial
    Banks & Financial Service Institutions
  148. Wold Architects & Engineers
    Architectural & Engineering Services
  149. Zions Bank
    Banks & Financial Service Institutions