| AMALGAMATED BANK OF CHICAGO | FINANCIAL INSTITUTION | $1,006,026 |
| NIPSCO | UTILITY COMPANY | $126,503 |
| BERGLUND CONSTRUCTION | GENERAL CONTRACTOR | $123,459 |
| COMMONWEALTH EDISON | UTILITY COMPANY | $115,135 |
| THE CLEANING CREW | JANITORIAL COMPANY | $82,240 |
| HAYES MECHANICAL | MECHANICAL CONTRACTOR | $79,760 |
| ABM JANITORIAL SERVICES | JANITORIAL COMPANY | $72,964 |
| TOTAL ELECTRIC, INC. | ELECTRICAL CONTRACTOR | $66,645 |
| NATIONAL CLEANING SERVICES, INC. | JANITORIAL COMPANY | $65,123 |
| DATA RESEARCH GROUP | IT CONSULTANT | $56,925 |
| PERENNIAL COMPANIES, INC. | LANDSCAPE MAINTENANCE COMPANY | $49,318 |
| PIPE FITTERS' WELFARE FUND, LOCAL 597 | TAFT-HARTLEY TRUST FUND | $44,092 |
| EVEREST SNOW MANAGEMENT, INC. | SNOW REMOVAL COMPANY | $39,935 |
| XO COMMUNICATIONS | DATA AND IP SERVICE PROVIDER | $30,013 |
| MONTANA INVESTMENTS LLC | LANDLORD | $25,053 |
| LASALLE CONSULTING PARTNERS INC. | IT CONSULTANT | $24,310 |
| CHICAGO OFFICE PRODUCTS CO. | OFFICE SUPPLIES VENDOR | $19,674 |
| NICOR | UTILITY COMPANY | $17,975 |
| FIRST COMMUNICATIONS LLC | TECHNOLOGY SOLUTIONS COMPANY | $17,396 |
| AQUAMIST PLUMBING & LAWN SPRINKLING CO. | LAWN SPRINKLER MAINTENANCE COMPANY | $15,495 |
| COMCAST | CABLE AND INTERNET COMPANY | $15,449 |
| CITY OF AURORA | MUNICIPALITY | $14,408 |
| PIPE FITTERS' TRAINING FUND, LOCAL 597 | TAFT-HARTLEY TRUST FUND | $14,377 |
| HUBINGER LANDSCAPING CO. | LANDSCAPE MAINTENANCE COMPANY | $14,153 |
| FOX METRO | LOCAL GOVERNMENT AGENCY | $13,929 |
| GROOT, INC. | GARBAGE DISPOSAL SERVICE PROVIDER | $11,670 |
| NATIONAL DECORATING SERVICES | PAINTING AND DECORATING CONTRACTOR | $11,333 |
| BOND BROTHERS & COMPANY | PRINTING COMPANY | $10,367 |
| PEOPLES GAS | UTILITY COMPANY | $10,236 |
| CMRS-FP | POSTAGE PROVIDER | $8,400 |
| ULB-DRY WATERPROOFING, INC. | WATERPROOFING CONTRACTOR | $8,385 |
| CALUMET CITY PLUMBING CO., INC. | PLUMBING CONTRACTOR | $8,105 |
| FLOOD BROTHERS DISPOSAL | GARBAGE DISPOSAL SERVICE PROVIDER | $7,906 |
| FRONTRUNNER SYSTEMS, INC. | GLAZING CONTRACTOR | $7,085 |
| OLSSON ROOFING COMPANY, INC. | ROOFING CONTRACTOR | $6,532 |
| DATAMATION IMAGING | DOCUMENT SCANNING COMPANY | $6,222 |
| OTIS ELEVATOR COMPANY | ELEVATOR SERVICE COMPANY | $5,999 |
| HINCKLEY SPRINGS | DRINKING WATER SUPPLIER | $5,580 |
| CORSETTI STRUCTURAL STEEL, INC. | STEEL FABRICATION CONTRACTOR | $5,322 |
| PERIMETER ACCESS SYSTEM SERVICES | SECURITY ACCESS CONTROL COMPANY | $5,223 |
| THE PERFORMANCE COMPANIES, INC. | CLEANING SERVICE | $5,100 |
