| Stevenson Crane Service, Inc. | Construction | $3,720,700 | $3,351,700 | 322 | $99.8M |  Research |
| Wastebuilt Environmental Solutions, LLC | Administrative and Support and Waste Management | $2,436,317 | $2,464,018 | 179 | $33.9M | Research |
| Wi-Tronix, LLC | Professional, Scientific, and Technical Services | $2,292,800 | $2,321,842 | 131 | $27.1M | Research |
| Butterfield Health Care, INC | Health Care and Social Assistance | $2,201,640 | $0 | 267 | $45.4M | Research |
| Neuco INC | Wholesale Trade | $2,120,417 | $2,145,921 | 178 | $54.5M | Research |
| D & D Tooling and Manufacturing, Inc. | Manufacturing | $2,078,835 | $2,106,395 | 500 | $130.9M | Research |
| Modular Installations & Design INC | Administrative and Support and Waste Management | $1,793,500 | $1,812,909 | 71 | $15.4M | Research |
| Computer Projects of Illinois, Inc. | Professional, Scientific, and Technical Services | $1,686,300 | $1,705,318 | 74 | $15.3M | Research |
| Windowworks Inc. | Retail Trade | $1,659,400 | $1,670,175 | 107 | $19.4M | Research |
| Window Works INC | Construction | $1,590,700 | $1,598,283 | 107 | $32.5M | Research |
| Uc Payroll Inc. | Administrative and Support and Waste Management | $1,541,607 | $1,566,016 | 147 | $23.1M | Research |
| Uc Payroll, Inc. | Transportation and Warehousing | $1,541,600 | $1,558,472 | 155 | $23.4M | Research |
| Scrip, Inc. | Wholesale Trade | $1,433,100 | $1,443,331 | 122 | $37.4M | Research |
| Chicago Exhibit Productions Inc. | Construction | $1,377,193 | $1,390,391 | 281 | $95.7M | Research |
| Chicago Exhibit Productions, Inc. | Construction | $1,377,193 | $1,403,168 | 281 | $95.7M | Research |
| General Converting Inc. | Manufacturing | $1,322,817 | $1,337,479 | 69 | $68.4M | Research |
| Integrated Medical Systems INC | Wholesale Trade | $1,258,200 | $1,266,483 | 100 | $30.6M | Research |
| Victor Technology, LLC | Wholesale Trade | $1,201,394 | $1,217,321 | 108 | $33.1M | Research |
| Connemara Converting LLC | Wholesale Trade | $1,172,824 | $1,180,954 | 72 | $18.5M | Research |
| Advantage Chevrolet of Bolingbrook | Retail Trade | $1,123,700 | $1,135,614 | 76 | $19.2M | Research |
| Interra, Inc. | Professional, Scientific, and Technical Services | $1,115,119 | $1,127,614 | 45 | <$5M | Research |
| Valor Technologies, INC | Administrative and Support and Waste Management | $1,094,260 | $1,107,331 | 45 | $8.5M | Research |
| Valor Technologies Inc. | Administrative and Support and Waste Management | $1,094,259 | $1,100,165 | 45 | $8.5M | Research |
| Warren F. Thomas Plumbing Co. | Construction | $1,010,000 | $1,020,942 | 41 | $13.0M | Research |
| Midwest Fuel Injection Service, Corp | Other Services (except Public Administration) | $984,619 | $998,512 | 80 | $15.7M | Research |