| Helpsource of North Shore INC | Health Care and Social Assistance | $1,397,625 | $1,410,338 | 480 | $111.2M |  Research |
| Belmont Trading Co INC | Wholesale Trade | $1,377,192 | $1,387,291 | 136 | $41.7M | Research |
| Burgess Computer Decisions INC | Professional, Scientific, and Technical Services | $1,374,335 | $1,381,665 | 79 | $16.3M | Research |
| Sms-Na, LLC | Professional, Scientific, and Technical Services | $1,353,700 | $1,372,355 | 112 | $11.6M | Research |
| Symphony Buffalo Grove LLC | Health Care and Social Assistance | $1,352,247 | $1,375,031 | 189 | $32.2M | Research |
| Buffalo Group LLC | Retail Trade | $1,059,300 | $1,066,391 | 91 | $24.6M | Research |
| Wes-Tech Automation Solutions, LLC | Manufacturing | $1,049,500 | $1,055,826 | 56 | $14.7M | Research |
| Indeck O&m LLC | Utilities | $1,016,121 | $1,032,605 | 52 | N/A | Research |
| International Toner Company LLC | Wholesale Trade | $961,400 | $972,830 | 90 | $27.6M | Research |
| Tekassembly Corporation | Professional, Scientific, and Technical Services | $875,000 | $881,587 | 45 | $9.3M | Research |
| Wes-Tech Automation Solutions LLC | Manufacturing | $841,100 | $844,745 | 54 | $14.1M | Research |
| Business It Source, Inc. | Professional, Scientific, and Technical Services | $775,000 | $780,549 | 62 | $12.8M | Research |
| Multimedia Sales & Marketing INC | Professional, Scientific, and Technical Services | $771,461 | $779,068 | 88 | $9.9M | Research |
| Int, INC | Unknown | $768,647 | $776,347 | 40 | N/A | Research |
| Ruby Robinson Holdings, Inc. | Wholesale Trade | $745,000 | $753,236 | 50 | $12.9M | Research |
| On a Roll Trucking INC | Transportation and Warehousing | $732,000 | $737,531 | 43 | $8.7M | Research |
| Zonatherm Products, Inc. | Wholesale Trade | $672,270 | $676,397 | 35 | $10.7M | Research |
| Omni Youth Services | Health Care and Social Assistance | $658,688 | $664,396 | 69 | N/A | Research |
| The Leider Horticultural Companies INC | Agriculture, Forestry, Fishing and Hunting | $657,300 | $665,638 | 70 | $7.2M | Research |
| The Leider Horticultural Companies Inc. | Agriculture, Forestry, Fishing and Hunting | $657,300 | $663,106 | 70 | $7.2M | Research |
| Tara Tanksley-Stallings | Wholesale Trade | $636,200 | $640,732 | 40 | $12.3M | Research |
| Assurance Heating & Air Conditioning, Inc. | Construction | $625,637 | $630,676 | 42 | $13.3M | Research |
| Hp Tuners, LLC | Professional, Scientific, and Technical Services | $625,500 | $631,361 | 45 | $9.3M | Research |
| Premier Eye Care & Surgery Ltd | Health Care and Social Assistance | $618,172 | $624,264 | 51 | $16.0M | Research |
| 77018 Company | Unknown | $615,468 | $618,476 | 110 | N/A | Research |