| Willow Creek Community Church, Inc. | Other Services (except Public Administration) | $5,683,425 | $5,750,679 | 353 | N/A |  Research |
| Motor Werks of Barrington, INC | Other Services (except Public Administration) | $5,471,500 | $5,525,911 | 346 | $67.8M | Research |
| Swiss Automation, Inc. | Manufacturing | $3,224,900 | $3,270,497 | 280 | $68.4M | Research |
| Idealease, Inc. | Real Estate and Rental and Leasing | $2,463,500 | $2,499,271 | 182 | $82.2M | Research |
| Wickstrom Ford Lincoln Mercury Inc. | Retail Trade | $2,158,750 | $2,183,836 | 155 | $39.1M | Research |
| Derick Dermatology LLC | Health Care and Social Assistance | $2,076,400 | $2,100,971 | 225 | $70.6M | Research |
| The Garlands of Barrington, LLC | Health Care and Social Assistance | $1,910,250 | $1,930,271 | 214 | $36.4M | Research |
| Murray INC | Manufacturing | $1,640,600 | $1,650,808 | 137 | $38.3M | Research |
| Acres Enterprises, Inc. | Professional, Scientific, and Technical Services | $1,482,500 | $1,355,053 | 102 | $20.6M | Research |
| Willow Creek Association | Other Services (except Public Administration) | $1,295,600 | $1,305,605 | 68 | N/A | Research |
| Willow Creek Association | Other Services (except Public Administration) | $1,295,600 | $1,304,741 | 60 | N/A | Research |
| Advantage Valet Parking INC | Other Services (except Public Administration) | $1,261,400 | $1,312,303 | 305 | $58.3M | Research |
| Netronix Corporation | Professional, Scientific, and Technical Services | $1,182,565 | $1,193,872 | 65 | $13.4M | Research |
| Just Payroll & Staffing, Inc. | Administrative and Support and Waste Management | $1,166,902 | $1,185,189 | 463 | $72.9M | Research |
| Barrington Transportation Co. INC | Transportation and Warehousing | $1,132,500 | $1,138,147 | 214 | $82.3M | Research |
| Barrington Transportation Co., Inc. | Transportation and Warehousing | $1,132,500 | $1,142,118 | 214 | $82.3M | Research |
| Compliance Partners, LLC DBA Gxp Compliance Staffing | Professional, Scientific, and Technical Services | $1,125,700 | $584,305 | 103 | $21.4M | Research |
| A. Horn, Inc. | Construction | $933,500 | $940,636 | 50 | $5.4M | Research |
| A. Horn Inc. | Construction | $933,500 | $939,075 | 36 | <$5M | Research |
| Mobile Support INC | Retail Trade | $912,700 | $970,481 | 150 | $45.9M | Research |
| Mobile Support INC | Retail Trade | $898,670 | $904,861 | 96 | $29.4M | Research |
| Just Payroll & Staffing Inc. | Administrative and Support and Waste Management | $896,517 | $854,767 | 285 | $44.9M | Research |
| Gk Development INC | Construction | $868,752 | $874,013 | 92 | $28.5M | Research |
| Gk Development Inc. | Real Estate and Rental and Leasing | $859,055 | $863,398 | 58 | $8.4M | Research |
| Chicago Cardiology Institute, S.c. | Health Care and Social Assistance | $793,661 | $804,331 | 62 | $19.5M | Research |