| Fourgen Holdings, Incorporated | Construction | $10,000,000 | $10,115,068 | 496 | $163.2M |  Research |
| A M Castle and Co | Wholesale Trade | $10,000,000 | $10,124,167 | 500 | $153.2M | Research |
| Launch Technical Workforce Solutions, LLC | Manufacturing | $10,000,000 | $8,181,368 | 500 | $130.9M | Research |
| Summit Staffing | Administrative and Support and Waste Management | $6,250,000 | $6,335,590 | 500 | $78.7M | Research |
| Inland Investment Real Estate Service, Inc. | Real Estate and Rental and Leasing | $6,218,984 | $6,358,528 | 456 | $66.1M | Research |
| Witt Kieffer INC | Administrative and Support and Waste Management | $5,883,100 | $5,145,388 | 265 | $41.7M | Research |
| Nephrology Associates of Northern Illinois Ltd | Health Care and Social Assistance | $5,600,700 | $5,663,919 | 398 | $70.8M | Research |
| Blistex, Inc. | Manufacturing | $5,001,400 | $5,067,921 | 240 | $238.0M | Research |
| Radiological Society of North America INC | Other Services (except Public Administration) | $4,055,892 | $4,105,577 | 252 | N/A | Research |
| Rhm, LLC | Administrative and Support and Waste Management | $3,926,265 | $3,974,252 | 487 | $76.6M | Research |
| The Inland Real Estate Group, LLC | Real Estate and Rental and Leasing | $2,814,088 | $2,851,249 | 160 | $29.3M | Research |
| National Decorating Service, Inc. | Construction | $2,790,000 | $2,822,550 | 89 | $15.3M | Research |
| Independence Plus, Inc. | Health Care and Social Assistance | $2,479,917 | $2,511,467 | 401 | $68.7M | Research |
| True Group, INC | Professional, Scientific, and Technical Services | $2,424,625 | $2,452,710 | 121 | $12.5M | Research |
| Jvm Realty Corporation | Real Estate and Rental and Leasing | $2,135,100 | $2,154,672 | 134 | $19.4M | Research |
| Cara Group INC | Professional, Scientific, and Technical Services | $2,013,100 | $2,034,629 | 136 | $28.1M | Research |
| Vinayaka Hospitality Oakbrook LLC | Accommodation and Food Services | $2,000,000 | $2,016,986 | 215 | $67.2M | Research |
| Upg Enterprises LLC | Wholesale Trade | $2,000,000 | $2,020,167 | 146 | $44.7M | Research |
| Fgm Architects INC | Professional, Scientific, and Technical Services | $1,978,507 | $2,001,425 | 125 | $38.8M | Research |
| Professional Benefit Administrators Holding Group, Inc. | Professional, Scientific, and Technical Services | $1,949,400 | $1,970,031 | 106 | $11.0M | Research |
| Vh-M Oakbrook Illinois Inc. | Accommodation and Food Services | $1,892,931 | $1,906,519 | 252 | $78.8M | Research |
| Jvm Realty Corporation | Real Estate and Rental and Leasing | $1,708,100 | $1,713,319 | 134 | $20.1M | Research |
| Launch Management Services | Manufacturing | $1,572,700 | $1,594,325 | 121 | $31.7M | Research |
| Vinayaka Hospitality Oakbrook LLC | Accommodation and Food Services | $1,569,168 | $1,579,230 | 215 | $67.2M | Research |
| One Home Health Agency Ltd | Health Care and Social Assistance | $1,462,800 | $1,474,909 | 170 | $29.1M | Research |