| Andy Frain Services, Inc. | Administrative and Support and Waste Management | $10,000,000 | $10,130,278 | 500 | $73.2M |  Research |
| Unite Here Health | Finance and Insurance | $7,687,960 | $7,768,043 | 211 | N/A | Research |
| Finnegan International Incorporated | Manufacturing | $6,854,700 | $6,941,336 | 459 | $120.2M | Research |
| Engineering Systems Inc. | Professional, Scientific, and Technical Services | $6,487,500 | $5,094,424 | 330 | $40.7M | Research |
| Alarm Detection Systems, Inc. | Administrative and Support and Waste Management | $4,736,400 | $4,789,474 | 339 | $49.7M | Research |
| Peerless Industries, Inc. | Manufacturing | $4,407,308 | $4,466,929 | 307 | $80.4M | Research |
| Bernina of America, LLC | Wholesale Trade | $4,190,000 | $4,246,232 | 283 | $86.7M | Research |
| Association for Individual Development | Other Services (except Public Administration) | $4,115,500 | $4,162,180 | 500 | N/A | Research |
| Vna Health Care | Health Care and Social Assistance | $4,053,500 | $0 | 362 | N/A | Research |
| First Centennial Mortgage Corporation | Finance and Insurance | $4,009,500 | $4,057,504 | 295 | $151.6M | Research |
| Signature Retail Services, Inc. | Administrative and Support and Waste Management | $3,554,000 | $3,599,180 | 448 | $84.7M | Research |
| Abbey Paving & Sealcoating Co. | Construction | $3,364,000 | $3,403,340 | 217 | $73.9M | Research |
| Olsson Roofing Company | Construction | $3,280,084 | $3,318,261 | 191 | $63.0M | Research |
| Unilock Chicago, Inc. | Manufacturing | $3,200,000 | $0 | 183 | $181.5M | Research |
| Atmi Precast, Inc. | Manufacturing | $3,024,305 | $3,060,429 | 257 | $254.9M | Research |
| State Mechanical Services, L.l.c. | Construction | $2,853,200 | $2,885,719 | 116 | $36.7M | Research |
| Geneva Constr. Co. | Manufacturing | $2,761,600 | $2,793,742 | 130 | $128.9M | Research |
| Rwi Holdings INC | Manufacturing | $2,567,207 | $1,522,450 | 127 | $33.3M | Research |
| Kane County Personnel INC | Administrative and Support and Waste Management | $2,293,515 | $2,288,182 | 392 | $61.7M | Research |
| Luse Thermal Technologies, LLC | Construction | $2,149,940 | $1,950,888 | 83 | $21.0M | Research |
| American Cable & Telephone, LLC | Professional, Scientific, and Technical Services | $2,092,587 | $2,120,721 | 267 | $37.4M | Research |
| Gripple Incorporated | Manufacturing | $2,000,000 | $2,021,808 | 170 | $44.5M | Research |
| Luse Thermal Technologies LLC | Construction | $2,000,000 | $1,353,662 | 281 | $89.6M | Research |
| National Metalwares, L.p. | Manufacturing | $1,943,900 | $1,962,529 | 134 | $35.1M | Research |
| National Metalwares L.p. | Manufacturing | $1,941,900 | $1,956,464 | 136 | $35.6M | Research |