| The Haartz Corporation | Manufacturing | $7,609,782 | $7,709,343 | 380 | $99.5M |  Research |
| Rex Lumber Company | Wholesale Trade | $2,881,510 | $2,920,090 | 223 | $68.3M | Research |
| Acton Medical Associates, P.c. | Health Care and Social Assistance | $2,242,000 | $2,266,351 | 190 | $59.6M | Research |
| Psychemedics Corporation | Professional, Scientific, and Technical Services | $2,181,157 | $2,206,554 | 170 | $34.3M | Research |
| Mig Corporation INC | Construction | $2,123,695 | $2,150,772 | 77 | $23.9M | Research |
| Geocomp Corporation, Inc. | Professional, Scientific, and Technical Services | $2,008,900 | $2,040,657 | 103 | $12.7M | Research |
| Acton Medical Associates PC | Health Care and Social Assistance | $2,000,000 | $2,010,611 | 225 | $70.6M | Research |
| Onyx Corporaton | Transportation and Warehousing | $1,676,300 | $1,694,460 | 80 | $21.4M | Research |
| Associated Environmental Systems | Manufacturing | $1,468,297 | $1,477,352 | 95 | $26.5M | Research |
| Associated Environmental Systems, Inc. | Manufacturing | $1,380,000 | $1,387,437 | 95 | $24.9M | Research |
| Idylwilde Farm Inc. | Retail Trade | $1,213,357 | $1,229,712 | 145 | $16.1M | Research |
| Dmcp Group, LLC | Accommodation and Food Services | $1,199,700 | $1,211,897 | 263 | $46.7M | Research |
| Acton Lincoln Mercury | Retail Trade | $897,600 | $905,554 | 54 | $13.6M | Research |
| Acton Lincoln-Mercury Inc. | Retail Trade | $897,600 | $904,108 | 54 | $13.6M | Research |
| Thoughtforms Corporation | Construction | $850,000 | $858,028 | 49 | $14.9M | Research |
| Indoor Sports LLC | Arts, Entertainment, and Recreation | $817,000 | $824,700 | 338 | $47.3M | Research |
| Gordon Chevrolet, Inc. | Retail Trade | $778,898 | $797,165 | 66 | $16.6M | Research |
| Wintriss Controls Group LLC | Manufacturing | $770,077 | $772,494 | 37 | $9.7M | Research |
| Wintress Controls Group LLC | Manufacturing | $770,070 | $773,942 | 40 | $10.5M | Research |
| Indoor Sports LLC | Arts, Entertainment, and Recreation | $740,335 | $744,290 | 279 | $39.1M | Research |
| Payright Payroll Services INC | Professional, Scientific, and Technical Services | $711,700 | $726,053 | 40 | $5.6M | Research |
| Circle Furniture, Inc. | Retail Trade | $708,000 | $716,240 | 20 | <$5M | Research |
| Kistler & Knapp Builders, Inc. | Construction | $657,100 | $662,193 | 42 | $12.8M | Research |
| Santilli Enterprises INC | Retail Trade | $637,600 | $641,268 | 37 | $9.3M | Research |
| Santilli Enterprises INC | Retail Trade | $637,600 | $642,858 | 41 | $10.3M | Research |