| Happy Mountains LLC | Health Care and Social Assistance | $3,121,015 | $3,158,034 | 260 | $81.6M |  Research |
| E-Center INC | Administrative and Support and Waste Management | $1,611,000 | $1,633,466 | 157 | $29.7M | Research |
| E Center INC | Unknown | $1,611,000 | $1,626,624 | 252 | N/A | Research |
| Imperial Electronic Assembly, INC | Manufacturing | $1,005,200 | $1,012,152 | 95 | $24.9M | Research |
| J Iapaluccio INC | Construction | $999,157 | $1,010,326 | 60 | $22.5M | Research |
| J Iapaluccio INC | Construction | $999,157 | $1,007,944 | 55 | $17.0M | Research |
| Alcaide, Inc. | Construction | $924,600 | $933,153 | 68 | $21.1M | Research |
| United Roofing & Sheet Metal INC | Construction | $814,300 | $823,483 | 52 | $17.1M | Research |
| Regional Young Men's Christian Association of Western Connec | Other Services (except Public Administration) | $802,582 | $808,607 | 232 | N/A | Research |
| Nordex, Incorporated | Manufacturing | $796,532 | $802,337 | 56 | $15.6M | Research |
| Regional Young Men's Christian Association of Western Connec | Finance and Insurance | $795,980 | $801,148 | 234 | N/A | Research |
| Great Point LLC | Health Care and Social Assistance | $715,500 | $725,259 | 230 | $39.4M | Research |
| Orthopaedic Specialists of Connecticut | Health Care and Social Assistance | $669,031 | $673,723 | 42 | $9.7M | Research |
| Orthopaedic Specialists of Connecticut, PC | Health Care and Social Assistance | $642,400 | $649,528 | 45 | $10.4M | Research |
| Corporate Construction INC | Construction | $610,265 | $615,900 | 42 | $47.9M | Research |
| United Alarm Services, INC | Professional, Scientific, and Technical Services | $586,100 | $590,227 | 38 | $5.3M | Research |
| Spencer Road LLC | Professional, Scientific, and Technical Services | $427,588 | $430,833 | 22 | <$5M | Research |
| Cultec INC & Robert J Ditullio | Manufacturing | $416,700 | $420,659 | 29 | $28.8M | Research |
| The Waterview LLC | Accommodation and Food Services | $413,735 | $416,596 | 157 | $29.3M | Research |
| La Pietra Thinstone Veneer of Monroe Inc. | Manufacturing | $413,232 | $418,225 | 25 | $6.5M | Research |
| La Pietra Thinstone Veneer of Monroe Inc. | Manufacturing | $413,200 | $418,824 | 25 | $6.5M | Research |
| Target Flavors, Inc. | Manufacturing | $407,300 | $536,862 | 26 | $9.2M | Research |
| Ha Group LLC | Accommodation and Food Services | $390,202 | $395,199 | 20 | <$5M | Research |
| Country Kids Play Farm, Inc. | Health Care and Social Assistance | $379,100 | $383,712 | 70 | $11.3M | Research |
| Ab Electronics INC | Manufacturing | $369,900 | $371,726 | 36 | $9.4M | Research |