| Ai Engineers INC | Professional, Scientific, and Technical Services | $4,047,785 | $1,965,036 | 195 | $24.0M |  Research |
| Pieper Olson Veterinary Hospital PC | Professional, Scientific, and Technical Services | $3,041,300 | $3,080,379 | 325 | $45.5M | Research |
| The Connection, Inc. | Health Care and Social Assistance | $2,930,133 | $2,967,085 | 403 | N/A | Research |
| Middlesex Orthopedic Surgeons, P.c. | Health Care and Social Assistance | $2,681,695 | $2,714,096 | 90 | $16.0M | Research |
| Consulting Engineering Service INC | Professional, Scientific, and Technical Services | $2,205,532 | $2,230,712 | 104 | $12.8M | Research |
| Security Systems INC | Administrative and Support and Waste Management | $2,038,100 | $2,061,440 | 342 | $50.1M | Research |
| Connecticut Mason Contractors, Inc. | Construction | $2,000,000 | $2,796,042 | 100 | $10.8M | Research |
| Capasso Enterprises, Inc. | Construction | $1,918,013 | $1,936,299 | 90 | $9.7M | Research |
| Capassso Enterprises INC | Construction | $1,918,013 | $1,938,874 | 90 | $9.7M | Research |
| Ferazzoli Imports of New England, Inc. | Retail Trade | $1,714,000 | $1,724,588 | 136 | $28.1M | Research |
| The Homeaides,llc | Health Care and Social Assistance | $1,701,900 | $1,714,816 | 317 | $54.3M | Research |
| Connecticut Legal Services INC | Professional, Scientific, and Technical Services | $1,674,195 | $1,688,598 | 74 | N/A | Research |
| Mazene, Inc. | Professional, Scientific, and Technical Services | $1,312,870 | $1,324,596 | 189 | $19.6M | Research |
| Gilead Community Services. Inc. | Health Care and Social Assistance | $1,312,803 | $1,325,420 | 255 | N/A | Research |
| Lyman Products Corporation | Manufacturing | $1,278,000 | $1,286,753 | 112 | $29.3M | Research |
| Newtech Installation USA Inc. | Construction | $1,267,797 | $1,274,946 | 19 | $6.0M | Research |
| Newtech Installation USA Inc. | Construction | $1,267,797 | $1,281,426 | 19 | $6.0M | Research |
| Comprecare Health LLC | Health Care and Social Assistance | $1,259,250 | $1,270,240 | 105 | $24.3M | Research |
| Anesthesiologists of Middletown PC | Health Care and Social Assistance | $1,257,055 | $1,270,603 | 46 | $14.4M | Research |
| Anesthesiologists of Middletown, P.c. | Health Care and Social Assistance | $1,257,000 | $1,271,840 | 44 | $13.8M | Research |
| Edge Technology Services, Inc. | Professional, Scientific, and Technical Services | $1,241,822 | $1,256,241 | 81 | $16.8M | Research |
| The Professionals, LLC | Administrative and Support and Waste Management | $1,209,260 | $1,222,293 | 55 | $8.1M | Research |
| Mack Fire Protection, LLC | Construction | $1,204,700 | $1,218,430 | 86 | $27.2M | Research |
| Bourdon Forge Co., Inc. | Other Services (except Public Administration) | $1,192,112 | $1,203,641 | 96 | $20.6M | Research |
| Aerospace Techniques, INC | Manufacturing | $1,156,112 | $1,170,619 | 77 | $20.2M | Research |