| Orthopaedic Specialty Group | Health Care and Social Assistance | $3,650,000 | $3,455,603 | 244 | $76.6M |  Research |
| Acme United Corporation | Manufacturing | $3,508,047 | $3,546,246 | 335 | $81.9M | Research |
| Prosek LLC | Unknown | $3,169,895 | $3,304,160 | 177 | N/A | Research |
| Carolton Chronic & Convalescent Hospital Incorporated | Health Care and Social Assistance | $2,928,800 | $2,969,803 | 288 | $49.0M | Research |
| Herbert J. Sims & Co. | Finance and Insurance | $2,689,980 | $2,726,594 | 133 | $68.3M | Research |
| Rehabilitation Associates of Connecticut Inc. | Health Care and Social Assistance | $2,248,700 | $2,267,059 | 176 | $47.5M | Research |
| Orthopaedic Specialty Group PC | Health Care and Social Assistance | $2,000,000 | $2,020,500 | 244 | $76.6M | Research |
| Colony Grill Development LLC | Accommodation and Food Services | $2,000,000 | $2,011,123 | 207 | $36.8M | Research |
| Rehabilitation Associates INC | Health Care and Social Assistance | $1,755,204 | $1,766,745 | 126 | $22.4M | Research |
| Rehabilatation Associates Inc. | Health Care and Social Assistance | $1,744,700 | $1,755,216 | 129 | $34.8M | Research |
| Colony Grill Development LLC | Accommodation and Food Services | $1,513,700 | $1,526,058 | 189 | $33.6M | Research |
| Gastroenterology Associates of Fairfield, P.c. | Health Care and Social Assistance | $1,491,615 | $1,504,365 | 112 | $35.2M | Research |
| Gastroenterology Associates of Fairfield P.c. | Health Care and Social Assistance | $1,491,615 | $1,504,243 | 115 | $36.1M | Research |
| Bnp Associates, Inc. | Professional, Scientific, and Technical Services | $1,346,900 | $1,516,865 | 65 | $8.0M | Research |
| Scap Motors, Inc. | Retail Trade | $1,242,300 | $1,251,762 | 90 | $22.7M | Research |
| Socal Silver King, LLC | Accommodation and Food Services | $1,087,746 | $1,057,495 | 96 | $17.0M | Research |
| The Fairfield Country Day School Corporation | Educational Services | $1,000,092 | $1,011,200 | 50 | N/A | Research |
| Shamrock of New England, Inc. | Administrative and Support and Waste Management | $985,400 | $998,305 | 277 | $60.0M | Research |
| The Fairfield Country Day School Corporation | Educational Services | $981,617 | $988,004 | 80 | N/A | Research |
| Notre Dame Catholic High School INC | Educational Services | $921,385 | $933,376 | 57 | N/A | Research |
| Kids First Pediatric Dentistry and Orthodontics P.c. | Health Care and Social Assistance | $885,262 | $897,090 | 75 | $17.4M | Research |
| The Patterson Club. INC | Arts, Entertainment, and Recreation | $817,005 | $0 | 57 | N/A | Research |
| Ceruzzi Properties, LLC | Real Estate and Rental and Leasing | $793,300 | $622,536 | 30 | <$5M | Research |
| Notre Dame Catholic High School, Inc. | Educational Services | $754,500 | $763,740 | 53 | N/A | Research |
| Quentin Medical Group, LLC | Health Care and Social Assistance | $736,565 | $743,325 | 76 | $23.9M | Research |