| Day Pitney LLP | Professional, Scientific, and Technical Services | $10,000,000 | $10,115,556 | 477 | $115.9M |  Research |
| Propark INC | Other Services (except Public Administration) | $10,000,000 | $10,223,014 | 500 | $95.5M | Research |
| Robinson & Cole LLP | Professional, Scientific, and Technical Services | $7,561,318 | $9,057,030 | 357 | $86.8M | Research |
| Shipman & Goodwin LLP | Professional, Scientific, and Technical Services | $6,560,222 | $6,634,631 | 320 | $77.8M | Research |
| The Connecticut Institute for the Blind Inc. | Health Care and Social Assistance | $6,000,000 | $6,047,014 | 500 | $85.1M | Research |
| Propark America West, LLC | Other Services (except Public Administration) | $5,355,870 | $5,430,705 | 500 | $95.5M | Research |
| The Village for Families & Children, Inc. | Health Care and Social Assistance | $5,199,315 | $5,259,000 | 495 | N/A | Research |
| Cantor Colburn LLP | Professional, Scientific, and Technical Services | $4,823,675 | $4,880,353 | 278 | $67.6M | Research |
| Woodland Anesthesiology Associates PC | Health Care and Social Assistance | $4,399,600 | $4,448,417 | 161 | $50.5M | Research |
| Church Homes INC Congregational | Health Care and Social Assistance | $4,350,809 | $4,398,608 | 472 | N/A | Research |
| Connecticut Gi PC | Health Care and Social Assistance | $4,236,667 | $4,284,565 | 349 | $109.5M | Research |
| Galena Associates, LLC | Other Services (except Public Administration) | $3,966,458 | $3,765,933 | 416 | $81.5M | Research |
| Jsc New England LLC | Accommodation and Food Services | $3,759,000 | $3,801,498 | 500 | $88.8M | Research |
| Orthopedic Associates of Hartford, P.c. | Health Care and Social Assistance | $3,724,000 | $3,774,402 | 250 | $78.5M | Research |
| Halloran & Sage LLP | Professional, Scientific, and Technical Services | $3,456,980 | $3,497,327 | 208 | $50.5M | Research |
| Meadowbrook Associates, LP | Other Services (except Public Administration) | $3,421,778 | $3,461,339 | 407 | $79.8M | Research |
| Catholic Charities INC - Archdiocese of Hartford | Health Care and Social Assistance | $3,120,000 | $2,789,522 | 407 | N/A | Research |
| Whittlesey PC | Professional, Scientific, and Technical Services | $2,900,600 | $2,976,577 | 150 | $47.7M | Research |
| Ymca of Metropolitan Hartford, Inc. | Other Services (except Public Administration) | $2,900,000 | $2,951,878 | 445 | $85.0M | Research |
| New Country Motor Cars, Inc. | Retail Trade | $2,583,397 | $2,284,730 | 184 | $46.4M | Research |
| Murtha Cullina LLP | Public Administration | $2,465,062 | $2,493,427 | 119 | N/A | Research |
| Harc INC | Health Care and Social Assistance | $2,428,670 | $2,463,004 | 417 | N/A | Research |
| All Waste Incorporated | Administrative and Support and Waste Management | $2,382,300 | $2,410,125 | 140 | $26.5M | Research |
| Collins Medical Associates 2, P.c. | Health Care and Social Assistance | $2,100,200 | $2,123,791 | 135 | $42.4M | Research |
| Beauty Enterprises, INC | Wholesale Trade | $2,037,657 | $2,059,987 | 232 | $59.7M | Research |