| United Community and Family Services, Inc. | Health Care and Social Assistance | $6,339,100 | $6,424,326 | 367 | N/A |  Research |
| The Norwich Free Academy | Educational Services | $4,512,860 | $4,563,923 | 324 | N/A | Research |
| The Arc Eastern Connecticut | Health Care and Social Assistance | $2,759,700 | $2,789,338 | 184 | N/A | Research |
| Norwich Inn & Spa LLC | Accommodation and Food Services | $1,814,110 | $1,836,080 | 115 | $36.0M | Research |
| Norwich Orthopedic Group P C. | Health Care and Social Assistance | $1,699,700 | $1,708,576 | 139 | $43.6M | Research |
| New London County Mutual Insurance Company | Finance and Insurance | $1,474,217 | $1,324,820 | 99 | $50.9M | Research |
| American Ambulance Service, Inc. | Health Care and Social Assistance | $1,401,032 | $1,408,862 | 148 | $34.3M | Research |
| Jacc Healthcare Center of Norwich, LLC | Health Care and Social Assistance | $1,089,200 | $1,103,195 | 108 | $18.4M | Research |
| Five Star Supermarkets of Norwich,inc. | Retail Trade | $996,227 | $0 | 221 | $55.2M | Research |
| Eastern Connecticut Hematology Oncology Associates, P.c. | Health Care and Social Assistance | $942,100 | $947,386 | 55 | $17.3M | Research |
| Levine Distributing Company, Inc. | Wholesale Trade | $908,700 | $703,889 | 49 | $12.6M | Research |
| The Nutmeg Companies, Inc. | Construction | $817,075 | $826,029 | 35 | $8.1M | Research |
| Ob-Gyn Services,p.c. | Health Care and Social Assistance | $742,300 | $747,022 | 44 | $13.8M | Research |
| Eastern Energy Services, LLC | Construction | $711,000 | $715,582 | 23 | $7.3M | Research |
| Eastern Energy Services, LLC | Construction | $701,900 | $634,045 | 46 | $14.6M | Research |
| Antonino 450 West Thames, Inc. | Retail Trade | $608,857 | $616,530 | 55 | $13.9M | Research |
| 500 West Thames Street, Inc. | Retail Trade | $552,365 | $559,326 | 52 | $13.1M | Research |
| Norwich Inn & Spa LLC | Accommodation and Food Services | $544,475 | $550,343 | 15 | <$5M | Research |
| The Norwich Roman Catholic Diocesan Corporation | Other Services (except Public Administration) | $536,100 | $540,580 | 101 | $19.3M | Research |
| Falvey's Motors INC | Retail Trade | $516,152 | $520,621 | 26 | $6.6M | Research |
| Yantic River Auto Supply Corp. | Wholesale Trade | $511,700 | $264,364 | 40 | $12.3M | Research |
| Norwich Ophthalmology Group P. C. | Health Care and Social Assistance | $506,900 | $511,462 | 42 | $13.2M | Research |
| Accurate Door and Window LLC | Manufacturing | $500,000 | $504,219 | 32 | $31.7M | Research |
| Norwich Ophthalmology Group, PC | Health Care and Social Assistance | $498,300 | $501,096 | 35 | $11.0M | Research |
| Scranton Chevrolet of Norwich | Retail Trade | $495,900 | $499,136 | 47 | $11.8M | Research |