| St. John the Baptist Diocesan High Schoo | Educational Services | $2,152,695 | $2,177,112 | 178 | N/A |  Research |
| Automall Hyundai LLC | Retail Trade | $1,816,652 | $1,837,208 | 126 | $31.8M | Research |
| Veterinary Medical Center of Long Island | Professional, Scientific, and Technical Services | $1,753,000 | $1,770,578 | 177 | $24.8M | Research |
| Js Autoworld LLC | Retail Trade | $1,269,187 | $1,282,748 | 300 | $75.6M | Research |
| Js Autoworld LLC | Retail Trade | $1,269,100 | $1,283,495 | 91 | $22.9M | Research |
| Jjm Atlantic Automotive LLC | Retail Trade | $1,255,627 | $1,269,456 | 84 | $21.2M | Research |
| Jjm Atlantic Automotive LLC | Retail Trade | $1,216,887 | $1,223,722 | 300 | $75.6M | Research |
| Action Store Fronts Inc. | Manufacturing | $622,305 | $627,895 | 33 | $8.1M | Research |
| Management Services Organization of South Shore, LLC | Health Care and Social Assistance | $610,000 | $617,721 | 88 | $27.6M | Research |
| Higbie Collision | Other Services (except Public Administration) | $590,000 | $303,299 | 26 | $5.1M | Research |
| Sunrise Imports, LLC | Retail Trade | $541,347 | $547,354 | 38 | $9.6M | Research |
| Medical Surgical Eye Care Services PC | Health Care and Social Assistance | $530,892 | $535,503 | 48 | $15.1M | Research |
| Medical Surgical Eyecare Services PC | Health Care and Social Assistance | $530,892 | $535,721 | 48 | $8.8M | Research |
| Island Gastroenterology Consultants PC | Health Care and Social Assistance | $509,190 | $516,919 | 43 | $13.5M | Research |
| Island Gastroenterology Consulting PC | Health Care and Social Assistance | $509,190 | $516,374 | 43 | $13.5M | Research |
| Atlantis Diner Corp | Accommodation and Food Services | $428,589 | $434,661 | 40 | $7.1M | Research |
| West Islip Youth Enrichment Services Incoprorated | Health Care and Social Assistance | $423,300 | $427,092 | 106 | $17.2M | Research |
| West Islip Youth Enrichment Services Incoprorated | Health Care and Social Assistance | $373,800 | $378,429 | 101 | $16.4M | Research |
| Great South Bay Surgical Associates and Vascular, Lab LLP | Health Care and Social Assistance | $366,250 | $369,111 | 26 | $8.2M | Research |
| Fredrick J Chapey&sons Funeral Home | Other Services (except Public Administration) | $365,330 | $367,422 | 31 | $5.9M | Research |
| Oakneck Holdings LLC | Accommodation and Food Services | $354,711 | $266,335 | 181 | $32.1M | Research |
| Brownstones Coffee Islip INC | Accommodation and Food Services | $349,975 | $351,997 | 44 | $7.8M | Research |
| Environmental Bulkheading Corp | Construction | $331,700 | $335,616 | 15 | <$5M | Research |
| The Bridges Academy | Educational Services | $297,952 | $301,196 | 31 | N/A | Research |
| Island Endoscopy Center LLC | Health Care and Social Assistance | $291,600 | $294,700 | 29 | $5.8M | Research |