| General Alum New England Corp | Manufacturing | $1,335,700 | $1,343,232 | 103 | $102.2M |  Research |
| Hamilton Marine, Inc. | Retail Trade | $987,100 | $992,447 | 207 | $54.1M | Research |
| Tozier's Family Market | Retail Trade | $245,920 | $247,539 | 46 | $11.5M | Research |
| Sundog Solar LLC | Manufacturing | $242,600 | $244,810 | 30 | $7.9M | Research |
| Penobscot Bay & River Pilots Association | Transportation and Warehousing | $111,495 | $84,024 | 4 | <$5M | Research |
| Penobscot Marine Museum | Arts, Entertainment, and Recreation | $110,456 | $110,911 | 8 | N/A | Research |
| Penobscot Marine Museum Maine's Oldest Maritime Museum | Arts, Entertainment, and Recreation | $110,400 | $111,430 | 8 | N/A | Research |
| Searsport Motor Company Inc. | Retail Trade | $108,500 | $109,302 | 8 | <$5M | Research |
| Searsport Veterinary Hospital | Professional, Scientific, and Technical Services | $91,246 | $91,806 | 9 | <$5M | Research |
| Penobscot Bay & River Pilots Association | Transportation and Warehousing | $83,333 | $83,874 | 4 | <$5M | Research |
| Coastal Steel Services LLC | Manufacturing | $72,100 | $72,595 | 7 | <$5M | Research |
| Searsport Automotive, LLC | Wholesale Trade | $66,740 | $67,274 | 8 | <$5M | Research |
| Neighborhood Belfast LLC | Accommodation and Food Services | $57,130 | $57,522 | 6 | <$5M | Research |
| American Landmark Companies INC | Professional, Scientific, and Technical Services | $55,500 | $55,983 | 6 | <$5M | Research |
| Maine Fuels, Inc. | Mining, Quarrying, and Oil and Gas Extraction | $44,695 | $45,043 | 5 | <$5M | Research |
| Bog Hill Woodworking LLC | Construction | $44,585 | $44,893 | 6 | <$5M | Research |
| American Landmark Companies INC | Professional, Scientific, and Technical Services | $43,785 | $44,213 | 6 | <$5M | Research |
| Judsoncolby Real Estate LLC | Real Estate and Rental and Leasing | $41,600 | $41,843 | 2 | <$5M | Research |
| Joel Ploszaj | Real Estate and Rental and Leasing | $41,310 | $41,564 | 3 | <$5M | Research |
| Neighborhood Belfast LLC | Accommodation and Food Services | $40,807 | $41,152 | 6 | <$5M | Research |
| Andrews Trucking LLC | Construction | $38,738 | $38,891 | 5 | <$5M | Research |
| Rosebud Enterprises INC | Transportation and Warehousing | $37,810 | $38,229 | 2 | <$5M | Research |
| Blue Jacket Shipcrafters, LLC | Manufacturing | $32,400 | $32,549 | 7 | <$5M | Research |
| Searsport Shores Ocean Company LLC | Accommodation and Food Services | $31,500 | $31,830 | 9 | <$5M | Research |
| Blacktop Paving by F Cameron Paving and Son LLC | Construction | $25,100 | $25,314 | 5 | <$5M | Research |