| City Mechanical INC | Construction | $3,080,417 | $2,289,380 | 41 | $13.0M |  Research |
| Shields Nursing Centers | Health Care and Social Assistance | $1,920,232 | $1,932,073 | 147 | $25.0M | Research |
| Shields Nursing Centers INC | Health Care and Social Assistance | $1,491,208 | $1,509,351 | 174 | $29.6M | Research |
| Blize Healthcare California Inc. | Health Care and Social Assistance | $1,186,420 | $1,132,255 | 150 | $25.7M | Research |
| All Hands On Deck Incorporated | Administrative and Support and Waste Management | $1,113,100 | $0 | 73 | N/A | Research |
| Sharon Collins, Inc. | Real Estate and Rental and Leasing | $754,800 | $760,419 | 41 | $6.2M | Research |
| Murguia Wong Services, Inc. | Accommodation and Food Services | $702,065 | $709,144 | 167 | $29.7M | Research |
| Benda Tool & Model Works, Inc. | Manufacturing | $674,469 | $679,939 | 44 | $10.8M | Research |
| Benda Tool & Model Work Inc. | Manufacturing | $674,469 | $678,941 | 44 | $11.5M | Research |
| Aloha Seafood | Wholesale Trade | $444,745 | $449,253 | 42 | $10.8M | Research |
| Marvin Collins Construction | Construction | $439,895 | $444,453 | 21 | $23.9M | Research |
| Mega Creation, Inc. | Manufacturing | $397,355 | $400,113 | 280 | $277.7M | Research |
| Blize Healthcare California Inc. | Health Care and Social Assistance | $386,732 | $391,913 | 150 | $25.7M | Research |
| Aloha Seafood | Wholesale Trade | $384,482 | $388,095 | 31 | $8.0M | Research |
| Luk and Associates | Professional, Scientific, and Technical Services | $375,000 | $377,562 | 18 | <$5M | Research |
| Mega Creation Inc. | Wholesale Trade | $292,567 | $296,095 | 26 | $6.7M | Research |
| Valley Bible Church of Contra Costa County | Other Services (except Public Administration) | $285,300 | $287,852 | 35 | N/A | Research |
| Newman Lasik Centers a Medical Corporati | Health Care and Social Assistance | $258,099 | $260,425 | 13 | <$5M | Research |
| Pannu Financial Services | Finance and Insurance | $250,000 | $0 | 3 | <$5M | Research |
| Douglas Lin DDS INC | Health Care and Social Assistance | $232,567 | $235,007 | 25 | $5.8M | Research |
| Multiple Organics INC | Wholesale Trade | $223,340 | $225,052 | 13 | <$5M | Research |
| W.c. Drilling Inc. | Construction | $199,457 | $201,162 | 16 | <$5M | Research |
| Naia INC | Manufacturing | $196,813 | $198,119 | 21 | $7.4M | Research |
| Chahal & Associates Inc. | Professional, Scientific, and Technical Services | $194,800 | $197,116 | 17 | $5.4M | Research |
| A & B Die Casting Company Inc. | Manufacturing | $185,603 | $122,529 | 11 | <$5M | Research |