 | The District of Thunder Bay Social Services Administration Board | thunder bay, ontario, canada | 49 | civic and social organizations | 1999 | |
 | Thunder Bay Truck Centre Inc | thunder bay, ontario, canada | 26 | truck transportation | 1977 | |
 | Fat Guys Auto Parts | thunder bay, ontario, canada | 25 | motor vehicle manufacturing | 2001 | |
 | mgm electric ltd. | thunder bay, ontario, canada | 19 | wholesale | 1987 | |
 | peterson machine & supply | thunder bay, ontario, canada | 11 | industrial machinery manufacturing | - | |
 | Bayside Geoscience | thunder bay, ontario, canada | 71 | mining | 2017 | |
 | Superior Hyundai | thunder bay, ontario, canada | 4 | motor vehicle manufacturing | 1983 | |
 | Rutas Eco turísticas De Colombia | Thunder Bay, ontario, canada | - | leisure, travel and tourism | - | |
 | nalu | thunder bay, ontario, canada | - | design | 2014 | |
| Viña Los Nogales | Thunder Bay, ontario, canada | 6 | leisure, travel and tourism | - | |
 | hockey northwestern ontario | thunder bay, ontario, canada | - | sports | 1915 | |
| Al Insaf Buses Transport | Thunder Bay, ontario, canada | 2 | leisure, travel and tourism | - | |
| Quiero viajar | Thunder Bay, ontario, canada | 4 | leisure, travel and tourism | - | |
 | sail superior.com big lake adventures & thunder bay harbour tours | thunder bay, ontario, canada | - | leisure, travel and tourism | 2000 | |
| machine safety services | thunder bay, ontario, canada | - | machinery | - | |
 | OZHI Professional Services | Thunder Bay, ontario, canada | - | architecture and planning | - | |
| ohm base hackerspace | thunder bay, ontario, canada | - | appliances, electrical, and electronics manufacturing | - | |
| generator advertising | thunder bay, ontario, canada | - | marketing and advertising | - | |
| letsgotravel.com.co | Thunder Bay, ontario, canada | - | leisure, travel and tourism | - | |
 | ce strategies | thunder bay, ontario, canada | - | information technology and services | 2010 | |
