| Owner | Manager | From | Until |
| Ritch & Smith Ltd. - Port Adelaide, Australia | | 1958/02 | 1968/01 |
| Adelaide Steamship Industries Pty. Ltd. - Port Adelaide, Australia | Ritch & Smith division of Adelaide Steamship Industries Pty. Ltd. | 1968/01 | 1978/01 |
| Abho Pty. Ltd. - Port Adelaide, Australia | | 1978/01 | 1979/01 |
| Ocean Survey & Studies Ltd. - Panama | | 1979/01 | 1980/01 |
| McAsphalt Industries Ltd. - Scarborough, Ontario, Canada | | 1980/01 | 1986/01 |
| Charpat Transportation Inc. - Toronto, Ontario, Canada | | 1986/01 | 1987/01 |
| Greater Sarnia Investment Corporation - Canada | Sandrin Brothers Ltd. | 1987/01 | 1992/04 |
| Lawebod Nigeria Ltd. - Lagos, Nigeria | Marine + Industrial Surveyors & Consultants (MISAC) | 1992/04 | 1993/10 |