| Owner | Manager | From | Until | | Herbert T. Dunn Sr. - Canada | | 1938 | 1953 |
| Ralph A. Glover Sr. - Canada | | 1953 | 1965 |
| Arthur L. Grayling - Canada | | 1965 | 1973 |
| James H. Misner - Canada | | 1973 | 1975 |
| Henry H. Misner - Port Dover, Ontario, Canada | | 1975 | 1996 |
| Nadro Marine Services Ltd. - Port Dover, Ontario | | 1996 | 2008 |
| ASI Group Ltd. - Stoney Creek, Ontario, Canada | | 2008 | |
|
| Fleet | From | Until | | Nadro Marine Services - Port Dover, Ontario | 1996 | 2008 |
|