| Owner | Manager | From | Until |
| Indian Towing Company Inc. - USA | | 1951 | 1952 |
| Valentine Towing Corporation - USA | | 1952 | 1954 |
| Seaval Tugboat Corporation - USA | | 1954 | 1963 |
| Inland Towing Line Inc. - USA | | 1963 | 1969 |
| Wallin Marine Corporation - USA | | 1969 | 1970 |
| American Barge & Towing Company Inc. - USA | | 1970 | 1974 |
| Mansfield Equipment Company - USA | | 1974 | 1978 |
| Roger J. Au & Sons Inc. - USA | | 1978 | 1983 |
| Gaelic Tugboat Company - USA | | 1983 | 1993 |
| Holly Marine Towing Co. - USA | | 1993 | 1999 |
| Gaelic Tugboat Company - USA | | 1999 | 2006 |
| Zenith Tugboat Company - Duluth, Minnesota, USA | | 2006 | 2010 |
| Purvis Marine Ltd. - Sault Ste. Marie, Ontario | | 2010 | |