| Owner | Manager | From | Until | | Producers Steamship Company - Cleveland, Ohio, USA | M.A. Hanna & Company - USA | 1917/10 | 1937/02 |
| National Steel Corporation - Cleveland, Ohio, USA | | 1937/02 | 1955 |
| Wilson Transit Company - Cleveland, Ohio, USA | | 1955 | 1957/01 |
| Republic Steel Corporation - Cleveland, Ohio, USA | Wilson Marine Transit Company - USA | 1957/01 | 1971/02 |
| Kinsman Marine Transit Company - Cleveland, Ohio, USA | | 1971/02 | 1975/01 |
| Robert Pierson Holdings Ltd. - Hamilton, Ontario, Canada | | 1975/01 | 1982/08 |
| P&H Shipping Ltd. - Mississauga, Ontario, Canada | | 1982/08 | 1984/12 |
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| Fleet | From | Until | | Kinsman Marine Transit Company - Cleveland, Ohio | 1971/02 | 1975/01 |
| Soo River Company - Mississauga, Ontario | 1975/01 | 1982/08 |
| P&H Shipping Company - Mississauga, Ontario | 1982/08 | 1984/12 |
|