| Owner | Manager | From | Until | | Shenango Steamship & Transportation Company - Cleveland, Ohio, USA | | 1909/05 | 1957 |
| American Steamship Company - Buffalo, New York, USA | Boland & Cornelius - USA | 1957 | 1964/01 |
| Wilson Marine Transit Company - Cleveland, Ohio, USA | | 1964/01 | 1972 |
| Kinsman Marine Transit Company - Cleveland, Ohio, USA | | 1972 | 1975 |
| Robert Pierson Holdings Ltd. - Hamilton, Ontario, Canada | | 1975 | 1982/08 |
| P&H Shipping Ltd. - Mississauga, Ontario, Canada | | 1982/08 | 1984/05 |
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| Fleet | From | Until | | Shenango Furnace Company - Pittsburgh, Pennsylvania, USA | | 1957 |
| American Steamship Company - Buffalo, New York | | 1964/01 |
| Wilson Transit Company - Cleveland, Ohio | | 1972 |
| Kinsman Marine Transit Company - Cleveland, Ohio | | 1975 |
| Soo River Company - Mississauga, Ontario | | 1982 |
| P&H Shipping Company - Mississauga, Ontario | 1982 | 1984/05 |
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