| Owner | Manager | From | Until | | Pioneer Steamship Company - Cleveland, Ohio, USA | Hutchinson & Company - USA | 1943/07 | 1962/01 |
| Oglebay Norton Company - Cleveland, Ohio, USA | | 1962/01 | 1987/12 |
|
| Fleet | From | Until | | United States Maritime Administration | 1942/03/16 | 1943/07/19 |
| Pioneer Steamship Company - Cleveland, Ohio | 1943/07 | 1962/01 |
| Columbia Steamship Company - Cleveland, Ohio | 1962/01 | 1987/12 |
|