Sunstone Marine Panama S.A. was established in 1959. It was a type-C company mainly engaged in shipping and owner of the vessels "Federal" ("Adventurer" after 1963) and "Fort Bridger" ("Archer" after 1963). After 1975 Barillas Compania Naviera S.A. was the shareholder of the company. The company was dissolved in 1982.

Alexander S. Onassis Corporation was established in 1957. It was a type-C (and sometimes type-B company acting as intermediate holding company) mainly engaged in shipping. It was the owner of the vessels "Arickaree", "Battle Rock", "Camp Namanu", "Federal", "Fort Bridger", "Lake George", "McKittrick Hills", "Montebello Hills", "Republic", "Stony Point", "William A.M. Burden", "Heywood Broun", and "Lewis Emery Jr".