Corrientes Sociedad Maritima S.A. was established in 1951. It was a type-C company mainly engaged in shipping and owner of the vessel "Olympic Mariner".
Panamerican Marine Corporation was established 1951. It was a type-D (aunt) company mainly engaged in chartering as intermediary representative.
Olympic Transportation Company was established in 1952. It was a type-C company mainly engaged in shipping and owner of the vessel "Olympic Mountain".
Montserrado Transportation Company was established in 1953. It was a type-C company mainly engaged in shipping and owner of the vessel "Olympic Splendour".
Chester Navigation Company S.A. was established in 1957. It was a type-C company mainly engaged in shipping and owner of the vessel "Olympic Cloud".
Howland Panama S.A. was established in 1966. It was a type-C company mainly engaged in shipping and owner of the vessel "Olympic Progress". In 1986 the company sold the vessel "Olympic Progress".
Ingleside Panama S.A. was established in 1967. It was a type-C company mainly engaged in shipping and owner of the vessel "Olympic Ambition". The vessel was sold in 1981.
Hawkesbury Shipping Panama S.A. was established in 1970. It was a type-B company acting as intermediate holding company. In 1981 also acted as intermediate holding company. In 1991 all the shares transferred to Silverton Shipping Panama S.A.
Tacapan Marine Panama S.A. was established in 1973. It was a type-C company mainly engaged in shipping. The company was dissolved in 1993.
Pennine Navigation Company S.A. was established in 1983. It was a type-C company mainly engaged in shipping as the owner of the vessel "Olympic Merit".
Plate Marine S.A. was established in 1951. It was both a type-C and a type-E company mainly engaged in tourism. It was one of the companies that between 1951-1959 purchased shares of the Société des Bains de Mer and eventually took control of the company that owned Monaco’s most important businesses: the Casino, the Opera House and the famous Hôtel de Paris. Also, it was the company that was responsible for supplies and parts for ships and aircraft. After 1975 the company passed to the Christina Onassis Group of companies owned by ATOL and managed by OMSA. After 1999 the ownership of Christina Onassis Group of Companies passed to her daughter Athina Onassis. The management of the companies was still held, separately from the Alexander S. Onassis Foundation Companies, until 1999. The company was dissolved in 2000.
Portamar Navigation Company Panama S.A. was established in 1963. It was a type-C company mainly engaged in shipping and owner of the vessel "Olympic Goal".
Obelisk Navigation S.A. was established in 1986. It was a type-C company mainly engaged in shipping as the owner of the vessel "Olympic Loyalty".
Milford Navigation Company Panama S.A. was established 1963. It was a type-C company mainly engaged in shipping and owner of the vessel "Olympic Glory". In 1963 Carolus S.A. was the registered agent. In 1981 A.S.O. Naviera Panama S.A. was the parent company. The vessel "Olympic Glory" was sold in 1983 to Sangyong Corporation of Seoul.
Rossway Transportation Company was established in 1973. It was a type-C company mainly engaged in shipping.
Atol Compania Naviera S.A. was established in 1975. It was a type-A holding company and the main company of Christina Onassis Group, that owned the majority of the shares of the other companies of the group.
Evanston Panama S.A. was established in 1974. It was a type-D company mainly acting as intermediate agency. It belonged to United Investment Panama S.A. and after some years to Corvallis Navigation Panama S.A. After 1975 the company passed to the Christina Onassis Group of companies owned by ATOL and managed by OMSA. After 1999 the ownership of Christina Onassis Group of Companies passed to her daughter Athina Onassis. The management of the companies was still held, separately from the Alexander S. Onassis Foundation Companies, until 1999. The company was dissolved in 2001.