The company was created in 1948. It is a type-C company, mainly engaged in shipping.
Maryland Limited S.A. was establishd in 1956. It was a type-C company mainly engaged in shipping and owner of the vessel "Olympic Rainbow".
Mayflower Marine S.A. was formed in 1956. It was a type-B company mainly acting as an intermediate holding company. 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.
Medford Panama S.A., was formed in 1976. It was a type-B company, acting as an intermediate holding company, mainly engaged in cash management. In 1990 the company belongs to Atol Group.
Melbury Shipping Company Panama S.A. was established in 1963. It was a type-C company mainly engaged in shipping and owner of the vessel "Olympic Phaethon".
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.