Monrovia Transportation Company was formed in 1955. It was a type-C company mainly engaged in shipping and the owner of the vessel Olympic Challenger.
Montego Transportation Company was formed in 1973. It was a type-C company mainly engaged in shipping. It was a Liberian company without issued share capital. In 1979 - 1981 the vessel Olympic Star belonged to the company. In 1985 Olympic Star was sold to Ingleside Panama S.A. In 1991 Siverton Shipping Panama S.A. was the stockholder of the company.
Monterrey S.A. was formed in 1956. It was a type-C company mainly engaged in shipping and owner of the vessel Olympic Rider.
Occidental Carriers S.A. was formed in 1983. It was a type-C company mainly engaged in shipping as the owner of the vessel Olympic Melody.
The Oceanic Transport Corporation was formed in 1949. It is a type-C company engaged mainly in shipping. From 1950 it owned two vessels, General Artigas and General Rivera.
Omiros Maritima S.A. was formed in 1955. It was a type-C company mainly engaged in shipping.
Pinelands Marine Panama S.A. was formed in 1976. It was a type-B company mainly acting as intermediate holding company and parent of several other companies, such as Ashland Shipping Company S.A, Barrow Holding Corporation, Burnside Holding Corporation, Eton Finance Panama S.A., Peerless International S.A., Phoenix Shipping Company Panama S.A., Salvador Navigation Company Panama S.A. and Sherood Panama S.A. This new company was formed after the division of the Onassis assets and the restructuring of the companies to serve the needs of the Christina Onassis group, which was managed separately by OMSA and separately from the Alexander S. Onassis Foundation's companies
Redbank Shipping Company Panama S.A. was formed in 1961. It was a type-C company mainly engaged in shipping and owner of the vessel Olympic Games. 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.
Rosswell S.A. was formed in 1980. It was a type-D company mainly acting as intermediate agency.
Salvador Navigation Company Panama S.A. was formed in 1973. It was a type-G company acting as passive company.
Seacrest International Enterprises S.A. was formed in 1983. It was a type -C company. Bought a leasehold at 15 Grosvenor Square in March 1984 and sold it in July 1984. The company was dissolved in 2001
Sheridan Holding Inc. was formed in 1984. The company was the owner of the Nash House, London, and Everton Holding Corporation shareholders in 1993.
Sociedad Maritima San Martin S.A. was formed in 1951. It was a type-C 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.
Swansea Marine Panama S.A. was formed in 1956. It was a type-C company mainly engaged in shipping and owner of the vessel Olympic Breeze.
Transworld Trading Company S.A. was formed in 1956. It was a type-C company. It was an aviation company, (dormant). In 1976 undergoing change of ownership to Atol and A.S.O. equal holdings. In 1990 50% shares of the company belongs to A.S.O. and the other 50% belongs to Atol Group. In 1998 its parent company was Denton Marine Panama S.A.
Ultramar International Cargo Inc. was formed in 1960. It was a type-C company mainly engaged in shipping.
Union Shipping Co. Ltd. was formed in 1965. It was a type-C company mainly engaged in shipping.
United Investments Panama S.A. was formed in 1976. It was a type-D company mainly acting as intermediate agency in the field of cash management. It was the holding company of Athina Group of companies and owned several other companies such as Rhone Investments Limited (dividend from Corvallis), Evanston Panama S.A., Moreno Shipping Company and State Mercantile Company S.A. This new company was formed after the division of the Onassis assets and the restructuring of the companies to serve the needs of the Christina Onassis group, which was managed separately by OMSA and separately from the Alexander S. Onassis Foundation's companies.
United Marine Insurance Company Limited was formed in 1992. It was a type-E company acting as shipping agency.
Victory Development Corporation was formed in 1969 and it was a type-B company. It was the owner company of Olympic Towers. 50% of shares belong to Barillas Compania Naviera S.A. of the Christina Onassis Group. Sociedad Industrial Maritima Financiera Ariona Panama S.A. was 25% owner of Victory Shipping and Trading Inc. and the rest 75% was owned by Alexander and Christina Onassis in an agreement formed in 1958.
Watertow Transportation Company was formed in 1973. It was a type-G company acting as passive company