Adderley Navigation Company Panama S.A. was formed in 1963. It was a type-C company mainly engaged in shipping and owner of the vessel Olympic Pride. 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.
Aguadilla Marine Panama S.A. was formed in 1973. It was a type-D company acting as financial representative.
Alameda Marine Panama S.A. was formed in 1968. It was a type-D company acting as financial representative.
Albany Finance Corporation was formed in 1976. It was a type-C company mainly acting as intermediate holding company. In 1976 it belonged to United Investments Panama S.A. and in 1988 to International Finance Panama S.A.. The company was bearer of shares of Athina Roussel patrimony. 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.
Alex. S. Onassis S.A. was formed in 1970. It was a type-G company acting as passive company.
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".
All Seas International S.A. was established in 1969. It was a type-C company mainly engaged in shipbuilding as shareholder of Harland & Wolf Shipyards.
Andes Financiera Maritima S.A. was formed in 1956. It was a type-C company mainly engaged in insurances. In 1966 owned shares of the Societe Des Forges & Chantiers de la Mediterranee and of the Societe Anonyme des Bains de Mer et du Cercle des Etrangers a Monaco. In 1969 owned 258.461 shares of British Petroleum Company. In 1970 owned 1.250 shares of the company Hellenic Ship & Aircraft Insurance Company S.A., which was founded in 1964. Before 1975 also owned Waaiagat & Jaymount Portfolio of F.C..M., B.P, Hellenic Ins. Shares. After 1975 it converted to a type-B company, acting as intermediate holding company and also engaged in real estate.