West Shipping Corporation Panama S.A. was formed in 1956. It was a type-C company mainly engaged in shipping and the owner of the vessel Olympic Champion. After 1975 ASO Naviera Panama S.A was the sole shareholder of the company. The company was dissolved in 1983
Windsor Trading Corporation was formed in 1979. It was a type-C company mainly acting as intermediate holding company in the field of the vessel owing. It owned the vessel Olympic Fame. 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.
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Evanston Panama S.A. was fromed 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.
Falcon Marine S.A. was formed in 1959. It was a type-C company mainly engaged in shipping. In 1986 the company consolidated to A.S.O. Naviera Group, as from the forth clossing of accounts dated 31.12.1985. In 1990 the vessel Artemis Garofalidis belonged to A.S.O. Naviera Group.
Gardenton Corporation was a type -C company mainly engaged in real estate.