Sander Marine Panama S.A. was established in 1969. It was a type-C company mainly engaged in shipping. The company was the owner of the motor yacht "Caroline" until 1977.
Sandiland Marine Panama S.A. was formed in 1973. It was a type-B (or type-C) company acting as intermediate holding company.
Santa Rosa Shipping Company Panama S.A. was formed in 1963. It was a type-C company mainly engaged in shipping.
Saudi Arabian Tankers Company Limited was formed in 1954. The company was founded in order to implement the famous agreement between Saudi Arabia and Aristotle Onassis, which turned the United States, the Northern European countries and the oil companies against him. The company operated a tanker, the Al-Malik Saud Al Awal, between 1954 and 1959, but in the end the agreement was never implemented and, after the final judgement of the International Court of Justice in The Hague in 1958, which declared the agreement invalid, it was dissolved.
Seabrook Shipping Company Panama S.A. was established in 1956. It was a type-C company mainly engaged in shipping and owner of the vessel "Olympic Rock". The company was dissolved in 1983.
Seacrest International Enterprises S.A. was established 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.
Seaford Marine S.A. was established in 1957, as a type-C daughter company. It owned the vessel "Olympic Flame" (1948-1972). 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.
Seaforth International Corporation was formed in 1977. It was a type-D company mainly acting as intermediate agency. It was responsible for collecting the freights of certain vessel-owning companies.
Seawell Marine Panama S.A. was established in 1963. It was a type-C company mainly engaged in shipping and owner of the vessel "Olympic Garland".
Severna Shipping Panama S.A. was established in 1980. It was a type-C company mainly engaged in shipping as the owner of the vessel "Olympic Liberty", which was built in 1983 and sold in 1988.
Shelby Navigation Panama S.A was established in 1965. It was a type-C company mainly engaged in shipping.
Shelton Transportation Company was established in 1973. It was a type-G company acting as passive company.
Sheridan Holding Inc. was formed in 1984. The company was the owner of the Nash House, London, and Everton Holding Corporation shareholders in 1993.
Sherood Panama S.A. was formed in 1976. It was a type-C company, engaged in real estate. 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. In 1998 owner of the first floor of a building located at Avenue Foch, Paris, parent company Pinelands Marine Panama S.A.