Overseas Shipholding Group, Inc. and its subsidiaries constitute a major international shipping enterprise owning and operating a diversified fleet of oceangoing bulk cargo vessels -- principally tankers. The company ranks among the world''s largest owners of tankers both in terms of the number of vessels and in carrying capacity. The company charters its ships to commercial shippers and U.S. and foreign governmental agencies for the carriage of bulk commodities, primarily crude oil, petroleum products, grain, coal and iron ore.