Overseas Shipholding Group, Inc. primarily engages in the ocean transportation of crude oil and petroleum products. As of December 31, 2014, the company owned or operated a fleet of 81 vessels aggregating 7.5 million deadweight tons and 864,800 cubic meters, which included 57 vessels operated in the international flag market and 24 operated in the United States (U.S.) flag market. Its customers comprise independent and state-owned oil companies, oil traders, refinery operators, and the U.S. and international government entities. Overseas Shipholding Group, Inc. was founded in 1948 and is headquartered in New York, New York.