Overseas Shipholding Group, Inc. engages in the provision of energy transportation services for crude oil and petroleum products in the U.S. Flag trade. It operates Articulated Tug Barges (ATB), lightering ATBs, shuttle tankers, Medium Range (MR) tankers, and non-Jones Act MR tankers that participate in the maritime security program. The company was founded in 1948 and is headquartered in Tampa, FL.