TransAtlantic Lines LLC is an American shipping company based in Greenwich, Connecticut. The limited liability company was founded in 1998 by vice-president Gudmundur Kjaernested and president Brandon C. Rose. The company owns and operates 5 vessels, including one tug-and-barge combination. Four of these vessels are chartered by the Military Sealift Command, and perform duties such as delivering cargo to U.S. military activities in Diego Garcia.