STX Engine Co., Ltd. engages in the manufacture of internal combustion engines. It operates through the following business divisions: Civilian, Special, and Electronic Communications. The Civilian business division offers marine, land development, and industrial engines. The Special business division provides army, navy, and coast guard defense industrial engines. The Electronic Communications business division offers naval radar, sonar, and communication systems. The company was founded on April 1, 2004 and is headquartered in Changwon-si, South Korea.