Ruen Holding AD is a holding company, which engages in the acquisition, management, evaluation and sale of shares in Bulgarian and foreign companies. It also participates in the acquisition, evaluation and sale of patents; the granting of licenses for the use of patents to companies in which the company participates in; the conducting of group excavation, construction, provision of reclamation and liquidation services; and the transport and extraction of raw materials and minerals. The company was founded on October 30, 1996 is headquartered in Kyustendil, Bulgaria.