Qingdao Doublestar Co., Ltd (000599.SZ) manufactures and sells tires primarily under the Doublestar Tire brand in China and internationally; its core products include all-steel radial tires for trucks and buses, semi-steel radial tires for passenger cars, and engineering tires for giant mines; the company also engages in intelligent equipment and green ecological new materials. Founded in 1921 and headquartered at No. 666 Lianghe Road, Huangdao District, Qingdao, China, it operates as the only state-owned listed tire company in Shandong Province following a 2008 restructuring that shifted focus from shoes and clothing to tires. Recent major developments include acquiring a 45% controlling stake in South Korea's Kumho Tire for approximately RMB 3.9 billion in July 2024 to integrate global production capacity and enhance market share, purchasing 100% of Shandong Hengyu Technology Co., Ltd for RMB 899 million in 2025 to upgrade high-end tire facilities, and implementing mixed ownership reform in July 2020 as Qingdao's first state-owned enterprise to transition from wholly state-owned status.