Established in December 2005 and registered in the Dagushan area of ​​the Dalian Economic and Technological Development Zone, Dalian Yisheng Investment Co., Ltd. has a registered capital of 2.018 billion RMB. Its ownership structure consists of a 70% stake held by Rongsheng Petrochemical and a 30% stake held by Hengyi Petrochemical. The company serves as the core investment and holding platform for the "Yisheng" business segment, jointly established by its two major shareholders, Hengyi and Rongsheng. Its primary business scope encompasses equity investment in petrochemical projects, domestic general trade, the import and export of goods and technologies, and trade agency services. The company does not engage directly in the manufacturing of chemical products; instead, it focuses on capital operations and industrial investment strategy.

As the primary investment vehicle for the Yisheng industrial cluster, Dalian Yisheng Investment holds a controlling interest in Yisheng Dahua Petrochemical and maintains equity stakes in other core production enterprises, such as Hainan Yisheng Petrochemical. It connects major coastal production bases in Dalian and Hainan, overseeing the integration of industrial resources among shareholders, project capital increases, and long-term capital planning. Furthermore, it drives capacity expansion and cross-regional synergy for the Yisheng PTA and PET polyester segments. Leveraging the extensive industrial expertise of its shareholders in the petrochemical sector, the company plays a pivotal role in project initiation, capital procurement, and risk management. It coordinates strategic planning across production sites, bridges the petrochemical industrial footprint between northern and southern coastal regions, and provides essential capital-level support to the production enterprises within the Yisheng ecosystem.