Samsung Electro-Mechanics Co Ltd - to buy 319 bln won worth of shares in JV with Dongwoo Fine-Chem

Samsung Electro-Mechanics Co. Ltd. has announced plans to acquire shares valued at 319 billion won in a joint venture (JV) with Dongwoo Fine-Chem, a subsidiary of Sumitomo Chemical Group. The venture aims to manufacture "Glass Core," a critical material for next-generation semiconductor package substrates, as part of a broader strategy to address AI and HPC markets.

The companies signed a memorandum of understanding (MOU) on November 5, 2025, in Tokyo, with key executives from both organizations in attendance. Samsung Electro-Mechanics will hold a majority stake in the joint venture, while Sumitomo Chemical Group will serve as a minority shareholder. The companies are currently finalizing details such as the shareholding structure, business schedule, and corporate name, with plans to formalize the main agreement in the coming year.

The joint venture will be headquartered at Dongwoo Fine-Chem’s Pyeongtaek site, which will also serve as the initial production base for Glass Core. Samsung Electro-Mechanics is already producing glass package substrate prototypes at its Sejong plant pilot line, with mass production expected to begin after 2027.

The venture is positioned to leverage the technological strengths and global networks of all three partners to establish a robust supply chain for Glass Core, a material that offers superior thermal stability and flatness compared to conventional organic substrates. This collaboration is expected to play a pivotal role in shaping the future of advanced semiconductor packaging materials.