[Basic Information]

• Company Name: Mitsui Kinzoku Company, Limited (formerly Mitsui Mining & Smelting Co., Ltd.)
• Established: May 1, 1950
• Headquarters: Gate City Ohsaki West Tower, 1-11-1 Osaki, Shinagawa-ku, Tokyo, Japan
• Representative: Takeshi Nou, President and Representative Director
• Capital: 42,289 million yen
• Number of Employees: 12,097 (Consolidated), 2,473 (Non-consolidated)

[Core Businesses] As a comprehensive materials manufacturer with a strong foundation in non-ferrous metals, the company primarily operates in the following segments:

• Engineered Materials Business: Development and provision of high-value-added advanced materials, including ultra-thin copper foil for semiconductor package substrates, battery materials for hybrid vehicles, exhaust gas purification catalysts, functional powders for electronic materials, and ceramic products.
• Metals Business: Smelting of non-ferrous metals such as zinc, lead, copper, gold, and silver, alongside an advanced resource recycling business (recovering valuable metals) that leverages its extensive smelting network. (Note: The automotive parts business, primarily automotive door locks handled by Mitsui Kinzoku ACT, was completely sold off in November 2025 as part of portfolio optimization.)

[Corporate Purpose] "By combining an exploratory spirit and diverse technologies, we bring smiles to the Earth." Drawing on its long-cultivated "exploratory spirit" and "fusion of diverse technologies," the company aims to realize a sustainable society by developing materials with a low environmental impact and contributing to a circular economy.

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