Mitsubishi Materials Corporation

Iwasaki, who started the shipping business as Kyuju Trading Company in 1870, actively expanded into coal mine and quarry management, which developed into one of the core businesses promoted by Mitsubishi.

Iwasaki, who started the shipping business as the Ninety‑Nine Trading Company, also actively expanded into coal mining and mining operations, which developed into one of the core businesses promoted by Mitsubishi.

In 1871 (Meiji 4), Kyuju Trading Company (the predecessor of Mitsubishi Shokai) leased coal mines in Kishu Shingu Domain and entered the mining industry.

The Ninety‑Nine Trading Company (the predecessor of Mitsubishi Trading Company) leased a coal mine in the Kishu Shingu Domain and entered the mining sector.

In 1873 (Meiji 6), Mitsubishi Shokai (the predecessor of Mitsubishi Goshi Kaisha) acquired Yoshioka Mine and entered the metal mining business.

Mitsubishi Trading Company (the predecessor of Mitsubishi Joint Stock Company) acquired Yoshioka Mine and entered the metal mining business.

In 1893 (Meiji 26), Mitsubishi Goshi Kaisha was established.

Established Mitsubishi Joint Stock Company.

In 1896 (Meiji 29), it received the disposal of Osaka Smelting Works from the Imperial Household Ministry and entered the metal refining business.

Received the transfer of the Osaka Refinery from the Ministry of the Interior and entered the metal smelting business.

In 1917 (Taisho 6), Seto Inland Sea's direct island was operated as Mitsubishi's central refining plant by Mitsubishi Kogyo, producing various metals including copper supporting Japan's modernization for over 90 years.

In 1917 (Taisho 6), the Mining Research Institute (now the Central Research Institute) was established, and the Naoshima Smelting Plant was set up.

1917: Began operations on Naoshima in the Seto Inland Sea as Mitsubishi's central smelter under a Mitsubishi joint venture, producing iron, copper, and other metals that support Japan's modernization for over 90 years.

Established the Mining Research Institute (now Central Research Institute). Established the Naojima Refinery.

1918 (Taisho 7): Mitsubishi Mining Co., Ltd. was established, inheriting the coal mining department, mining department, and research institute from Mitsubishi Joint-Stock Company.

Established Mitsubishi Mining Co., Ltd., inheriting the coal mining, mining, and research institute divisions from Mitsubishi Joint Stock Company.

The Toyokuni Cement Kanda Plant, which started operation in 1920 (Taisho 9). Post-war, it developed into Japan's top cement factory through partnerships and mergers with Mitsubishi Cement Co., Ltd. (a subsidiary of Mitsubishi Kogyo), which entered the cement industry, and was renamed in 1994.

1920 (Taisho 9): The Kiyota Factory (now Kyushu Factory, then Toyokuni Cement Co., Ltd.) was established. Cement production began.

Established the Karita Plant (now Kyushu Plant, formerly Toyokuni Cement Co., Ltd.) and began cement production.

1921 (Taisho 10): Mitsubishi Mining Co., Ltd. listed its shares on the Tokyo Stock Exchange.

Mitsubishi Mining Co., Ltd. listed its shares on the Tokyo Stock Exchange.

A panoramic view of the Seto Island refinery in the 1930s (Showa era).

Celebrating its 80th anniversary this year, the Senzu Metal Mining Co., Ltd., acquired the Kotobuki Mine in Kurihara-gun, Miyagi Prefecture, in 1934 (Showa 9). It grew into a top-class lead and zinc mine in Japan using advanced mining technology. It closed in 1987 due to tough economic conditions post-war, including yen appreciation.

1934 (Showa 9): Acquired Sekiguchi Metal Mining Co., Ltd. (formerly Kyori Mining Co., Ltd.) located in Utsunomiya Village, Kurihara District, Miyagi Prefecture, which became the 80th anniversary this year. Through large‑scale development using top‑tier mining technology, it grew into one of Japan's leading lead and zinc mines. After the war, a difficult operating environment due to the yen’s appreciation led to its closure in 1987. Since then, it has contributed to building a circular society by focusing on lead recovery from automotive waste batteries.

1938 (Showa 13): Established Tohoku Fertilizer Co., Ltd. to supply chemical fertilizers to agriculture in the Tohoku region, and in 1959 founded Nippon Electronic Metal Co., Ltd. with foresight that the era of semiconductor metals was coming. The two companies integrated to adapt to drastic changes in industrial structure and business environment, supplying high‑performance fine materials for semiconductor-related applications and contributing to a prosperous society.

1942 (Showa 17): The Tokyo Metal Works (now Tsukuba Manufacturing) was established, marking a serious entry into the cutting tool business.

Established the Tokyo Metal Industry (now Tsukuba Manufacturing) and fully entered the cutting tool business.

1944 (Showa 19): At the Niigata Metal Works (now Diamond Metal Co., Ltd.), mass production of powdered metallurgy products began.

Started mass production of powder metallurgy products at Niigata Metal Industry (now DiaMet Co., Ltd.).

1950 (Showa 25): Under the Concentration and Elimination Act, the coal (Mitsubishi Mining Co., Ltd.) and metal (Taiei Mining Co., Ltd.) divisions were separated.

Under the Concentrated Exclusion Law, the coal (Mitsubishi Mining Co., Ltd.) and metal (Taihei Mining Co., Ltd.) divisions were separated.

In April 1950 (Showa 25), Taihe Mining Co., Ltd., which separated from Mitsubishi Mining Co., Ltd. (the predecessor of our company) under the Law for the Elimination of Excessive Concentration of Economic Power, was established to build a major building (later Mitsubishi Metal Building). It was renamed Mitsubishi Material Real Estate Co., Ltd. in 2004.

In April 1950, Taiei Mining Co., Ltd. (the predecessor of our company, which separated from Mitsubishi Mining Co., Ltd. under the Excessive Economic Power Concentration Elimination Act) and later renamed Mitsubishi Metal Mining Co., Ltd. in 1952, established Dai-Tei Real Estate Co., Ltd. in June 1950 for the purpose of owning and managing the large building (later renamed Mitsubishi Metal Building) that was built for the company. The company was renamed Mitsubishi Material Real Estate Co., Ltd. in 2004.

1952 (Showa 27): Taiei Mining Co., Ltd. changed its name to Mitsubishi Metal Mining Co., Ltd.

Taihei Mining Co., Ltd. changed its corporate name to Mitsubishi Metal Mining Co., Ltd.

In 1953 (Showa 28), Mitsubishi Metal Mining Co., Ltd., (our predecessor) established the Akita Refinery in Ibaraki, Akita City, to meet post-war zinc demand. It used abundant electricity to produce high-quality electrical zinc and grew significantly.

In 1953, Mitsubishi Metal Mining Co., Ltd. (the predecessor of our company) established the Akita Smelter in Akita City and Ibarajima to meet postwar zinc demand, gathering the latest technology. Using abundant electricity, it produced high‑quality electric zinc and grew rapidly, but from the 1980s faced rising power costs and falling metal prices, leading to the cessation of production in 1996.

1954 (Showa 29): Mitsubishi Cement Co., Ltd. was established, entering the cement business.

In 1954, Mitsubishi Mining Co., Ltd. (the predecessor of our company) entered the cement business as part of diversification. Entering the Kanto market, the largest domestic demand region, was an important strategy from the outset. However, infrastructure development took time, and in 1969 the company launched a model cement plant that combined cutting‑edge technology to achieve pollution‑free and labor‑saving production. It continues to challenge technological innovation at the forefront of the era, contributing to people, society, and the planet.

Mitsubishi Cement Co., Ltd. was established. Entered the cement business.

In June 1954, the opening ceremony was held.

In 1958 (Showa 33), the Iwate Plant was started by Tohoku Development Co., Ltd., a government-affiliated company promoting regional development, to produce and supply cement using locally abundant limestone resources.

1959 (Showa 34): Japan Electronic Metal Co., Ltd. was established, entering the high-purity silicon business for semiconductors.

Japan Electronic Metal Co., Ltd. was established. Entered the high-purity silicon business for semiconductors.

In 1962 (Showa 37), Mitsubishi Aluminum Co., Ltd. was launched as an aluminum rolling manufacturer through technology transfer from Reynolds of the United States.

1962 (Showa 37): Mitsubishi Reynolds Aluminum Co., Ltd. (now Mitsubishi Aluminum Co., Ltd.) was established.

In 1962, Mitsubishi Aluminum Co., Ltd. began as an aluminum rolling manufacturer through technology introduced by the U.S. company Reynolds. About half a century after inventing new metal and aluminum production methods, the predecessor of our company, Mitsubishi Mining Co., Ltd., started aluminum smelting in Taiwan. After a 17‑year postwar withdrawal, it resumed operations, and since then has contributed to industrial and economic development.

Mitsubishi Reynolds Aluminum Co., Ltd. (now Mitsubishi Aluminum Co., Ltd.) was established.

In 1963 (Showa 38), the Onahama Refinery was launched as a joint venture mainly by Mitsubishi Metal Mining Co., Ltd. (our predecessor), Shiwha Mining Co., Ltd., Furukawa Electric Co., Ltd., Furukawa Mining Co., Ltd., and six Mitsubishi companies, as a large coastal refinery.

In 1963, Kominami Smelting Co., Ltd. was launched as a large coastal joint smelter, primarily by Mitsubishi Metal Mining Co., Ltd. (the predecessor of our company) together with Sowa Mining Co., Ltd., Furukawa Electric Industrial Co., Ltd., Furukawa Mining Co., Ltd., and six Mitsubishi affiliates including Mitsubishi Electric Corp. The plant was built in Kominami, a coastal area capable of importing large quantities of refined copper ore from overseas mines and close to Japan’s largest domestic demand region, to consolidate advanced technology. Since then it has supported the development of Japan’s industrial economy through the stable supply of high‑quality copper.

In 1963, the Higashiyama plant in Yamamoto began cement production (later becoming the first and second Glory Halls).

In 1963, after acquiring the Saikura Mine of Kyori Mining Co., Ltd. located in Utsunomiya Village, Kurihara District, Miyagi Prefecture, Saikura Metal Mining Co., Ltd. (now 80 years old) grew into one of Japan’s top lead‑zinc mines through large‑scale development using cutting‑edge mining technology. Postwar, a difficult operating environment due to the yen’s appreciation led to its closure in 1987. Since then, it has contributed to building a circular society by focusing on lead recovery from automotive waste batteries.

In 1967 (Showa 42), the Yokkaichi Plant was established to produce high-purity multicrystalline silicon, the only domestic manufacturer specializing in high-purity silicon for electronics. It became our Yokkaichi Plant in 2007, celebrating its 50th anniversary next year.

In 1967, the Yokkaichi plant began producing high‑purity multicrystalline silicon. As the country’s sole dedicated manufacturer of high‑purity multicrystalline silicon, the company started in 1967. In 2007 it became our Yokkaichi plant, and the following year marked its 50th anniversary. As a key material manufacturer that has achieved remarkable growth in the semiconductor industry, it boasts world‑class quality and high production efficiency through relentless research and development.

A full view of the factory in 1970.

1971 (Showa 46): Mitsubishi Atomic Fuel Co., Ltd., aimed at producing nuclear fuel, was established.

Mitsubishi Atomic Fuel Co., Ltd., aimed at producing nuclear fuel, was established.

In 1972 (Showa 47), to expand the superhard tool business, a new factory was built in Kobe Town, Gifu Prefecture, starting production in April of the following year, to ensure stable supply and improve technical services for customers in the Tokai and Kansai regions.

1972 (Showa 47): The Fuji Oyama Factory (now Universal Can Co., Ltd. Fuji Mountain Factory) was established, entering the beverage aluminum can business.

In 1972, construction of a new plant began in Kobe Town, Anpaku District, Gifu Prefecture, and production started in April of the following year. The plant adopted Toyota Production System (Kanban) from Toyota Motor Corporation (now Toyota Motor Corp.) aiming for world domination, and has evolved into a mother‑tool plant that supports customers’ manufacturing.

Fuji Koyama Factory (now Universal Can Co., Ltd. Fuji Mountain Factory) was established. Entered the beverage aluminum can business.

1973 (Showa 48): Mitsubishi Mining Co., Ltd., Mitsubishi Cement Co., Ltd., and Toyokuni Cement Co., Ltd. merged to form Mitsubishi Mining Cement Co., Ltd. Mitsubishi Metal Mining Co., Ltd. changed its name to Mitsubishi Metal Co., Ltd.

The office building and factory building completed in 1973.

Mitsubishi Mining Co., Ltd., Mitsubishi Cement Co., Ltd., and Toyokuni Cement Co., Ltd. merged to form Mitsubishi Mining Cement Co., Ltd. Mitsubishi Metal Mining Co., Ltd. changed its corporate name to Mitsubishi Metal Co., Ltd.

1976 (Showa 51): Production and sale of ceramic electronic components began.

In 1976, the shaping process of Ring Valista (mother factory for electronic device components) and the ceramics factory in Yokose Town, Saitama Prefecture.

Started manufacturing and selling ceramic electronic components.

In 1978 (Showa 53), the Osarizawa Mine was closed due to low copper prices and ore depletion.

The Osezawa Mine (Akita Prefecture, Kakunodate City) is said to have discovered copper ore. It prospered as a gold mine from the Heian to Edo periods, and after the Meiji Restoration, it was developed by a Mitsubishi joint venture into one of Japan’s leading copper mines. In 1978, due to falling copper prices and ore depletion, the mine closed. Today it has been developed into a historical site with tourist tunnels such as Ishikizawa Tunnel, attracting many visitors nationwide.

Akita Smelting Plant, which was forced to cease production in 1996 (Heisei 8) due to rising electricity costs and sluggish metal prices encountered since the 1980s.

In the 1980s, during a period of light and short‑term operations, the company actively expanded business in electronic materials and precious metal processing. In 1989 it moved its production base to Techno Park in Mita City, Hyogo Prefecture, marking a new start.

1988 (Showa 63): Mitsubishi Cement Co., USA was established, entering overseas cement operations.

Mitsubishi Cement USA Inc. was established. Entered overseas cement business.

In 1989, the Sakai factory relocated to Sakai City, Osaka Prefecture, and started anew as a copper processing plant.

In 1989, the production base was moved to Techno Park in Mita City, Hyogo Prefecture, starting anew.

In 1990, at the Osaka Smelter affiliated with the Ministry of Home Affairs’ Office of the Imperial Household, the first industrialized electric copper smelting operation in Japan was established, producing gold, silver, copper, and other metals.

Mitsubishi Metal Co., Ltd. and Mitsubishi Mining Cement Co., Ltd. merged to form Mitsubishi Materials Co., Ltd.

1990 (Heisei 2): Mitsubishi Metal Co., Ltd. and Mitsubishi Mining Cement Co., Ltd. merged to form Mitsubishi Materials Co., Ltd.

1991 (Heisei 3): Merged with Tohoku Development Co., Ltd.

Merged with Tohoku Development Co., Ltd.

After entering the cement industry post-war, the Kyushu factory changed its name in 1994 and grew into a top cement plant.

After World War II, Mitsubishi Cement Co., Ltd. (a subsidiary of Mitsubishi Mining Co., Ltd.) entered the cement business. Through partnership and merger, the Kyushu plant (renamed in 1994) has become Japan’s leading cement factory.

1996 (Heisei 8): Indonesia Copper Smelting Co., Ltd. was established, entering copper smelting operations in Indonesia.

Indonesia Copper Smelting Co., Ltd. was established. Entered copper smelting business in Indonesia.

1998 (Heisei 10): Mitsubishi-Ube Cement Co., Ltd. was established jointly with Ube Kogyo Co., Ltd.

Co-established Ube Mitsubishi Cement Co., Ltd. with Ube Kogyo Co., Ltd.

1999 (Heisei 11): Entered the home appliance recycling business.

Entered the home appliance recycling business.

2000 (Heisei 12): Acquired Kobelco Tool Co., Ltd. (now Akashi Seisakusho). Strengthened the tooling business.

Acquired Kobe Kobelco Tool Co., Ltd. (now Akashi Seisakusho). Strengthened the tool business.

2001 (Heisei 13): Began manufacturing aluminum bottle cans at the Okayama plant (now Universal Can Co., Ltd. Okayama Plant).

Started manufacturing aluminum bottle cans at the Okayama Factory (now Universal Can Co., Ltd. Okayama Factory).

2002 (Heisei 14): Established Mitsubishi Sumitomo Silicon Co., Ltd. (now SUMCO), a joint venture with Sumitomo Metal Industries, Ltd. (now Nippon Steel, Ltd.) for silicon wafer business.

Established Mitsubishi Sumitomo Silicon Co., Ltd. (now SUMCO) as a joint venture with Sumitomo Metal Industries Co., Ltd. (now Nippon Steel Co., Ltd.) for silicon wafer business.

Until it was transferred outside the group in 2018, Daiwa Real Estate Co., Ltd. (renamed Mitsubishi Materials Real Estate Co., Ltd. in 2004) was established as a building leasing management company.

2004 (Heisei 16): Established Kobelco Material Copper Pipe Co., Ltd., a joint venture with Kobe Steel, Ltd. for copper pipe business.

In April 1950 (Showa 25), Taiei Mining Co., Ltd. (the predecessor of our company, which separated from Mitsubishi Mining Co., Ltd. under the Excessive Economic Power Concentration Elimination Act) and later renamed Mitsubishi Metal Mining Co., Ltd. in 1952, was established to build the Taiei Building (later renamed Mitsubishi Metal Building). In June 1950, Taiei Real Estate Co., Ltd. (later renamed Mitsubishi Material Real Estate Co., Ltd. in 2004) was founded to own and manage the building.

Established Kobe Steel Co., Ltd. Copper Tube Joint Venture, Kobe Material Copper Tube Co., Ltd.

In 2005, it merged with the aluminum can division of Hokai Seikan Co., Ltd. and started anew as Universal Seikan Co., Ltd.

2005 (Heisei 17): Established Universal Can Co., Ltd., a joint venture with Hokkan Holdings, Ltd. (formerly Kitai Seikan Co., Ltd.) for beverage aluminum can business.

In 2005, we merged with the aluminum can division of Kitakai Sui Kan Co., Ltd. and started anew as Universal Can Co., Ltd. Drawing on the wisdom gained from overcoming many hardships, we continue to progress steadily.

Established Universal Can Co., Ltd. as a joint venture with Hokkan Holdings Co., Ltd. (now Hokkan Holdings) for beverage aluminum can business.

In 2007, the Yokkaichi plant, which manufactures high-purity polycrystalline silicon, celebrated its 50th anniversary.

2007 (Heisei 19): Absorbed Mitsubishi Materials Polysilicon Co., Ltd. and established the Yokkaichi plant. Absorbed Mitsubishi Materials Kobe Tools Co., Ltd. and established Akashi Seisakusho.

In 2007, the company became the Yokkaichi plant, and next year marked the 50th anniversary of its founding.

Absorbed Mitsubishi Materials Polysilicon Co., Ltd. and established the Yokkaichi plant. Absorbed Mitsubishi Materials Kobe Tools Co., Ltd. and established the Akashi factory.

2008 (Heisei 20): Made Mitsubishi Shin Copper Co., Ltd. a consolidated subsidiary.

In 2008 (Heisei 20), we integrated management to realize the synergy of the Material Group, advancing robustly on the basis of the rich technology and human resources accumulated by the former two companies.

Made Mitsubishi Shindo Co., Ltd. a consolidated subsidiary.

In June 2009, the Aomori plant, equipped with the latest cement manufacturing technology in Japan, began operations.

In June 2009, the Aomori plant commenced operations, starting with the mission to produce and ship large quantities of high‑quality cement while supporting industrial promotion and infrastructure development in the Tohoku region.

In October 2009, the Sakai plant relocated to the Techno Park in Sanda City, Hyogo Prefecture, and started anew.

In October 2009, the Mita plant began operations. Like the Sakai plant introduced in the third edition, it is located at the Osaka Refinery affiliated with the Ministry of the Interior's Bureau of Materials, established in 1891 (Meiji 24). The site was transferred to Mitsubishi Joint Stock Company (the predecessor of our company) in 1896 and has produced gold, silver, copper, and other metals that supported Japan's modernization for a century. In 1990, it moved to Sakai City, Osaka Prefecture, and started anew as a copper processing plant.

2010 (Heisei 22): Made Mitsubishi Denken Kogyo Co., Ltd. a consolidated subsidiary.

Made Mitsubishi Electric Wire Industry Co., Ltd. a consolidated subsidiary.

In December 2011, the Akashi Works celebrated its 100th anniversary of producing high-speed steel (HSS) drills, the first in Japan. Its roots are in the drill factory of Kobe Steel, Ltd.

In December 2011, Akashi Manufacturing Co., Ltd., which celebrated the 100th anniversary of the first high‑speed steel (Hi‑S) drill production in Japan, traces its roots to the drill factory of Kobe Steel Co., Ltd. In 1911 (Meiji 44), it boldly challenged the world‑leading Hi‑S drill. Through successive technological innovations, it has contributed to Japan's industrial development as a mother tool. Today, it continues to stride strongly toward a greater future, built on rich technology and human resources grounded in history.

2012 (Heisei 24): MCC Development Co., Ltd. fully acquired Robertson Ready Mix Co., Ltd.

MCC Development Co. fully acquired Robertson Ready Mix Co.

Universal Seikan Co., Ltd. celebrated its 40th anniversary in October 2012.

In October 2012, Universal Can Co., Ltd. celebrated its 40th anniversary. Its roots lie in the Fuji Koyama plant of Mitsubishi Metal Mining Co., Ltd. (the predecessor of our company). At that time, it challenged the rapidly growing "aluminum beverage cans" in the United States. Continuing successive technological innovations and steady recycling activities, it has driven Japan's beverage container revolution. In 2005, it merged with the aluminum can division of Kitakai Sui Kan Co., Ltd. and started anew as Universal Can Co., Ltd., continuing to progress steadily by drawing on the wisdom gained from overcoming many hardships.

Nippon Shinkinzoku Co., Ltd., which manufactures and sells tungsten powder for superhard tools, celebrated its 50th anniversary in 2013.

In 2013, Nihon Shin Kinzoku Co., Ltd. celebrated its 50th anniversary, manufacturing and selling tungsten powder and other hard‑tool raw materials. Its roots trace back to 1909 (Meiji 42) when Takashi Awamura (founder of Awamura Mining Co., Ltd.) discovered Japan's first tungsten ore. Amid the volatile demand and price fluctuations of the rare‑metal industry, Nihon Shin Kinzoku Co., Ltd. was founded in 1963 (Showa 38) through joint investment with Mitsubishi Metal Mining Co., Ltd. (the predecessor of our company). With keen insight into rare metals and relentless technical research by its employees, it has advanced as a pioneer of high‑tech materials for many years.

Daiyamet Co., Ltd., which overcame drastic changes in manufacturing items during wartime and post-war, and achieved regeneration and development with sintered parts, celebrated its 70th anniversary in 2014.

2015 (Heisei 27): Made Hitachi Tool Co., Ltd. a consolidated subsidiary and renamed Mitsubishi Hitachi Tool Co., Ltd. (now MOLDINO Co., Ltd.).

Made Hitachi Tool Co., Ltd. a consolidated subsidiary and renamed Mitsubishi Hitachi Tool Co., Ltd. (now MOLDINO Co., Ltd.).

2017 (Heisei 29): Acquired the Special Products division from Lubata Co., Ltd., which manufactures and sells copper products.

Acquired the Special Products division that manufactures and sells copper products from Lubata Co.

In June 2017, it was established as a rare private research institution, the Mining Research Institute, and in June 2017, celebrated its 100th anniversary as the Central Research Institute. It was started with the insight of Iwasaki Koyata, President of Mitsubishi Goshi Kaisha (the 4th head of the Mitsubishi conglomerate).

Mitsubishi Materials Real Estate Co., Ltd. (formerly Daiwa Real Estate Co., Ltd.), transferred outside the group in 2018, was established as a building leasing management company and has been developing a solid real estate business.

2019 (Reiwa 1): Transitioned to a company with a nomination committee and similar governance structure.

Transitioned to a company with a Nomination Committee and the like.

2020 (Reiwa 2): Absorbed Mitsubishi Shin Copper Co., Ltd. and established Wakamatsu Seisakusho and Sanpo Seisakusho. Fully acquired Mitsubishi Hitachi Tool Co., Ltd. and renamed it MOLDINO Co., Ltd.

Absorbed Mitsubishi Shindo Co., Ltd. and established Wakamatsu Factory and Sanbō Factory. Fully acquired Mitsubishi Hitachi Tool Co., Ltd. and renamed it MOLDINO Co., Ltd.

2021 (Reiwa 3): Designated Manto Verde Co., Ltd. as an associate under the equity method.

Made Mante Verde Co. a joint venture under the equity method.

2022 (Reiwa 4): Transferred all shares of Universal Can Co., Ltd. and, through a split‑and‑merge, transferred Mitsubishi Aluminum Co., Ltd.'s aluminum rolling and extrusion business to Showa Aluminum Can Co., Ltd. (now Artemira Co., Ltd.) and transferred the cement business and related operations to UBE Mitsubishi Cement Co., Ltd.

Transferred all shares of Universal Cans Co., Ltd. that it owned. Through absorption and split, Mitsubishi Aluminum Co., Ltd.'s aluminum rolling and extrusion business was transferred to Showa Aluminum Cans Co., Ltd. (now Artemira Co., Ltd.). Through absorption and split, the cement business and related businesses were transferred to UBE Mitsubishi Cement Co., Ltd.

2023 (Reiwa 5): Absorbed Material Finance Co., Ltd., fully acquired Konomihama Seisen Co., Ltd., and, through a split‑and‑merge, transferred the multicrystalline silicon business to High‑Purity Silicon Co., Ltd., then sold all shares of that company.

Absorbed and merged with Stock Material Finance. Fully acquired Komiyama Refining Co., Ltd. Through absorption and split, the multicrystalline silicon business was transferred to High Purity Silicon Co., Ltd., and all shares of that company were transferred.

2024 (Reiwa 6): Made Anbi Thermal Co., Ltd. a consolidated subsidiary. Expanded and reorganized MM Netherlands' functions, established Mitsubishi Materials Europe Co., Ltd., and through it acquired all shares of H.C. Stalk Holdings Co., Ltd.

Made Anbi Geothermal Co., Ltd. a consolidated subsidiary. Expanded and reorganized the functions of MM Netherlands Co., and established Mitsubishi Materials Europe Co. Through Mitsubishi Materials Europe Co., acquired all shares of H.C. Starke Holding Co.