
Mitsui Group is one of the largest keiretsu in Japan and one of the largest corporate groups in the world.

Denka Company Limited ; formerly Denki Kagaku Kogyo Kabushiki Kaisha (電気化学工業株式会社) is a Japanese chemical company, established in 1915 and headquartered in Tokyo, manufacturing organic and inorganic chemicals, cement, special cement additives, electronic component transfer materials and food packaging materials. The company is listed on the Tokyo Stock Exchange and is a constituent of the Nikkei 225 stock index.

Greater Anglia is a train operating company in Great Britain owned as a joint venture by Abellio, the international arm of the state-owned Dutch national rail operator Nederlandse Spoorwegen, and the Japanese trading company Mitsui & Co. It operates the East Anglia franchise, providing the commuter and intercity services from its Central London terminus at London Liverpool Street to Essex, Suffolk, Norfolk and parts of Hertfordshire and Cambridgeshire as well as many regional services throughout the East of England.

GS Yuasa Corporation is a Kyoto-based Japanese company specializing in the development and production of lead acid and lithium-ion batteries, used in automobiles, motorcycles and other areas including aerospace and defense applications.

Ibiden Co., Ltd. is a Japanese electronics company headquartered in Ogaki, Gifu prefecture that manufactures electronics-related products, such as printed circuit boards and IC packaging. The company also makes ceramics products, including particulate filters for diesel engines, for which it has a 50% market share in Europe.

Ikeda Shigeaki , also known as Seihin Ikeda, was a politician, cabinet minister and businessman in the Empire of Japan, prominent in the early decades of the 20th century. He served as director of Mitsui Bank from 1909-1933, was appointed governor of the Bank of Japan in 1937, and served as Minister of Finance under Prime Minister Fumimaro Konoe from 1937 to 1939. In 1941, he was made a member of the Imperial Privy Council; following Japan's defeat in World War II, Ikeda was banned from public political service.

Isetan Mitsukoshi Holdings Ltd. is a pure holding company with the Mitsukoshi and Isetan department stores as its wholly owned subsidiaries.
Japan Steel Works, Ltd. is a steel manufacturer founded in Muroran, Hokkaidō, Japan in 1907.

Kashima Antlers are a Japanese professional football club based in Kashima, Ibaraki, part of the Greater Tokyo Area. The club plays in the J1 League, which is the top tier of football in the country.

The Kestrel Coal Mine is an underground coal mine located in the Bowen Basin at Crinum, 51 km northeast of Emerald in Central Queensland, Australia. The mine has coal reserves amounting to 158 million tonnes of coking coal, one of the largest coal reserves in Asia and the world. The mine has an annual production capacity of 4 million tonnes of coal. Both hard/semi hard coking coal and thermal coal is mined.

Ministry of Sound Group is a multimedia entertainment business based in London with a nightclub, shared workspace and private members club, worldwide events operation, music publishing business and fitness studio.
Mitsui Chemicals is a Japanese chemicals company listed on the Nikkei with business interests in Japan, Europe, China, Southeast Asia and the USA. It is a part of the Mitsui conglomerate. The company mainly deals in performance materials, petro and basic chemicals and functional polymeric materials.

Mitsui Engineering & Shipbuilding is a Japanese company. It is listed on the Nikkei 225.

The Mitsui family is one of the most powerful families of merchants and industrialists in Japan.

The Mitsui Fudosan Co., Ltd. is a major real estate developer in Japan. Mitsui Fudosan is one of the core companies of Mitsui Group.

Mitsui Knowledge Industry Co., Ltd. is a Japanese company headquartered in Tokyo, Japan, that offers IT services.

The Mitsui Memorial Museum is an art museum in Tokyo's Nihonbashi district. It is located within the Mitsui Main Building, an Important Cultural Property as designated by the Japanese government.

Mitsui O.S.K. Lines is a Japanese transport company headquartered in Toranomon, Minato, Tokyo, Japan. It is one of the largest shipping companies in the world.

Mitsui Sumitomo Insurance Group Holdings, Inc. is a Japanese insurance holding company headquartered in Tokyo, Japan.

Mitsukoshi, Ltd. is an international department store chain with headquarters in Tokyo, Japan. It is a subsidiary of Isetan Mitsukoshi Holdings, which also owns the Isetan department store chain.

NEC Corporation is a Japanese multinational information technology and electronics company, headquartered in Minato, Tokyo. The company was known as the Nippon Electric Company, Limited, before rebranding in 1983 as NEC. It provides IT and network solutions, including cloud computing, AI, IoT platform, and 5G network products, to business enterprises, communications services providers and to government agencies, and has also been the biggest PC vendor in Japan since the 1980s, when it launched the PC-8000 series.

Nippon Flour Mills Co., Ltd. d/b/a NIPPN is a Japanese company which derives most of its revenue from milling flour and produces flour related products such as noodles. It was established in 1896 and is a Mitsui-related company.

Nippon Paper Industries Co., Ltd. is a Japanese paper manufacturing company. The company's stock is listed on the Tokyo and Nagoya Stock Exchange and on the Osaka Securities Exchange. The stock is also constituent of the Nikkei 225 stock index.

Nippon Sheet Glass Co., Ltd. is a Japanese glass manufacturing company. In 2006 it purchased Pilkington of the United Kingdom. This makes NSG/Pilkington one of the four largest glass companies in the world alongside another Japanese company Asahi Glass, Saint-Gobain, and Guardian Industries.

Oji Holdings Corporation is a Japanese manufacturer of paper products. In 2012 the company was the third largest company in the global forest, paper and packaging industry. The company's stock is listed on the Tokyo Stock Exchange and the stock is constituent of the Nikkei 225 stock index.

The Ōsumi class LST (おおすみ型輸送艦), is a Japanese amphibious transport dock. The class is also known as the Oosumi class. While the JMSDF describes the Ōsumi class as tank landing ships, they lack the bow doors and beaching capability traditionally associated with LSTs. Functionally, their well deck makes the Ōsumi class more like a dock landing ship (LSD).

The Sakura Bank, Limited was a Japanese bank based in Tokyo and Kobe. It was formed in April 1990 as the Mitsui Taiyo Kobe Bank (MTKB) by the merger of Mitsui Bank and Taiyo Kobe Bank. The Sakura Bank name was adopted in April 1992.

Sapporo Breweries Ltd. is a Japanese beer brewing company founded in 1876. Sapporo is the oldest brand of beer in Japan. It was first brewed in Sapporo, Japan, in 1876 by brewer Seibei Nakagawa. The world headquarters of Sapporo Breweries is in Ebisu, Shibuya, Tokyo. The company purchased the Canadian company Sleeman Breweries in 2006.

Showa Aircraft Industry Co., Ltd. is a Japanese company. Its headquarters are at Akishima-shi, Tokyo Prefecture, a region of Tokyo Metropolis. It was established in 1937 as a manufacturer of military aircraft in Akishima-shi. In World War II it was one of two companies manufacturing the Showa/Nakajima L2D, a license-built Douglas DC-3 variant. It also manufactured other military aircraft.

Sony Corporation is a Japanese multinational conglomerate corporation headquartered in Kōnan, Minato, Tokyo. The company operates as one of the world's largest manufacturers of consumer and professional electronic products, the largest video game console company, the second largest video game publisher, the second largest record company, as well as one of the most comprehensive media companies, being the largest Japanese media conglomerate by size overtaking the privately held, family-owned Yomiuri Shimbun Holdings, the largest Japanese media conglomerate by revenue.

The Sumitomo Group is one of the largest Japanese keiretsu, or business groups, founded by Masatomo Sumitomo around 1615.

Sumitomo Life Insurance Company is a mutual life insurance company in Japan, founded in 1907 and headquartered in Osaka.
Sumitomo Mitsui Banking Corporation Group is a Japanese multinational banking and financial services institution headquartered in Yurakucho, Chiyoda, Tokyo, Japan. The group operates in retail, corporate, and investment banking segment worldwide. It provides financial products and services to a wide range of clients, including individuals, small and medium-sized enterprises, large corporations, financial institutions and public sector entities. Since 2011, it has been included into the Financial Stability Board's list of global systemically important banks.
Sumitomo Mitsui Banking Corporation Group is a Japanese multinational banking and financial services institution headquartered in Yurakucho, Chiyoda, Tokyo, Japan. The group operates in retail, corporate, and investment banking segment worldwide. It provides financial products and services to a wide range of clients, including individuals, small and medium-sized enterprises, large corporations, financial institutions and public sector entities. Since 2011, it has been included into the Financial Stability Board's list of global systemically important banks.

Sumitomo Rubber Industries, Ltd. is a global tire and rubber company based in Japan. It is part of the Sumitomo Group. The company makes a wide range of rubber based products, including automobile tires, golf balls and tennis balls. Sumitomo brands include Dunlop Tyres, Falken Tire and Ohtsu Tire.

Taiheiyo Cement Corporation is a Japanese cement company. It was formed in 1998 with the merger of Chichibu Onoda and Nihon Cement.

Toagosei Co., Ltd. is a Japanese chemical company, producing cyanoacrylate adhesives since 1963. Other chemical products of the company include high purity gases, soda and chlorine products and instant glue, which is sold in Japan as Aron Alpha and marketed in the United States as Krazy Glue.

Toray Arrows (東レ・アローズ) is a women's volleyball team based in Ōtsu, Shiga, Japan. It plays in V.League Division 1. The club was founded in 2000. The owner of the team is Toray Industries. The jersey number of the team is the order of the age.

Toray Arrows (東レ・アローズ) is a men's volleyball team based in Mishima city, Shizuoka, Japan. They play in V.Premier League. The owner of the team is Toray Industries.

Toray Industries, Inc. is a multinational corporation headquartered in Japan that specializes in industrial products centered on technologies in organic synthetic chemistry, polymer chemistry, and biochemistry.
Toshiba Corporation is a Japanese multinational conglomerate headquartered in Minato, Tokyo. Its diversified products and services include power, industrial and social infrastructure systems, elevators and escalators, electronic components, semiconductors, hard disk drives, printers, batteries, lighting, logistics, as well as IT solutions such as quantum cryptography. It had been one of the biggest manufacturers of personal computers, consumer electronics, home appliances, and medical equipment. As a semiconductor company and the inventor of flash memory, Toshiba had been one of top 10 in the chip industry until its flash memory unit was spun off as Toshiba Memory, later Kioxia, in the late 2010s.

Toyo Engineering Corporation is a Japanese engineering, procurement and construction company serving mainly the hydrocarbons and petrochemical sectors worldwide.

Ultra Music is a worldwide music entity, comprising Ultra Records, Ultra Music Publishing, and Empire Artist Management. Ultra Music was formed in New York City in 1995 by former Polygram and Virgin Records executive Patrick Moxey, who is the owner. As of December 23, 2012, Ultra entered a global alliance with Sony Music, giving its artists access to Sony's international marketing and promotional resources. Moxey also holds the title as president of Sony's Worldwide Electronic Music efforts.