Mitsui family
Mitsui Takatoshi, son of a sake brewer, founded Echigoya, a dry-goods store, in 1673 in both Edo (Tokyo) and Kyoto, introducing a then-radical cash-only, fixed-price retail model. He expanded into moneylending and currency exchange, and in 1691 the Mitsuis were chartered as merchants to the Tokugawa shogunate.
How the fortune was built
Echigoya evolved into the Mitsukoshi department-store chain, while the wider Mitsui house grew into one of Japan's largest zaibatsu, spanning banking, trading, mining, and shipbuilding. The US occupation forcibly dissolved the zaibatsu in 1946; its businesses reorganized from 1950 into a looser 'keiretsu' without a central family holding company. Mitsui & Co. reformed under that name in 1959 as one of Japan's general trading houses, and Mitsui Fudosan grew into a major global real-estate developer.
Where the family invests today
Unlike the other families profiled here, the founding Mitsui family no longer controls or operates a distinct investment vehicle — both Mitsui & Co. and Mitsui Fudosan are widely held public companies run by professional management, with institutional investors as their largest shareholders. What can be described instead is the companies' own strategy: Mitsui & Co. is directing roughly ¥1 trillion toward energy transition and a 'wellness ecosystem' of healthcare and protein businesses, while Mitsui Fudosan expands into overseas logistics, life sciences, and hospitality.
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