Iwasaki Yatarō launched a shipping firm that became the nucleus of the Mitsubishi zaibatsu, linking maritime transport, trade, and later heavy industry under centralized family control.
The enterprise formally adopted the name Mitsubishi Shokai, helping standardize branding and corporate identity as the group expanded beyond its initial shipping base.
Mitsubishi inaugurated a passenger liner route from Yokohama to Shanghai, marking early international expansion in shipping and reinforcing the group’s strategic role in overseas commerce.
Mitsui created a modern general trading company (Mitsui Bussan, later Mitsui & Co.), integrating exports/imports with financing—an institutional hallmark of zaibatsu expansion.
Yasuda Zenjirō helped found the Third National Bank, an early step in building the Yasuda financial empire that later centered on Yasuda Bank and major insurance interests.
Mitsui Bank began operations as Japan’s first private bank, strengthening the Mitsui group’s financial core and enabling coordinated investment across trading, mining, and manufacturing.
Yasuda Zenjirō founded Yasuda Bank, consolidating banking control that became central to the Yasuda zaibatsu’s expansion into finance and insurance.
Under Meiji-era leadership, Sumitomo adopted Western technologies to modernize the Besshi Copper Mine, increasing output and using mining profits to diversify into manufacturing and finance—key drivers of Sumitomo’s zaibatsu growth.
With Japan’s new Commercial Code, Mitsubishi restructured into a partnership company (Mitsubishi Goshi Kaisha), an organizational step associated with stronger internal coordination across the growing group.
Sumitomo Bank was established as a private enterprise, providing the Sumitomo group with a dedicated banking pillar to finance industrial expansion and overseas activities.
Mitsui chairman Dan Takuma was assassinated in Tokyo amid anti-zaibatsu ultranationalist violence, highlighting rising political hostility toward concentrated corporate power during the early Shōwa period.
Mitsubishi reorganized into a joint-stock company (Kabushiki Kaisha Mitsubishi Sha), reflecting interwar-era pressures for modern corporate governance while preserving zaibatsu-style group coordination.
Mitsubishi Sha was renamed Kabushiki Kaisha Mitsubishi Honsha, reflecting wartime-era organizational consolidation at the group’s apex.
SCAP issued the directive (SCAPIN-244) approving plans to dissolve major zaibatsu holding companies (including Mitsui Honsha, Sumitomo Honsha, Yasuda Hozensha, and Mitsubishi Honsha), initiating formal occupation policy to dismantle concentrated family control.
SCAP directed Japan to create the Holding Company Liquidation Commission (HCLC), providing the institutional mechanism to take over and dispose of zaibatsu holding-company securities and related assets.
SCAPIN-1363 required transfer of designated zaibatsu family properties to the HCLC, expanding dismantlement beyond corporate entities to include controlling-family holdings central to zaibatsu power.
Formation and Expansion of the Japanese Zaibatsu (1870–1945)
