The main bank was lender, shareholder and monitor in one — the financial glue of the keiretsu.
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Keiretsu & Conglomerates
Expert guides, analysis and tool comparisons on Keiretsu & Conglomerates from the kurums.com Startup desk — written for business decision-makers and updated as the market moves.
- 5 guides
- Updated Jul 22, 2026
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Zaibatsu vs Keiretsu: How Corporate Japan Was Rebuilt
The shift from family-controlled zaibatsu to relational keiretsu is the key to understanding corporate Japan.
Sumitomo: The Keiretsu Built on Copper and Creed
Sumitomo grew from a 17th-century copper mine into a materials-science keiretsu guided by a famous creed.
Mitsui: Inside Japan’s 350-Year-Old Business Empire
Mitsui traces to a 1673 kimono shop and today spans one of the world’s great trading houses.
The Mitsubishi Group: How Japan’s Biggest Keiretsu Works
Mitsubishi is the archetype of the Japanese keiretsu — a 40-firm federation bound by cross-shareholdings and the Friday Conference.