A keiretsu (系列, series or subsidiary) is a group of companies with interlocking business relationships and shareholdings. Keiretsu were established following the Allied occupation of Japan after WWII and the dissolution of the family-owned conglomerates. The keiretsu run their subsidary businesses through a system of cross-shareholding, where each company owned shares in all other group members. Within this keiretsu, the major shareholders are typically a bank, a brokerage, and an insurance company.

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