Mochibun kaisha (?) are a class of corporations under Japanese law. While mochibun kaisha have legal personality as corporations, their internal functions are similar to partnerships, as they are both owned and operated by a single group of members (, shain).
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There are three types of mochibun kaisha:
Mochibun kaisha are formed by preparing articles of incorporation and depositing the articles with a local Legal Affairs Bureau.
The Japanese civil code also provides for partnerships (, kumiai), a different type of business organization. Civil code partnerships lack legal personality and are mainly used for investment funds and professional firms.