Mochibun kaisha (持分会社) are a class of corporations under Japanese law.
[1] 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 (社員, shain).
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 (組合, kumiai), a different type of business organization.
Civil code partnerships lack legal personality and are mainly used for investment funds and professional firms.