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Related to split up: split off
An action in which a publicly-traded company splits into two different publicly-traded companies. Stock in the company is exchanged for stock in both of the new companies according to some predetermined formula. A split-up may happen at government instigation, for example, to end a monopoly. A company may also voluntarily split up if it believes it will improve profitability.
The distribution of all of a firm's assets, generally in the form of stock distributions, such that the firm ceases to exist.