Rump is the name given to minority group of investors who refuse to tender their shares in a corporate action, such as a rights issue or merger or acquisition.


Rump shareholders can be forced to sell their shares without their consent by the underwriters, through a squeeze-out, depending on the percentage of shares owned by the majority — and as long as it is on the same terms as the offer made to the other shareholders. For example, in the United Kingdom, shareholders owning 90% of the company can consent to squeeze out the other minority shareholders.

The rump can stall or halt takeovers if they own enough shares. However, if they are not in a position to block a merger, their share of the company’s cash flow may be enough to discourage the acquiring company from completing the merger or acquisition in the first place.