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Can a shareholder be liable in case of bankruptcy of one of the companies he invested in?
Not normally, for a limited liability company anyway. In extreme circumstances a court may "lift the veil" of incorporation and treat shareholders as if they were partners. If you are an office bearer or a director that is found to have breached duties/responsibiities then that is another matter. Dim views can be taken of shonky arrangents for companies formed for activites not of a bona fide business nature too.