Normally signatory rights are defined in the company’s constitutional documents, the memorandum and articles. Normally the directors sign but it is possible for shareholders to be given some signatory rights particularly for large value transactions, changes in the constitution of the company and in other very important company matters.
Anyone can also be appointed as a signatory to bank accounts – bank signatories do not have to be directors or shareholders. A power of attorney can also give a person who is not a director powers to sign for the company.