The article examines the issue of the foreign law as an applicable law of shareholders’ agreement at companies established under the laws of Ukraine. The emergence of shareholders’ agreement in the legal system of Ukraine, as well as the changes that have taken place during the last decades regarding the possibility of applying foreign law to contractual corporate relations, have been studied. Because of authority of English common law among Ukrainian legal practitioners, there is an attitude among them to choose it as the foreign law that will be applied to shareholders’ agreement. At the same time, there are significant differences in the basic principles of common law and continental legal family, which includes the legal system of Ukraine. On the other hand, the law of Ukraine will remain the applicable law for the rest of corporate relations in the relevant companies insofar as it is its lex societatis (i.e. everything with except of obligations of the parties to the shareholders’ agreement). Taking into account all the above, a conclusion was made to introduce a document equidistant from both legal systems and able to ensure a high quality regulation of general issues of contract law, namely the UNIDROIT Principles of International Commercial Contracts, among instruments providing regulation of relations under shareholders’ agreement. It is proposed to use one of the standard UNIDROIT clauses in order to determine the hierarchy between the provisions of foreign national law and the UNIDROIT Principles, as well as their correlation with the provisions of the shareholders’ agreement itself. It was also concluded that the UNIDROIT Principles might be applied to shareholders’ agreement even in the absence of a foreign element to establish a regulation of a contractual relations at the level of the best international standards.