The article presents the issue of maintaining the insider list referred to in Article 18 MAR in the capital group. The main research problem analysed by the authors is whether the provisions MAR constitute the legal basis for including the employees of the issuer's subsidiaries in the insider list maintained by the issuer (the parent company). In the authors' opinion, employees of subsidiaries having preferential access to inside information produced in a subsidiary should be considered as persons to be included in the insider list maintained by the issuer. The proposed interpretation is consistent with all views treating the capital group as a single economic unit, pursuing an interest that is essentially convergent for all participants of the group.