A single-shareholder company is a capital company in which all the shares belong to one shareholder (article 4 paragraph 1 point 3 of the Polish Commercial Companies Code).

According to article 1 paragraph 2 of the Polish Commercial Companies Code commercial companies shall include: a registered partnership, a professional partnership, a limited partnership, a limited joint-stock partnership, a limited liability company and a joint-stock company.

At the request of all other shareholders the court may, for important reasons concerning a given shareholder, give judgment on the exclusion of that shareholder from the company, provided the shareholders requesting exclusion account for more that half of the initial capital. The company deed may vest the right of bringing the action referred to above also in less that all shareholders, provided they account for more that half of the initial capital. In such a case, all remanding shareholders shall be sued.