30 ILCS 561/10

Each holder of any beneficial interest in the land, including without limitation beneficial interests in a land trust, must be disclosed, including both individuals and other entities. If any beneficial interest is held by an entity, other than an entity whose shares are publicly traded, and not by an individual, then all the holders of any beneficial interest in that entity must be disclosed. This requirement continues at each level of holders of beneficial interests until all beneficial interests of all individuals in all entities, other than entities whose shares are publicly traded, have been disclosed.