30 ILCS 750/9-8
Any documentary materials or data made or received by any member, agent or employee of the Department, to the extent that such material or data consists of trade secrets, commercial, or financial information regarding the operation of any enterprise conducted by an applicant for, or a recipient of, any form of assistance which the Department is empowered to render under this Article, or regarding the competitive position of such enterprise in a particular field of endeavor, shall be deemed to be confidential and shall not be deemed public records; provided, however, that if the Department purchases a qualified security from such enterprise, the commercial and financial information, excluding trade secrets, shall be deemed to become a public record of the Department after the expiration of three years from the later of the date of purchase of such qualified security or the date of receipt of such information by the Department to the extent that such information is available to the holder of such qualified security.
30 ILCS 750/9-8