760 ILCS 100/11.2: Service.

Service by the Comptroller of any notice requiring a person to file a statement or report shall be made:

(1) personally by delivery of a duly executed copy thereof to the person to be served or, if that person is not a natural person, in the manner provided in the Civil Practice Law when a complaint is filed; or

(2) by mailing by certified mail a duly executed copy thereof to the person to be served at his or her last known abode or principal place of business within this State.