(9) “Control” means the power to exercise a controlling influence over the management or policies of a company, unless such power is solely the result of an official position with such company. Any person who owns beneficially, either directly or through one or more controlled companies, more than 25 per centum of the voting securities of a company shall be presumed to control such company. Any person who does not so own more than 25 per centum of the voting securities of any company shall be presumed not to control such company. A natural person shall be presumed not to be a controlled person within the meaning of this subchapter. Any such presumption may be rebutted by evidence, but except as hereinafter provided, shall continue until a determination to the contrary made by the Commission by order either on its own motion or on application by an interested person. If an application filed hereunder is not granted or denied by the Commission within sixty days after filing thereof, the determination sought by the application shall be deemed to have been temporarily granted pending final determination of the Commission thereon. The Commission, upon its own motion or upon application, may by order revoke or modify any order issued under this paragraph whenever it shall find that the determination embraced in such original order is no longer consistent with the facts.