It is unlawful for the securities commissioner or any of his officers or employees to use for personal benefit any information which is filed with or obtained by the securities commissioner and which is not made public. No provision of this chapter authorizes the securities commissioner or any of his officers or employees to disclose any such information except among themselves or when necessary or appropriate in a proceeding or investigation under this chapter. Investigative records and complaints filed with the securities commissioner shall not be considered public information. Orders issued by the commissioner, including complaints of the commission, are to be considered public records.