Cal. INS § 1185

(a) Every domestic incorporated insurer shall file a report with the commissioner disclosing material acquisitions and dispositions of assets or material nonrenewals, cancellations, or revisions of ceded reinsurance agreements unless the acquisitions and dispositions of assets or material nonrenewals, cancellations, or revisions of ceded reinsurance agreements have been submitted to the commissioner for review, approval, or information purposes pursuant to other provisions of this code, laws, regulations, or other requirements.

(b) The report shall be filed within 15 days after the end of the calendar month in which any of the foregoing transactions occur.

(c) One complete copy of the report, including any exhibits or other attachments filed as part thereof, shall be filed with the department and the National Association of Insurance Commissioners.

(d) All reports obtained by, or disclosed to the commissioner pursuant to this article, shall be given confidential treatment and shall not be subject to subpoena and shall not be made public by the commissioner, the National Association of Insurance Commissioners, or any other person, except to insurance departments of other states, without the prior written consent of the insurer to which it pertains unless the commissioner, after giving the insurer who would be affected thereby, notice and an opportunity to be heard, determines that the interest of policyholders, shareholders, or the public will be served by the publication thereof, in which event the commissioner may publish all or any part thereof in such manner as he or she may deem appropriate.