Cal. INS § 937.1

(a) (1) On or before March 1, 2026, and on or before March 1 of every year thereafter, an admitted insurer in a group with written premiums in the prior year from fire, allied lines, private flood, homeowners, farmowners, and commercial nonliability lines totaling fifty million dollars ($50,000,000) or more shall submit a report to the commissioner that shall only include data and information necessary to understand its reinsurance program placement data and use of probabilistic catastrophic models for the previous year for policies.

(2) Reports filed on or before March 1, 2026, shall include data from the latest available reinsurance treaty year. Subsequent reports shall likewise include data from the latest reinsurance treaty year available when the report is due.

(3) The commissioner may specify the manner of submission, format, and content of the report required pursuant to paragraph (1).

(b) An insurance holding company system, as defined in subdivision (h) of Section 1215, may submit a consolidated report of the information required by this section for all insurers comprising the holding company system.

(c) Upon submission of a report pursuant to this section, the insurer shall promptly respond to inquiries from the commissioner or their representative regarding the information submitted in the report.