California Code, Insurance Code - INS § 1242

(a)(1) Except as otherwise specified in Section 1241, a domestic insurer shall not acquire directly or indirectly through an investment subsidiary, an investment under Section 1241 if, as a result of and after giving effect to the investment, the insurer would hold more than 3 percent of its admitted assets in investments of all kinds issued, assumed, accepted, insured, or guaranteed by a single person, or 5 percent of its admitted assets in investments in the voting securities of a depository institution or any company that controls the institution.

(2) The 3 percent limitation in paragraph (1) shall not apply to the aggregate amounts insured by a single financial guaranty insurer with the highest generic rating issued by a nationally recognized statistical rating organization.