Cal. Ins. Code § 1100
In this state, all investments and deposits of the assets of an insurer, all purchases on behalf of an insurer, and all sales made of the property and effects of an insurer shall be made in its own name, or in that of a corporation authorized to act as a trustee under the laws of this state, or in the name of a nominee of such a corporation in accordance with any law of this state permitting such a trustee to make use of nominees, or in the name of a qualified custodian, qualified subcustodian, or qualified depository (as defined in Section 1104.9) or in the name of a nominee of a qualified custodian, qualified subcustodian, or qualified depository, provided that the nominee is not a corporation and, as to any nominee which is a partnership, the partnership shall consist solely of the employees, officers, or directors of the qualified custodian, qualified subcustodian, or qualified depository or a corporation which is a member of the same holding company system as the nominee, or any combination thereof, or in the name of a nominee approved by the commissioner.
Ca. Ins. Code § 1100