Cal. Ins. Code § 10494.7
With respect to the supplemental plan described in Section 10494.6, the commissioner may, in addition to the regulations permitted by Section 10498.6, promulgate other reasonable regulations covering all matters set forth in Section 10494.6 and this section. The commissioner shall require each employer making available such supplemental plan to post with him security in the form of a bond of an admitted surety insurer conditioned on the payment by the employer of his obligations under the entire plan or of deposits with the commissioner of securities approved by him to secure the payment of such obligations. Such security shall be equal to the greater of (a) twenty-five thousand dollars ($25,000), (b) the estimated contributions of the employees under the entire plan for the ensuing year, (c) the contributions paid by the employees under the entire plan during the preceding year, or (d) one-half of all of the amounts of benefit either paid or incurred by the employer under the entire plan during the preceding year.
If, on examination or investigation of any plan which includes benefits for dependents, the commissioner finds that the aggregate of the trust funds separately held for the supplemental plan and the security in the form hereinabove described may not, in his judgment, be adequate to guarantee the payment of outstanding and incurred liabilities of the entire plan, he may require the employer to post such additional security as will, in his judgment, be adequate to guarantee the payment of all outstanding and incurred liabilities of the entire plan, and, if the employer fails to post such additional security, he may revoke the employer's certificate of exemption.
Ca. Ins. Code § 10494.7