Cal. Ins. Code § 15031

(a) A licensee shall not conduct a business under a fictitious or other business name unless and until he or she has obtained the written authorization of the commissioner to do so.
(b) The commissioner shall not authorize the use of a fictitious or other business name that is so similar to that of a public officer or agency or that is used by another licensee that the public may be confused or misled thereby.
(c) The authorization shall require, as a condition precedent to the use of a fictitious name, that the licensee comply with Section 1724.5.
(d) A licensee desiring to conduct his or her business under more than one fictitious name shall obtain the authorization of the commissioner in a manner prescribed in this section for the use of additional fictitious names.
(e) The licensee shall pay a fee of twenty-five dollars ($25) for each authorization to use an additional fictitious name and for each change in the use of a fictitious business name. If the original license is issued in a nonfictitious name and authorization is requested to have the license reissued in a fictitious business name, the licensee shall pay a fee of twenty-five dollars ($25) for that authorization.