Therefore, executives of insurance companies cannot serve as supervisors of insurance companies, and other companies are equally applicable.
If the executive of an insurance company can be the supervisor of another insurance agency, according to some economic laws I have learned, if the two insurance companies are not related, then the executive of this insurance company can be the supervisor of another company.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.