Iowa Code § 515.140
It shall be unlawful for two or more insurance companies doing business in this state, or for the officers, agents, or employees of such companies, to make or enter into any combination or agreement relating to the rates to be charged for insurance, the amount of commissions to be allowed agents for procuring the same, or the manner of transacting the insurance business within this state, but any number of insurance companies may appoint the same person or persons, who shall be residents of the state of Iowa, as their common agent or agents for the purpose of filing, in the manner prescribed by the insurance commissioner of Iowa, the forms of policies and of all permits and riders used generally throughout the state, as required by the laws of this state to be examined and approved by the said commissioner.
Iowa Code § 515.140
Referred to in §515.141, 515.145, 515A.19