Iowa Code § 493.1
Any corporation, heretofore or hereafter organized for pecuniary profit under the laws of this state, except state banks, trust companies, and insurance companies, may create one or more classes of stock without any nominal or par value, with such rights, preferences, privileges, voting powers, limitations, restrictions and qualifications thereon not inconsistent with law as shall be expressed in its articles of incorporation, or any amendment thereto. Stock without par value which is preferred as to dividends, or as to its distributive share of the assets of the corporation upon dissolution, may be made subject to redemption at such times and prices as may be determined in such articles of incorporation, or any amendment thereto. In the case of stock without par value which is preferred as to its distributive share of the assets of the corporation upon dissolution, the amount of such preference shall be stated in the articles of incorporation, or any amendment thereto.
Iowa Code § 493.1
2012 Acts, ch 1017, § 95