Minn. Stat. § 308B.625
A restriction on the transfer or registration of transfer of membership interests of a cooperative may be imposed in the articles, in the bylaws, by a resolution adopted by the members, or by an agreement among or other written action by a number of members or holders of other membership interests or among them and the cooperative. A restriction is not binding with respect to membership interests issued prior to the adoption of the restriction, unless the holders of those membership interests are parties to the agreement or voted in favor of the restriction.
A written restriction on the transfer or registration of transfer of membership interests of a cooperative that is not manifestly unreasonable under the circumstances may be enforced against the holder of the restricted membership interests or a successor or transferee of the holder, including a pledgee or a legal representative, if the restriction is either:
Unless a restriction is in this chapter, the articles, bylaws, noted conspicuously on the face or back of the certificate, or included in information sent to the holders of uncertificated membership interests, a restriction, even though permitted by this section, is ineffective against a person without knowledge of the restriction. A restriction under this section is deemed to be noted conspicuously and is effective if the existence of the restriction is stated on the certificate and reference is made to a separate document creating or describing the restriction.
Minn. Stat. § 308B.625
2003 c 105 art 1 s 59