Mont. Code Ann. § 35-2-224

35-2-224 . Class voting by members on amendments. (1) The members of a class in a public benefit corporation are entitled to vote as a class on a proposed amendment to the articles if the amendment would change the rights of that class as to voting in a manner different from the manner in which the amendment affects another class or members of another class.

(2) The members of a class in a mutual benefit corporation are entitled to vote as a class on a proposed amendment to the articles if the amendment would:

(a) affect the rights, privileges, preferences, restrictions, or conditions of that class as to voting, dissolution, redemption, or transfer of memberships in a manner different from the manner in which the amendment would affect another class;

(b) change the rights, privileges, preferences, restrictions, or conditions of that class as to voting, dissolution, redemption, or transfer by changing the rights, privileges, preferences, restrictions, or conditions of another class;

(c) increase or decrease the number of memberships authorized for that class;

(d) increase the number of memberships authorized for another class;

(e) cause an exchange, reclassification, or termination of the memberships of that class; or

(f) authorize a new class of memberships.

(3) The members of a class of a religious corporation are entitled to vote as a class on a proposed amendment to the articles only if a class vote is provided for in the articles or bylaws.

(4) If a class is to be divided into two or more classes as a result of an amendment to the articles of a public benefit corporation or mutual benefit corporation, the amendment must be approved by the members of each class that would be created by the amendment.

(5) Except as provided in the articles or bylaws of a religious corporation, if a class vote is required to approve an amendment to the articles of a corporation, the amendment must be approved by the members of the class by two-thirds of the votes cast by the class or a majority of the voting power of the class, whichever is less.

(6) A class of members of a public benefit corporation or mutual benefit corporation is entitled to the voting rights granted by this section although the articles and bylaws provide that the class may not vote on the proposed amendment.