If a corporation has more than one class of shares outstanding, the holders of the outstanding shares of a class are entitled to vote as a separate voting group, if shareholder voting is otherwise required by this chapter, on a proposed amendment to the articles of incorporation if the amendment would:
If a proposed amendment would affect a series of a class of shares in one or more of the ways described in this section, the holders of shares of that series are entitled to vote as a separate voting group on the proposed amendment.
If a proposed amendment that entitles the holders of two or more classes or series of shares to vote as separate voting groups under this section would affect those two or more classes or series in the same or a substantially similar way, the holders of shares of all the classes or series so affected shall vote together as a single voting group on the proposed amendment, unless otherwise provided in the articles of incorporation or required by the board of directors.
A class or series of shares is entitled to the voting rights granted by this section although the articles of incorporation provide that the shares are nonvoting shares.
SDCL 47-1A-1004