Indiana Code Title 28. Financial Institutions § 28-13-5-2

Sec. 2. (a) A corporation with more than fifty (50) shareholders must hold a special meeting of shareholders on call of the corporation's board of directors or the person or persons, including shareholders or officers, specifically authorized to do so by the articles of incorporation or bylaws.

(b) If the articles of incorporation require the holding of a special meeting on the demand of the corporation's shareholders, but do not specify the percentage of votes entitled to be cast on an issue necessary to demand a special meeting, the board of directors may establish the percentage in the corporation's bylaws.  Absent adoption of a bylaw provision, the demand for a special meeting must be made by the holders of all of the votes entitled to be cast on an issue.