As used in this chapter, "business combination", when used in reference to any resident domestic corporation and any interested shareholder of the resident domestic corporation, means any of the following:
proposed by, or under any agreement, arrangement, or understanding (whether or not in writing) with, the interested shareholder or any affiliate or associate of the interested shareholder, that has the effect (directly or indirectly) of increasing the proportionate share of the outstanding shares of any class or series of voting shares or securities convertible into voting shares of the resident domestic corporation or any subsidiary of the resident domestic corporation that is directly or indirectly owned by the interested shareholder or any affiliate or associate of the interested shareholder, except as a result of immaterial changes due to fractional share adjustments.
IC 23-1-43-5