Ind. Code § 23-2-3.1-6.5
No takeover offer may be made which is not made to all offerees holding the same class of equity securities of the target company on substantially equivalent terms. A takeover offer to purchase less than any or all equity securities of the same class of the outstanding equity securities of the target company is not considered as having been made to all offerees of that class on substantially equivalent terms if the pro rata portion of equity securities of that class tendered by any offeree which will be accepted by the offeror is not equal to the highest pro rata portion of equity securities of that class tendered by any other offeree which will be accepted by the offeror. A takeover offer permitting offerees to elect to receive one (1) or more differing kinds of consideration is not considered as having been made to all offerees holding the same class of equity securities of the target company on substantially equivalent terms if proration occurs and the pro rata share of any one (1) or more differing kinds of consideration which is allocable to any offeree is not equal to the highest pro rata share allocable to any other offeree.
IC 23-2-3.1-6.5