 MT. PLEASANT, Mich., Sept. 1, 2021 PRNewswire -- Isabella Bank Corporation OTCQX: ISBA, the Corporation or Isabella announced today that it has commenced a modified Dutch auction tender offer the Tender Offer to purchase for cash up to 20,000,000 of shares of its common stock the Common Stock at a price per share not less than 23.00 and not greater than 27.00, less any applicable withholding taxes and without interest. 