 MT. PLEASANT, Mich., Oct. 19, 2021 PRNewswire -- Isabella Bank Corporation the Corporation OTCQX: ISBA announced today the final results of its 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, which expired at 5:00 p.m. 