The announcement of a 41 cents per share dividend by Zions Bancorp (ZION) is significant for investors, as the stock is expected to open lower by the dividend amount on the ex-dividend date. This is a common occurrence as the dividend payout is reflected in the stock's price, leading to a temporary decrease. Investors holding the stock by the end of Tuesday are eligible for the dividend, which could influence trading behavior leading up to the ex-dividend date.