The day before which an investor must have purchased the stock in order to receive the dividend. On the ex-dividend date, the previous day's closing price is reduced by the amount of the dividend (rounded up to the nearest eighth) because purchasers of the stock on the ex-dividend date will not receive the dividend payment. This date is sometimes referred to simply as the 'ex-date,' and can apply to other situations; for example, splits and distributions. If you purchase a stock on the ex-date for a split or distribution you are not entitled to the split stock or that distribution. However, the opening price for the stock will have been reduced by an appropriate amount, as on the ex-dividend date. Weekly financial publications, such as Barron's, ofte