An ex-dividend calendar is created by NASD and is used in selling and buying of stocks. When a seller sells a stock to a buyer, the stock is submitted be recorded with the new owners information. Approximately 2 days before the recording of the sale final dividends are paid out to the seller and these are called "ex-dividends" . The ex-dividend calendar shows the date that the seller, who
. technically no longer owns the stock, will receive their last payout. For more information check out: http://www.investorwords.com/1818/ex_dividend.html