The first day of trading when the buyer of a stock is no longer entitled to the most recently announced dividend payment ( i.e. the trade will settle the day after the record date, too late for the buyer to appear on the shareholder record and receive the dividend.) The date set by the NYSE (and generally followed on other U.S. exchanges) is currently two business days before the record date. A stock that has gone ex-dividend is denoted by an x in newspaper listings on that date. Bloomberg Financial Dictionary
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The date on which a stock goes ex dividend. After this date the right to receive a current dividend will not automatically transfer from the seller of the stock to the buyer. Exchange Handbook Glossary
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In general the date after the day that dividend has been announced. NYSE Euronext Glossary
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ex-dividend date UK US noun [C] FINANCE
► the date before which an investor must buy a share in order to have the right to receive a particular dividend (= payment): »
If an investor does not own the stock before the ex-dividend date, he or she will be ineligible for the dividend payout.
Financial and business terms. 2012.