"SAN FRANCISCO, CA--(Marketwired - Jun 14, 2013) - Advent Software, Inc. (NASDAQ: ADVS), a leading provider of software and services for the global investment management industry, today announced that NASDAQ has established July 10, 2013 as the ex-dividend date for the special cash dividend approved by Advent's Board of Directors on June 12, 2013. The dividend of $9 per share will be paid on July 9, 2013 to all stockholders of record at the close of business on July 1, 2013.
Nasdaq notified Advent of the ex-dividend date and that the effect of a July 10, 2013 ex-dividend date is that the stock trades with the dividend through and up to July 9, 2013. Any regular way transactions in the common stock will include the dividend. A record holder that sells their stock prior to July 10, 2013 would not be entitled to retain the dividend."
That extended period would also explain why there isn't a mad rush this early in the game