When a company goes ex-dividend it means just that. It paid a dividend. If the stock was $31.80 and paid a dividend of $1.80 the stock becomes $30 and you collected $1.80. In effect you really got nothing. It is kind of like a stock split. If a stock splits 2 for 1 and you had 500 shares of a $40 stock you now have 1000 shares of a $20 stock. It is just a balance sheet adjustment.