Statoil (STO) pays its dividend annually, and trades ex-dividend at the end of the third week of May each year (Friday, May 21 was the 2010 date). If you initiated in, or added to, STO anytime before the close of trading on the NYSE on Thursday, 5/20, you will receive this year's dividend. The dividend payout is $1.02 per share, but there is 15% Foreign Tax Withholding, so your account should show you receive .87 per share.
Be sure to send your accountant notice of the Foreign Tax Withholding. It may be included in your brokerage statement. -r.
Disclosure- I recently added to my STO position. I have been a STO shareholder since the mid-1990's.