The Abu Dhabi benchmark fell 1.8 percent as FGB tumbled 5.2 percent. Its shares no longer carry the 2014 dividend of 1.00 dirham per share or entitle their holders to the 15.38 pct bonus share issue.
Qatar's Doha Bank also fell on its ex-dividend date, tumbling 7.6 percent and dragging the Doha benchmark down 0.2 percent.
Dubai's market fell 0.7 percent as leading developer Emaar Properties dropped 2.2 percent. The firm has proposed a 2014 cash dividend of 0.15 dirham per share, the same as the cash payout proposed for 2013, but it did not match the 10 percent bonus share issue for the prior year.
Oman's bourse edged down 0.2 percent while Kuwait was flat.