The Saudi Arabian index <.TASI> shed 0.5% in early trading, as Riyad Bank declined 2.1% and National Commercial Bank, the kingdom's largest lender by assets, decreased 1.2%.
Saudi Arabian Mining Co (Ma'aden) slid 1.2%, having signed a cooperation agreement with Russia's PhosAgro to support food security.
The Qatar index <.QSI> edged up 0.1%, with lender Masraf Al Rayan gaining 1.6%. Ooredoo inched up 0.3% after subsidiary Indosat agreed to sell 3,100 towers to two buyers.
Dubai's index <.DFMGI> dropped 0.4%, hit by real estate stocks. Emaar Properties lost 1.1%, while its unit Emaar Development was down 2.7%.
But Deyaar Development rose 3%, extending gains. On Sunday the developer said its board will meet on Wednesday to approve third-quarter results.
Abu Dhabi's index <.ADI> was also down 0.4% as First Abu Dhabi Bank, the country's largest lender, slipped 0.7% while International Holding plunged 4.8%.
(Reporting by Ateeq Shariff in Bengaluru; editing by John Stonestreet)