Saudi Arabia's benchmark index rose 0.4%, with Dr Sulaiman Al-Habib Medical Services advancing 3.1% and Sahara International Petrochemical Co climbing 4.2%
The Qatari benchmark added 0.6%, led by a 0.6% increase in Qatar National Bank and a 1.2% rise in Commercial Bank
Dubai's main share index fell 0.7%, weighed down by a 1.1% drop in Emirates NBD Bank and a 1% decline in sharia-compliant lender Dubai Islamic Bank.
"The Saudi announcement will likely negatively affect companies in the Emirates in the short-term," said Daniel Takieddine, market analyst at FXPrimus.
Saudi Arabia's benchmark index added 0.2%, with Al Rajhi Bank rising 0.9% and Sahara International Petrochemical Company (Sipchem) jumping 5.6% after proposing a first-half dividend of 0.75 riyal per share.
Egypt's blue-chip index declined 2.1%. Most of the stocks on the index were in negative territory, including Commercial International Bank, which dropped 2%.
Saudi Arabia's benchmark index finished 1.3% higher, buoyed by a 1.8% rise in Al Rajhi Bank and a 5.7% jump in Riyad Bank.