Riyadh's market index ended at 6,450.68 points (0.56% higher) s oil prices surged near $79 per barrel. Consequently, energy and petrochemicals led the advance. But investors also booked profits e. g. at Yanbu National Petrochemical Company (down 0.59% at SR42.70). The largest advance was posted by Arabia Insurance Cooperative Company (up 10% atSR22.00).