Saudi Stocks Decline Most Since May as Egyptians Defy Curfew

Saudi Arabian shares retreated the most since May on concern political unrest could spread in the Middle East after Egyptian protesters clashed with police and the North African country’s president refused to resign.

The Tadawul All Share Index tumbled 6.4 percent, the most since May 25, to 6,267.22 at the 3:30 p.m. close in Riyadh. All but one of the 146 shares fell. Saudi Basic Industries Corp., the world’s largest petrochemical maker, slumped 7.5 percent. Savola Azizia United Co., a food producer with subsidiaries in Egypt, dropped 10 percent, the maximum fluctuation allowed in a single trading session.