Saudi Kayan Petrochemical Co. declined the most since December after announcing a loss in the third quarter as production, sales and prices all fell. The chemicals company part-owned by Saudi Basic Industries Corp. retreated 9.5 percent to 9.20 riyals at the close in Riyadh, leading a slide in the Tadawul All Share Index. About 21 million shares were traded, more than two-and-a-half times the three-month daily average, according to data compiled by Bloomberg. Kayan reported a 13.81 million-riyal ($3.6 million) loss for the third quarter, compared with a 66.91 million-riyal profit a year earlier. The mean of three analyst estimates compiled by Bloomberg was for a profit of 45 million riyals. The loss was due to a decrease in production, sales and average selling prices, Kayan said in a statement to the Saudi bourse on Thursday. Brent crude, a benchmark for half the world’s oil, has tumbled more than […]