The Saudi Stock Exchange's main index TASI dipped 0.39% to finish at 6,697.8 points. Trade Union Cooperative Insurance Company was the main gainer, closing 4.30% higher at SR20.60. Petrochemical giant SABIC lost 0.93%, finishing at SR106.25. Earlier in the day Pascal Moura, Head of Central and Eastern Europe Middle East and Africa Company Research at Deutsche Bank, said at the German bank's Annual MENA Equity Conference that "in Petro-chemicals, the issue surrounding possible changes in feedstock costs for the Saudi petrochemical-based companies will dominate the debate in the sector. On Thursday, the Tadawul bourse will remain closed.