Meanwhile, state-owned Saudi Aramco announced last month plans to offer stock in a new joint venture refinery in Yanbu. In addition, Saudi Aramco and Japan's Sumitomo Chemical Company Limited plan to invest in an upgrade of the Rabigh refinery as well as construction of a petrochemical plant. Saudi Basic Industries Corporation (SABIC) has announced plans to expand a number of petrochemical projects, and to float for public subscription 35 percent of the shares of the National Petrochemicals Company ‘Yansab’.