Saudi Arabia (SABIC) will open up its stock market to foreign investors in the first half of 2015, providing greater access to the Arab world’s biggest exchange. The Capital Market Authority will publish next month rules for participation by qualified foreign financial institutions in the market, the regulator said in a statement on its website. The Tadawul All Share Index surged 3 percent to 10,046.64, the strongest level since May 2008, as of 12:21 p.m. in Riyadh.