Aramco, the world’s largest oil company, said it would set a final price for its shares on Dec. 5.: Saudi Aramco, the world’s largest oil company, took another step on its lengthy path to a stock market listing on Saturday, saying that it would announce a final price for its shares on Dec. 5, with trading expected to start in mid-December. The company’s 658-page prospectus was released a week after Aramco formally announced plans to sell shares on the local Saudi stock exchange known as the Tadawul.