Saudi Arabia's oil company Aramco is now listed and has started trading on the Saudi Tadawul stock exchange. Saudi Aramco's pre-market auction bids have ended at 35.2 riyals (9.39 U.S. dollars), which is an increase of 10 percent. The state-owned company's 25.6 billion U.S. dollar initial public offering set the record as the largest in history. It is now the world's most valuable company, worth 1.7 trillion U.S. dollars.