Saudi Arabia on Monday named the head of its sovereign wealth fund as chairman of oil giant Aramco, replacing Energy Minister Khalid al-Falih as the state-owned company prepares for a much-anticipated initial public offering (IPO). “I congratulate… Yasir al-Rumayyan, governor of the Public Investment Fund, on his appointment as chairman of the board of directors of Saudi Aramco, which is an important step to prepare the company for the public offering,” Falih said on Twitter.