By Benjamin Horney (February 8, 2017, 4:10 PM EST) -- Moelis & Co. has been tapped to advise energy giant Saudi Arabian Oil Co., known as Aramco, on a planned initial public offering that is expected to value the energy giant at at least $2 trillion, according to a Wednesday report from Reuters. The report said Moelis will take on the role of "internal independent adviser," and will be part of the team readying the share offer and assisting with regulatory issues. An official decision is expected by next week, the report said. Reports late last month said that Goldman Sachs Group Inc., HSBC Holdings PLC, Credit Suisse Group AG and Morgan Stanley were among those in the running to land roles on the IPO, which is tentatively scheduled for the second or third quarter of next year....