Saudi Arabian Oil Company as invited banks to pitch for an advisory position on what is expected to be the world's biggest initial public offering, sources familiar with the matter told Reuters on January 24, 2017. Morgan Stanley and HSBC are among banks that have received the request for proposals, one of the sources told Reuters, with the other adding that the invitation was to evaluate Aramco's business and help it with measures surrounding the share sale. Morgan Stanley declined to comment. HSBC declined to comment. Aramco was not immediately available to comment.