Saudi Aramco has appointed advisory firm Brunswick to join FTI Consulting in running media and investor relations for what is set to be the world’s largest initial public offering (IPO), sources stated to Reuters.

As informed on Zawya, the decision to split the role underscores the huge task facing Saudi Arabia’s national oil giant, which hopes to list in 2018 in several countries around 5% of the company in a share sale, which could raise $100b.

Brunswick was recently appointed to run the external and media communications for the IPO while U.S.-based FTI will focus on managing investor relations. All the companies involved declined to comment on the matter.

Saudi Aramco will list its shares on the Kingdom’s stock exchange as well as one or more foreign stock exchanges, according to Deputy Crown Prince, Mohammed bin Salman. London, New York and Hong Kong have been named as possible exchanges for the listing.