Valuations for Saudi Aramco vary by more than $1 trillion, according to fund managers who have seen banks’ research, underscoring the uncertainty hanging over what could be the world’s largest stock market listing. Fund managers are poring over bank research after Aramco on Sunday announced its intention to float on the Riyadh stock market. Sources have told Reuters that Aramco could offer 1%-2% of its shares, raising as much as $20 billion to $40 billion. A deal over $25 billion would top the record-breaking IPO of Chinese e-commerce giant Alibaba ( BABA.N ) in 2014. On Sunday, however, Aramco provided no size of the planned IPO, no timeframe, identified […]