AIG last night returned to the market to trim its stake in Hong Kong-listed AIA Group, following the expiry of its latest lockup on Tuesday. A deal was widely expected, but AIG nevertheless caught investors off guard by selling less than one-third of its remaining stake in the pan-Asian life insurer. At the final price, this resulted in a deal size of HK$15.9 billion ($2 billion), while many market participants had been expecting AIG to sell its entire stake in one go to raise more than $7 billion.