https://www.reuters.com/article/us-ant-group-ipo-investors/abrupt-halt-of-ant-groups-mega-ipo-leaves-investors-guessing-idUSKBN27J2FO >Investors were left reeling by the suspension of Ant Group's $37 billion stock market listing on Tuesday, with many having spent weeks studying the deal and lobbying bankers for shares in what was set to be the world's biggest initial public offering.