Ever since the Hong Kong Stock Exchange (HKEX) overhauled its listing rules to welcome pre-revenue biotech companies in April 2018, Hong Kong has become the largest biotech fundraising hub in Asia, and the second largest in the world after Nasdaq, HKEX executives said Tuesday at the bourse’s biotech summit. The biotech IPO pipeline continues to grow and pre-revenue companies are more accepted into the city’s financial system.