Hong Kong’s vast lead over Singapore as a listing venue appears unassailable, with even the Southeast Asian city’s home-grown companies heading north to raise funds, but the city state remains determined to improve its allure, according to bankers and analysts.IFBH, a Singapore-incorporated Thai firm that is the world’s second-largest bottler of coconut water, started trading on the Hong Kong stock exchange on Monday after completing a HK$1.16 billion (US$147 million) initial public offering...