Hong Kong stock debuts are losing steam as a deluge of initial public offerings (IPOs) overwhelms investor appetite. Seven of September’s 12 IPOs fell on the first day of trading, raising the third-quarter total to 15 flops out of 31, based on Bloomberg data. By contrast, there were only 14 declines among 77 debuts in the first half of the year. Medcaptain Medical Technology led September’s first-day flops, plunging 43 per cent. Fast-fashion giant Shein tumbled as much as 10 per cent on its...