Shein shares fell as much as 4.4% on Tuesday after the fast-fashion retailer reported a 67% decline in quarterly profit. The result fueled investor concerns about margin pressure and slowing growth. Since its September 1 stock market debut in Hong Kong through Monday’s close, Shein’s shares have dropped 27.3% from the HK$48.56 offer price, or $6.19. The stock traded around HK$33.82 on Tuesday.