Breton(01333.HK) -0.750 (-3.012%) , which will be listed tomorrow, opened up 22.2% to $22 on gray market, and last printed at $25.6, up 42.2% from the listing price , on volume of 572,000 shares and turnover of $14.2 million, according to PhillipMart data.Breton(01333.HK) -0.750 (-3.012%) , which will be listed tomorrow, opened up 11.1% to $20 on gray market, and last printed at $25.4, up 41.1% from the listing price , on volume of 466,600 shares and turnover of $11.69 million, according to Futu data.(HK stocks quote is delayed for at least 15 mins.)Related NewsCiti: HK 1Q GDP Growth Beats; Full-yr Forecasts Slightly Raised