USAS Building(02671.HK), which will be listed tomorrow, opened up 1.4% to $7.2 on gray market, and last printed at $7.5, up 5.6% from the listing price , on volume of 850,000 shares and turnover of $7.8 million, according to PhillipMart data.USAS Building(02671.HK), which will be listed tomorrow, opened up 21.1% to $8.6 on gray market, and last printed at $7.31, up 3% from the listing price , on volume of 664,800 shares and turnover of $5.68 million, according to Futu data.(HK stocks quote is delayed for at least 15 mins.)