Five new stocks debuted in Hong Kong today, showing varied performances in grey market trading. Midland Realty (02671.HK) saw a 30% increase, while 51 Vision (06651.HK) rose by 45%. In contrast, Xunce (03317.HK) experienced a 35% decline. Lin Qingxuan (02657.HK) shares surged over 27%, whereas WoAn Robotics (06600.HK) fell nearly 15%.