 The U.S.-listed shares of Hong Kong-based investment holding company AMTD IDEA Group AMTD, 306.77 skyrocketed 312.5 and subsidiary AMTD Digital Inc. HKD, 149.55 , a Hong-Kong-based digital solutions applications developer, rocketed 149.6 in very volatile afternoon trading Tuesday, enough to make them the two best performers listed on the New York Stock Exchange. AMTD IDEA shares have been halted once for volatility since the open, while AMTD Digitals stock has been halted 18 times. 