 AMTD Idea NYSE: AMTD and AMTD Digital NYSE: HKD are both jumping in pre-market trading today, with AMTD stock soaring more than 400 to 11.61 at one point and HKD stock advancing 14.6 to 799. Hong Kong-based AMTD Idea is an investment bank, while its subsidiary, AMTD Digital, has created digital tools that perform functions related to financial services. 