The last time a stock with a tiny free float rose from relative obscurity to the ranks of the worlds largest companies, it didnt end well. AMTD Digital Inc., another US-listed company with roots in Asia, soared more than 32,000% in the span of a few weeks. AMTD has since tumbled more than 99%, hitting a record low last week. Its valuation now stands at a humble $1.2 billion.