AMTD Digital falls 79% as trading volume wanes after a massive surge briefly valued the Chinese tech firm at over $400 billion 9 minutes ago | By Spencer Platt/Getty Images Shares of high-flying AMTD Digital fell as much as 79% over the past two days as trading volume declined. The obscure Chinese-tech firm was briefly worth more than $400 billion after the stock surged on no news. The thinly traded stock saw less than 100,000 shares change hands Thursday, well below its average of 1 million shares. The obscure Chinese tech stock that saw its post-IPO gains swell to more...