China's share of global stock market cap plunges as Alibaba, Tencent falter

China's share of global stock market cap plunges as Alibaba, Tencent falter

FILE PHOTO: A bell bearing the logo of the Shenzhen Stock Exchange is seen during a companies listing ceremony in Shenzhen, Guangdong province February 25, 2011. REUTERS/Stringer/File Photo

As Chinese tech companies struggle with an economic slump and fall behind in artificial intelligence, US corporations now account for nearly half of global stock market value, the highest level of concentration in two decades.