HONG KONG/NEW YORK/TAIPEI/TOKYO -- It would be the most extreme escalation yet of the rivalry between Washington and Beijing: a restriction of Chinese companies' access to U.S. finance, including their forced delisting from U.S. stock exchanges. Shares in U.S.-listed Chinese tech companies, such as Alibaba and JD.com, are yet to make up the sharp losses they suffered on Friday after Bloomberg reported that the Trump administration was discussing the idea. Japan's SoftBank, which counts Alibaba as one of its most successful investments, has also sold off.