China Business & EconomyChinese-Owned Stock Trading App Is Quietly Amassing US UsersSaveMark Us Preferred on GooglePrintTraders wear masks as they work on the floor of the New York Stock Exchange on May 27, 2020. Lucas Jackson/File Photo/ReutersFan Yu12/13/2020|Updated: 12/21/2020News AnalysisThe U.S. stock market gyrations of 2020 need no introduction.We had a problem loading this article. Please enable javascript or use a different browser. If the issue persists, please visit our help center.