(Shares of some Chinese companies, ranging from e-commerce giants JD.com and Alibaba to electric vehicle manufacturer Nio, declined in premarket trading Friday. Alibaba was down 2.3% and PDD lost about 3.5%, while JD.com and Nio dropped 4.8% and more than 5%, respectively. The moves come as investors' weigh China's real estate troubles, which could, in turn, impact the country's economic activity.)