Chinese e-commerce giant JD.com leapt nearly six percent on its Hong Kong debut Thursday, after raising almost $4 billion in an initial public offering that was the world’s second biggest this year. The firm, which listed on the Nasdaq in New York in 2014, opened at HK$239 in early morning trading in Hong Kong, compared with its listing price of HK$226. The new debut comes as Chinese companies — especially those in tech — eschew Wall Street because of rising tensions between Washington and Beijing.