https://www.reuters.com/article/china-ant-group-jack-ma/billionaire-alibaba-founder-jack-ma-reappears-in-hong-kong-sources-idUSKBN2H21MX >Alibaba Group founder Jack Ma, largely out of public view since a regulatory clampdown started on his business empire late last year, is currently in Hong Kong and has met business associates in recent days, two sources told Reuters.