Angry Chinese nationalists finally woke up on Wednesday to the fact that Japanese and American companies own more than half of e-commerce juggernaut Alibaba, and have done for years. “Who is Jack Ma working for?” asked some on microblogs, hours after Alibaba Group Holding Ltd filed a prospectus for an initial public offering of its shares in the United States, which some say could be the biggest listing ever of a technology stock. Ma was the lead founder of Alibaba in 1999 and has become something of a cult hero to entrepreneurs and many ordinary Chinese, saying he champions small business against industry giants. “Jack Ma is a big traitor,” wrote another user on Tencent Weibo, a major Twitter-like Chinese microblogging site.