According to Caixin, one of the largest options market makers in the United States, Hainan International Group, filed a lawsuit on June 29, 2026, with the U.S. Federal Court in Manhattan, New York, stating that a hundred people allegedly learned in advance about China’s May 22 regulatory crackdown on illegal cross-border stock trading. The abnormal large-volume buying of the heavily penalized Tiger Brokers and Futu Holding put options allegedly led to profits of over $100 million. According to Caixin, one possible source of the insider trading information was China’s securities regulatory authority, while another could have been individuals related to Futu or Tiger Brokers who were able to discuss enforcement actions with China’s securities regulatory authority.