China's top securities regulator defended their crackdown on various industries in a private meeting with Wall Street executives, Bloomberg News reported on Saturday. Investors' concerns over the regulatory crackdown has led to sharp sell-offs on China's share markets, reducing the market capitalisation of some of its largest companies including Alibaba Group Holding Limited. China Securities Regulatory Commission (CSRC) Vice Chairman Fang Xinghai explained during the meeting that recent actions were taken to strengthen regulations for companies with consumer-facing platforms, and improve data privacy and national security, the report said, citing people familiar with the matter.