International investors are facing new challenges in China due to a sudden regulatory clampdown affecting computer-driven trading and the IPO market. The clampdown has led to a significant impact on private equity fund managers, with about 500 canceling their accounts, 400 of which occurred on February 9, coinciding with Wu Qing's assertive stance early in his tenure as the head of the China Securities Regulatory Commission (CSRC). Additionally, the tightened rules on share listings have prompted 47 companies to pull their IPO plans in a bearish market. The crackdown has also affected high-frequency trading (HFT) firms, with instances of internet access being temporarily cut off.