The Cyberspace Administration of China (CAC) said Tuesday that companies that control data of more than 1 million users will have to undergo a cybersecurity review before they seek overseas listings to “further protect online data and national security.” The change is among a list of amendments made to China’s Cybersecurity Review Measures, mainly focusing on the assessment process for proposed overseas listings of companies that hold data the authorities deem sensitive. The new measures will come into effect on February 15. The move could trigger more uncertainty around the IPO plans of a series of private tech giants and unicorns, from TikTok owner ByteDance to Alibaba fintech affiliate Ant Group. [CAC release, in Chinese]