https://www.reuters.com/article/us-china-regulation-data/china-widens-clampdown-on-overseas-listings-with-pre-ipo-review-of-firms-with-large-user-data-idUSKCN2EG04D >SHANGHAI (Reuters) -China's cyberspace regulator said on Saturday any company with data for more than 1 million users must undergo a security review before listing its shares overseas, broadening a clampdown on its large "platform economy".