OKX, part of the OK Group, is one of the most prominent crypto trading exchanges operated by Seychelles-based Aux Cayer FinTech Co. Ltd and Malta-based OKEX Malta Ltd. The Chinese Xu Mingxing founded the OK Group, which also owns the crypto exchange Okcoin, in 2017. The Spanish regulator CNMV has issued a warning against OKX, stating that the Group has no authorization to offer its regulated services in Spain. Most recently, the UK FCA has made several critical statements about the world's largest crypto exchange Binance.