The UK Financial Conduct Authority (FCA) has fined Wise CEO Kristo Käärmann £350,000 for failing to promptly disclose a tax default, citing a breach of Senior Management Conduct Rule 4. He was fined for deliberately failing to notify HMRC of a capital gains tax liability after he sold shares worth £10m in 2017. In September 2021, HMRC subsequently added Mr Käärmann to their public tax defaulters list.