41,400 millionaires supposedly left since 2017 when summing up all the migration estimates New World Wealth has reported for the UK since 2017. But there are 435,000 more millionaires in the UK today according to the UBS Global Wealth 2025 report. The total number of millionaires that New World Wealth claims left the UK since 2017 sum up to just 2% of the UK’s millionaire population in 2017 (2.2 million). But the UK’s millionaire population today is 20% bigger than it was it 2017 according to UBS.