The UBS Global Health Report 2024 states that the UK currently has 3,061,553 USD millionaires. This can be found on page 30 of the report. They predict this figure to drop by 17%, or 519,089 millionaires by 2028.

On a simple per year division basis, that would be a 129,772 drop yearly over 4 years or 103,817 yearly over 5 years (I'm uncertain the exact timings of what the figures are intended to represent).

Keir Starmer said on the day of creating this market that the October budget "Will be painful". This could accelerate the trend. https://www.bbc.co.uk/news/live/c0rw9edy00zt

Resolution Criteria
This market will be resolved based on the difference between this figure in this years report, and the 2025 UBS Global Wealth Report. If there are differences in the reports, the best way to calculate the figure will be discussed as much as possible in the comments of the market.

If the figure shows a positive trend, i.e. there was no drop in the year, the market will resolve to zero. Equally, if the figure is above the range, it will resolve to the highest value in the range (450,000).