Which nations will see fastest growth in billionaire populations by 2031?

Billionaire numbers are expected to grow fastest in Saudi Arabia, rising from 23 in 2026 to 65 in 2031, according to Knight Frank's The Wealth Report 2026. Poland's billionaire population is also expected to more than double, from 13 to 29 during the same period. It will be followed by Sweden, Australia, Denmark, Japan, Mexico, the Philippines, Norway and India.