This get's into questions of what is an is not a good proxy for actual intelligence. IQ tests are more likely to become arbitrary rankings once you looking at ever smaller population sizes and thus relative poor proxy's for g.
Still, Roughly one third to one half of the billionaires (45.0%),
Fortune 500 CEOs (38.6%), Senators (41.0%), and federal
judges (40.9%) attended a school requiring standardized test
scores that likely places them in the top 1% of ability. https://www.psychologytoday.com/files/attachments/56143/wai-... Further, why that's only a proxy for intelligence, those with different backgrounds may also have unusually high IQ's.
Granted we are now using a proxy for g to estimate IQ. But, as I was saying intelligence not scores on IQ test IMO it's a valid approach.