Among the billionaires, the biggest winners this year have been industrialists, whose wealth rose a staggering 44% in the three months to July.
"Industrials benefited disproportionately as markets priced in a significant economic recovery [after lockdowns around the world]," UBS said.
Tech billionaires have also had a good pandemic, seeing their wealth soar 41%. UBS said this was "due to the corona-induced demand for their goods and services" and social distancing accelerating "digital businesses [and] compressing several years' evolution into a few months".
Healthcare billionaires also benefited as the crisis put drug makers and medical device companies in the spotlight.
The rise in fortunes reflects the generally strong performance of global stock markets since late March, despite most countries continuing to suffer sharp recessions.
Amazon boss Jeff Bezos and Tesla founder Elon Musk - both multi-billionaires - saw their wealth hit new highs this summer thanks to growth in the price of their companies' stock.