Billionaire

A billionaire is a person with a net worth of at least one billion (1,000,000,000, i.e., a thousand million) units of a given currency, usually of a major currency such as the United States dollar, euro, or pound sterling. It is a sub category of ultra high-net-worth individual. The American business magazine Forbes produces a global list of known U.S. dollar billionaires every year and updates an Internet version of this list in real-time.[1] The American oil magnate John D. Rockefeller became the world's first confirmed U.S. dollar billionaire in 1916.[2]

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As of 2018,^[update] there are over 2,200 U.S. dollar billionaires worldwide, with a combined wealth of over US$ 9.1 trillion,[3] up from US$7.67 trillion in 2017.[4][5] According to a 2017 Oxfam report, the top eight richest billionaires own as much combined wealth as "half the human race".[6][7] As of 2021, eight people have reached the status of USD hectobillionaires, meaning that each has had a net worth of at least $100 billion.[8]