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Bill Gates is a mainstay in world ’ s rich lists , and in 2018 , Forbes estimated that the Microsoft founder had a net worth of $ 90bn , making him the second richest technology billionaire in 2018 . Today , Gates owns just 1 % of the technology firm , having sold or given away much of his stake in the company . He focuses predominantly on its philanthropic work . With this wife Melinda , he chairs the Bill & Melinda Gates Foundation , the world ’ s largest private charitable foundation , which works to save lives and improve global health . www . microsoft . com FEBRUARY 2019