In 2017, fell to 12th place in 2018, giving away an estimated $138 million to their Bill & Melinda Gates Foundation. which invites billionaires to commit to giving away the majority of their money to charity.

In 2017, fell to 12th place in 2018, giving away an estimated $138 million to their Bill & Melinda Gates Foundation. which invites billionaires to commit to giving away the majority of their money to charity.