There are 1,135 billionaires living in the U.S., sitting on a collective nest egg of $5.7 trillion —but a select three uber-wealthy entrepreneurs make up nearly a fifth of the honeypot. Together, Elon Musk , Jeff Bezos , and Mark Zuckerberg account for nearly $1 trillion, amassing their fortunes through successful tech ventures. But few of these upper-class individuals are giving back through philanthropy—about a quarter of The Giving Pledge signers have known donations of less than $1 million in the last 10 years. Many are funneling billions through their own foundations in a “stealth giving” manner.

America has 1,135 billionaires and counting. According to a recent WSJ analysis of data from wealth-intelligence firm Altrata , if you put all their fortunes together, they

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