Forbes magazine has named the 400 richest people in the United States.
And talk about high-tech: many spots in the top 20 are taken up by entrepreneurs who made a fortune working in computers or online.
Here are the top 20 billionaires on the Forbes 40:
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But some new faces grace the top 10 this year. One of them is Amazon CEO Jeff Bezos, who came in fourth with a net worth of $47 billion — a jump of $16.5 billion, the highest gains of any other billionaire on the list.
Also joining the top 10 was 31-year-old Facebook CEO Mark Zuckerberg, who sat at number seven with a net worth of $40.3 billion.
Forbes said that joining the 400 list was "harder than ever" this year, as entrants had to have a net worth of at least $1.7 billion, the "highest it's been in the 34 years" that the magazine has ranked wealthy Americans.
Last year, people needed a net worth of $1.55 billion to crack the Forbes 400.
The youngest person on the list was 25-year-old Snapchat founder Evan Spiegel, who's worth $2.1 billion.
Among the top women in the ranking was Wal-Mart scion Alice Walton, who was in 11th place overall with a net worth of $32 billion, followed by sister-in-law Christy Walton ($30.2 billion) at 14th place, and Jacqueline Mars ($23.4 billion), who was tied at 18th place with brothers John and Forrest Jr.