09/30/2015 12:57 EDT

Forbes 400 Names The Richest Billionaires In The U.S.

Talk about high tech.

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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Photo gallery The Forbes 400 List, 2015 See Gallery

Topping the Fortune 400 ranking this year was Bill Gates, who has now held the primary spot for 22 years. His net worth was $76 billion, down from $81 billion in last year's list.

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.