<P> Notably, the Forbes 400 Richest Americans list is published annually since 1982 . The combined net worth of the 2017 class of the 400 richest Americans was $2.7 trillion, up from $2.4 trillion in the previous year . As of November 2017, the U.S. had 576 billionaires . </P> <P> As of March 2018, according to Forbes, the top 15 billionaires are the following . </P> <Table> <Tr> <Th> Rank </Th> <Th> Name </Th> <Th> Net worth (USD) </Th> <Th> Age </Th> <Th> Sources of wealth </Th> <Th> Participation in The Giving Pledge </Th> </Tr> <Tr> <Td> 7000100000000000000 ♠ 1 </Td> <Td> Bezos, Jeff Jeff Bezos </Td> <Td> $112 billion </Td> <Td> 54 </Td> <Td> Amazon.com </Td> <Td> No </Td> </Tr> <Tr> <Td> 7000200000000000000 ♠ 2 </Td> <Td> Gates, Bill Bill Gates </Td> <Td> $90 billion </Td> <Td> 62 </Td> <Td> Microsoft, Cascade Investment </Td> <Td> Yes (founder) </Td> </Tr> <Tr> <Td> 7000300000000000000 ♠ 3 </Td> <Td> Buffett, Warren Warren Buffett </Td> <Td> $62 billion </Td> <Td> 87 </Td> <Td> Berkshire Hathaway </Td> <Td> Yes (founder) </Td> </Tr> <Tr> <Td> 7000400000000000000 ♠ 4 </Td> <Td> Zuckerberg, Mark Mark Zuckerberg </Td> <Td> $71 billion </Td> <Td> 33 </Td> <Td> Facebook </Td> <Td> Yes </Td> </Tr> <Tr> <Td> 7000500000000000000 ♠ 5 </Td> <Td> Koch, David H. David H. Koch </Td> <Td> $60 billion </Td> <Td> 82 </Td> <Td> Koch Industries, inherited </Td> <Td> No </Td> </Tr> <Tr> <Td> 7000500000000000000 ♠ 5 </Td> <Td> Koch, Charles Charles Koch </Td> <Td> $60 billion </Td> <Td> 77 </Td> <Td> Koch Industries, inherited </Td> <Td> No </Td> </Tr> <Tr> <Td> 7000700000000000000 ♠ 7 </Td> <Td> Ellison, Larry Larry Ellison </Td> <Td> $58.8 billion </Td> <Td> 73 </Td> <Td> Oracle Corporation </Td> <Td> Yes </Td> </Tr> <Tr> <Td> 7000800000000000000 ♠ 8 </Td> <Td> Bloomberg, Michael Michael Bloomberg </Td> <Td> $50 billion </Td> <Td> 76 </Td> <Td> Bloomberg LP </Td> <Td> Yes </Td> </Tr> <Tr> <Td> 7000900000000000000 ♠ 9 </Td> <Td> Page, Larry Larry Page </Td> <Td> $48.8 billion </Td> <Td> 44 </Td> <Td> Alphabet </Td> <Td> No </Td> </Tr> <Tr> <Td> 7001100000000000000 ♠ 10 </Td> <Td> Brin, Sergey Sergey Brin </Td> <Td> $47.5 billion </Td> <Td> 44 </Td> <Td> Alphabet </Td> <Td> No </Td> </Tr> <Tr> <Td> 7001110000000000000 ♠ 11 </Td> <Td> Walton, Jim Jim Walton </Td> <Td> $46.4 billion </Td> <Td> 69 </Td> <Td> Walmart, inherited </Td> <Td> No </Td> </Tr> <Tr> <Td> 7001120000000000000 ♠ 12 </Td> <Td> Walton, S. Robson S. Robson Walton </Td> <Td> $46.2 billion </Td> <Td> 73 </Td> <Td> Walmart, inherited </Td> <Td> No </Td> </Tr> <Tr> <Td> 7001130000000000000 ♠ 13 </Td> <Td> Walton, Alice Alice Walton </Td> <Td> $46 billion </Td> <Td> 68 </Td> <Td> Walmart, inherited </Td> <Td> No </Td> </Tr> <Tr> <Td> 7001140000000000000 ♠ 14 </Td> <Td> Adelson, Sheldon Sheldon Adelson </Td> <Td> $38.5 billion </Td> <Td> 84 </Td> <Td> Las Vegas Sands Corporation </Td> <Td> No </Td> </Tr> <Tr> <Td> 7001150000000000000 ♠ 15 </Td> <Td> Ballmer, Steve Steve Ballmer </Td> <Td> $38.4 billion </Td> <Td> 61 </Td> <Td> Microsoft </Td> <Td> No </Td> </Tr> </Table> <Tr> <Th> Rank </Th> <Th> Name </Th> <Th> Net worth (USD) </Th> <Th> Age </Th> <Th> Sources of wealth </Th> <Th> Participation in The Giving Pledge </Th> </Tr>

Who has the most net worth in the us