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Elon Musk is the world's
trillionaire. The initial public
(IPO) of SpaceX added
$870 billion to his
. He has also amassed a fortune from Tesla, X, and other
. Mr Musk is
more than the world's next four richest people
. Most of his wealth is tied up in
, rather than in cash. SpaceX's IPO was the largest in history. It raised $75 billion. It beat the
record of $29.4 billion set by the
company Aramco.