Since December, Tesla's stock has dropped roughly 25%. Musk still holds around 16% of the automaker, a stake currently valued at close to $187 billion. The increase puts Ellison's estimated fortune at$393 billion, per Bloomberg Billionaires Index, ahead of Musk, who is worth $385 billion. The rise marks the sharpest one-day rise ever for a member of the index, the outlet reported. Ellison, 81, owns 41% – about 1.16 billion shares – of the software giant he cofounded in 1977. Oracle market value rocketed af ...