He s got guts, I ll give him that, said Ross Gerber, chief executive officer of Gerber Kawasaki Wealth & Investment Management, which has a $5 million position in Tesla and has recently been selling shares.

He really pushes it out on his companies, but Elon could implode.

As it is, only about 4 percent of his net worth is tied up in SolarCity, of which he s the chairman and largest shareholder.

If the proposed acquisition by Tesla doesn t come to pass, and SolarCity burns out, Musk will take a relatively minor hit.He suffered one Thursday, when his fortune, on paper, shrank by $779 million, according to the Bloomberg Billionaires Index.

That was due to two factors: drops in the companies stock prices; and Wednesday s regulatory filing showing he has put up an additional $489 million of his Tesla and SolarCity stock as collateral to secure personal borrowings.

The pledged shares are stripped out of his total net worth calculation because they re not immediately available to him.

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