The Tesla boss said he was back to working "24/7" and that he needed to focus on his companies, including Tesla. The stock is up sharply since April lows.

The top five companies -- Apple, Microsoft, Nvidia, Amazon, and Alphabet -- currently have a collective market value of $14 trillion, and Tesla is worth about $1 trillion. So, Musk's prediction currently implies 1,300% upside as the company leans into major opportunities in autonomous driving and robotics products.

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