Musk, who owns about 19% of the company’s stock, or 34.1 million shares, saw the value of his holdings jump by $4.5 billion as the company’s shares climbed more than 17% between Monday’s close and midmorning trading Tuesday. Musk has added more than $17 billion to his net worth just this year — more than any other billionaire in the world. To put that into perspective, he has made $500 million a day — or $20 million an hour — since Jan. 1.

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