Elon Musk recently purchased 9.2% of Twitter stock, according to a filing Monday, making him the largest shareholder in the company. News of the purchase sent shares of Twitter (TWTR) soaring 22% in early trading. Musk did not disclose what he paid for the shares, but his stake was worth $2.9 billion as of the close of trading Friday, and $3.5 billion after the spike early Monday.

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