Twitter shares shoot up 25% after Elon Musk discloses he's taken a 9.2% stake in the social-media giant

Twitter shares soared almost 25% on Monday after Elon Musk disclosed he'd taken a big stake in the social-media company.

The billionaire investor bought 73,486,938 shares of Twitter stock for a 9.2% stake in the company, a Securities and Exchange Commission filing showed. The holding is worth about $2.9 billion, based on the stock's closing price of $39.31 Friday.

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