Elon Musk’s love of Twitter is well-known – and now he owns a big chunk of the company. According to an SEC filing released Monday, Musk now owns over 73 million shares – or about 9.2% – of the social media company, making him the largest shareholder in the company.

News of Musk’s big buy had an impact on Wall Street, with the price of Twitter shares surging 25% after the news.

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