Musk takes 9% stake in Twitter to become top shareholder, starts poll on edit button

FILE PHOTO: Tesla CEO Elon Musk speaks during a conversation with legendary game designer Todd Howard (not pictured) at the E3 gaming convention in Los Angeles, California, U.S., June 13, 2019. REUTERS/Mike Blake

(Reuters) - Tesla Inc boss Elon Musk on Monday disclosed a 9.2% stake in Twitter Inc, worth nearly $3 billion, making him the micro-blogging site's largest shareholder and triggering a rise of more than 27% in the company's shares.

Musk's move, revealed in a regulatory filing, comes on the heels of his tweet that he was giving "serious thought" to building a new social media platform, while questioning Twitter's commitment to free speech.