Dorsey is said to have told the board that "he and Mr. Musk were friends," according to the filing. In the meeting, the Twitter board discussed wanting Musk to agree to "'standstill' provisions"," according to the filing. This would effectively "limit his public statements regarding Twitter, including the making of unsolicited public proposals to acquire Twitter (but not private proposals) without the prior consent of the Twitter Board." April 4: Surprise! Musk becomes Twitter's largest shareholder Musk is revealed to be Twitter's largest individual shareholder, with a more than 9% stake in the company. News of the purchase sends shares of the social media company soaring more than 20% in early trading and kicks off a wave of speculation about how Musk might push for changes on the platform. April 5: Musk agrees to join the board Twitter CEO Parag Agrawal announces Musk will join Twitter's board of directors.