
Twitter Inc (NYSE:TWTR) shares are up 30.4% this week after Tesla Inc (NASDAQ:TSLA) CEO and world's richest man Elon Musk disclosed a new 9.2% ownership stake in Twitter and announced on Tuesday joined Twitter's board of directors.
Musk tweeted he is already "working with [Twitter CEO Parag Agrawal] & Twitter board to make significant improvements to Twitter in coming months!"