That's quite the boost and makes Twitter one of the big movers before the open later today. For some context, the stake makes Elon the single largest shareholder in Twitter. Here's a list of the other names (h/t @ itsTarH):

TWTR

Just last week, Musk asked about creating a new social media platform because Twitter was "failing to adhere to free speech principles and undermining democracy". ¯\_(ツ)_/¯