Following his attempt at a Twitter poll to determine if he should do the right thing (when he was going to do it all along actually) Elon Musk has sold some of his stock. According to filings, he has unloaded just north of $5B in stock options that he was granted way back in September. At least $1.1B of that will go towards tax obligations that Musk will soon owe on stock options as America seeks to stop rich people from quietly not paying taxes on stocks until they’re sold.
Musk does not actually have much of his fortune in cold hard cash but rather stocks. The new taxation rules would mean that his stock options would be taxed to keep it fair for everyone in the U.S (the same for Bezos and so on.)