Tesla Inc TSLA shares sank to their lowest level this year on Wednesday, wiping out $12.3 billion from CEO Elon Musk 's net worth, Bloomberg News reported. What Happened : Musk has lost $49 billion since announcing his formal bid for Twitter on April 14, days after revealing his stake in the microblogging company. The 50-year-old billionaire on Wednesday sent out a barrage of tweets about his political views and ESG (environmental, social, and corporate governance) ratings, besides typing out replies to dozens of other users.