The Securities and Exchange Commission reportedly launched its probe after Musk's brother Kimbal sold $108 million in Tesla stock last year, just a day before a significant drop in the electric car maker's share price, which was catalysed by Tesla CEO's now infamous tweet
Tesla stock value fell sharply after Elon Musk posted a Twitter poll asking whether he should sell 10 percent of his stake in the company. (Credits: JIM WATSON / AFP)