Elon Musk has been fined $20 million and will be forced to resign as chairman of Tesla after reaching a settlement on fraud charges.
Musk was accused of posting "false and misleading information" to Twitter about taking his company private at $420 a share on August 7.
The acclaimed engineer told his followers he'd secured funding and only needed a shareholder vote to proceed, but this was untrue.
The US Securities and Exchange Commission (SEC) claims Musk's tweets had no factual basis, and caused chaos in the stock market, which hurt investors.
Musk's tweets saw Tesla's stock jump by more than six per cent on August 7 - but the price crashed by more than 13 per cent when the SEC filed its complaint.