Tesla boss Elon Musk has sold another 19.5 million shares of the electric car maker worth $3.95bn, filings with the US financial watchdog show, the BBC reports.
The news comes less than two weeks after the world’s richest man completed his $44bn takeover of Twitter.
Tesla’s share price has fallen by more than 50% since the start of this year.
Separately, Tesla is recalling just over 40,000 of its vehicles in the US because of a potential problem with their power-steering.
The reason for the latest sales, which took place in the last week, has not yet been disclosed.
The latest sale brings the total value of Tesla shares sold by Mr Musk to almost $20bn since he announced earlier this year that he had bought a stake in Twitter.
He sold $8.5bn of Tesla stock in April this year and around another $7bn worth in August.
Also in August, Tesla shareholders approved a three-for-one stock split, which is behind part of the fall in the value of the shares.