Tesla chief executive Elon Musk sold about $5 billion in shares, the billionaire reported in filings on Wednesday, just days after he polled Twitter users about selling 10 per cent of his stake.
In his first share sale since 2016, Mr Musk's trust sold nearly 3.6 million shares in Tesla, worth around $4bn, while he also sold another 934,000 shares for $1.1bn after exercising options to acquire nearly 2.2 million shares.
The 4.5 million shares equate to about 3 per cent of his total holdings in the electric vehicle manufacturer, which makes up the vast part of his estimated $281.6bn fortune, according to Forbes.
Mr Musk on Saturday polled Twitter users about selling 10 per cent of his stake, helping to push down Tesla's share price after a majority on Twitter said they agreed with the sale.
The stock sank 12 per cent on Tuesday in a multi-day sell-off that endangered the company's position in the $1 trillion club, but recovered 4.3 per cent on Wednesday.
The options-related sales were set up in September through a trading plan that allows corporate insiders to establish pre-planned transactions on a schedule, the filing said. The sales of the option-related shares paid for associated taxes. It was not clear how or whether the trading plan related to Mr Musk's Twitter poll. Tesla did not respond to a request for comment.
The additional share sales were separate and provide Mr Musk with sizeable reserves of cash, given his wealth is largely tied to his stakes in Tesla and SpaceX.
Mr Musk has more than 20 million further stock options that are due to expire in August next year.
If Mr Musk carried out the 10 per cent stock sale plan, it would be a slight negative near term, said Mark Arnold, chief investment officer at Hyperion Asset Management in Brisbane where Tesla is the top holding in its global fund.
"But the stock is pretty liquid and it's not a huge percentage of total issued shares, so it shouldn't have that much of an impact ... we're quite comfortable with the outlook for the business," he said.
While Tesla has lost close to $150bn in market value this week, retail investors have been net buyers of the stock. Some 58 per cent of Tesla trade orders on Fidelity's brokerage website on Wednesday were for purchases, rather than sales.
Retail investors made net purchases of $157 million on Monday and Tuesday, according to Vanda Research.
Tesla is now up more than 51 per cent in 2021, thanks largely to an October rally that was fuelled by an agreement to sell 100,000 vehicles to rental car company Hertz.
"The company itself is on fire, with strong results," said Tim Ghriskey, a senior portfolio strategist at New York-based investment management firm Ingalls and Snyder.
Bullish sentiment returned to Tesla's options on Wednesday, with about 1.1 calls traded for every put. Calls are typically used for bullish trades, while buying puts shows a bearish bias.
The company's options accounted for about $109bn in premium changing hands over the past two weeks, or about one in every three dollars traded in the US-listed options market, according to a Reuters analysis of Trade Alert data.