Tesla Inc shares fell for the fourth straight session on Wednesday, putting at risk the electric-car maker’s position in the $1 trillion club after top boss Elon Musk polled Twitter users about selling 10% of his stake. Shares fell as low as 3.5% to $987.31 in volatile early trading, briefly pushing its market value below the $1 trillion mark. The company has lost nearly $200 billion since Monday following Musk’s poll, more than General Motors and Ford Motor combined market capitalisation. The world’s most valuable carmaker entered the elite trillion-dollar club last month after landing its biggest-ever order from rental car company Hertz for 100,000 Tesla vehicles.

The selloff was spurred by Musk’s poll over the weekend asking his Twitter followers if he should sell 10% of his stake in Tesla. Nearly 58% of them backed a sale. Investors are keeping a close watch on Tesla filings with the US Securities and Exchange Commission (SEC) for any clues on the share-sale plans. The SEC rules give companies four working days to report major events. Analysts at research firm Vanda Research warned there could be a bigger pullback based on call options activity in the stock.

Four former and current Tesla board members, including Musk’s brother Kimbal Musk, filed to sell nearly $1 billion worth of shares late last month, according to filings and market data.

“A CEO asking his followers if he should sell a large number of shares is never going to reflect well in the share price. Doing so a day after his brother has sold a large number just compounds investor fears,” said Craig Erlam, market analyst at Oanda. “That said, we need to take Musk with a pinch of salt and investors may quickly view this as a dip buying opportunity,” he added. Despite the selloff, the stock is still up nearly 45% for the year after hitting a series of record highs in an eye-watering rally that catapulted the company into the trillion-dollar club.