Tesla said on Monday that it received a subpoena from the US Securities and Exchange Commission in November in connection with the SEC settlement that required Elon Musk's material information tweets to be vetted.

Musk sparked a stock sell-off after asking his Twitter followers if he should sell 10% of his interest in the firm in November, prompting the disclosure in an annual filing with the US Securities and Exchange Commission.

Since the tweet, the electric-car maker's stock has dropped by about a fourth.Tesla valuation more than nine largest carmakers combined: Why?

Tesla was sued in December over Musk's social media activities, including a Twitter poll on stock sales that dragged down the company's stock prices.

Musk agreed to have the company's lawyers pre-approve tweets with relevant information about the company in order to resolve an SEC lawsuit over his post about taking the firm private in 2018.

HOLDINGS IN BITCOIN ARE WORTH $2 BLN

Tesla announced on Monday that the fair market value of its bitcoin assets as of December 31 was $1.99 billion.

The company, which had invested $1.50 billion in bitcoin last year, said it suffered impairment losses of around $101 million due to the value of bitcoin last year.

The corporation suffered losses when the value of its holdings declined due to a drop in bitcoin's value.

Tesla had previously accepted bitcoin as payment for the sale of some products. Tesla CEO Elon Musk, on the other hand, has stopped taking the digital money, citing environmental worries over bitcoin mining.

After selling a chunk of its bitcoin holdings in March, the corporation stated it made a $128 million profit on sales. Tesla's bitcoin holdings have remained unchanged since then.