Tesla CEO Elon Musk sold $930 million in shares to pay tax withholding obligations connected to the exercise of stock options. Musk sold 934,091 shares after executing stock options worth $2.1 billion on Monday.

During the last six trading days, Musk has sold a total of $7.8 billion in Tesla shares, and not all of the sales have mentioned tax withholding needs.

Musk held a Twitter poll earlier in the month asking if he should sell 10% of his stock in the firm, which would be worth $20 billion. He committed to following the results if they were in favor of the sale.

Stock options are a type of remuneration that allows an employee to acquire shares at a pre-determined price, known as the strike price, increasing the value of the shares as the market price rises.

Musk exercised his option to buy 2.1 million shares at $6.24 a share on Monday, and he’ll have to pay the difference between the strike price and fair market value, which will be taxed as ordinary income.

Musk has until August of next year to exercise 23 million shares of stock that he was awarded in 2012. August is also the deadline for paying grant-related taxes. However, many of his stock sales this week do not appear to be related to his tax withholding obligations.

The billionaire has exercised his stock option for the second time in a week. After exercising options to purchase over 2.2 million shares, he sold another 934,000 shares for $1.1 billion last Monday.

The two option-related sales were put up in September using a trading strategy that permits company insiders to arrange preplanned transactions. Musk had an option to acquire 22.86 million shares as of the end of 2020, which would expire in August of the following year.