The donation was worth $5.74 billion, based on the closing prices of Tesla shares on the five days that he donated the stocks

Tesla chief executive Elon Musk donated a total of 5,044,000 shares in the world’s most valuable automaker to a charity from Nov. 19 to Nov. 29 last year, its filing with U.S. Securities and Exchange Commission (SEC) showed on Monday.

The donation was worth $5.74 billion, based on the closing prices of Tesla shares on the five days that he donated the stocks.

The filing did not disclose the name of the charity. Late last year, the billionaire sold $16.4 billion worth of shares after polling Twitter users about offloading 10% of his stake in the electric-car maker.

He tweeted last year that he would pay more than $11 billion in taxes in 2021 due to his exercise of stock options set to expire this year. He also traded barbs with politicians Bernie Sanders and Elizabeth Warren who called on wealthy people to pay more taxes.

Analysts have said there would be a tax benefit for Musk potentially gifting Tesla stock. This is because shares that are donated to charity are not subject to capital gains tax, as they would be if they were sold.

His tax benefit would be huge. He’d save between 40% and 50% of the $5.7 billion in tax, depending on whether he could take the deduction against his California income and he’d avoid the gains tax he would have to pay if he sold the stock, Bob Lord, an associate fellow at the Institute for Policy Studies who studies tax policy, said.

He said Musk might have contributed the stock to intermediaries such as ‘donor-advised funds’, not outright to charitable groups.

Musk’s public philanthropy gestures have so far trailed other billionaires. Musk and Amazon.com Inc founder Jeff Bezos have donated less than 1% of their net worth, whereas Warren Buffett and George Soros had given away more than 20% of their net worth as of early September, according to Forbes.