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Apple CEO Tim Cook has donated 50,000 shares worth approximately $6.5 million to charity, according to a new filing made with the Securities and Exchange Commission (SEC).

It's unclear which charities Cook donated to; the SEC filing does not disclose them, and Apple has refused to comment, says Wall Street Journal tech reporter Daisuke Wakabayashi. The last donation Cook did disclose was to Project One America, which promotes LGBT equality.

In stark contrast to former Apple CEO and co-founder Steve Jobs, Cook has been a keen proponent of charity since taking over in 2011. In addition to launching the employee charity program, Cook has auctioned off lunches and vowed to donate his entire fortune before he dies.

Cook has also said that he wants to pay for his 10-year-old nephew's tuition fees.

Cook's current net worth is around $120 million, according to Fortunebut he also holds restricted Apple stock worth around $665 million.

Cook did not sell any Apple shares for his own benefit, the SEC filing reveals. However, Dan Riccio, Apple Senior Vice President of Hardware Engineering, sold just over 24,000 worth approximately $3.1 million.