Bill Gates has given away $4.6 billion to charity in his largest donation since 2000. He remains the world's richest person, despite giving away 64 million shares in Microsoft.The shares are equivalent to 5 percent of his total fortune, currently estimated to be $89.9 billion.
Since 1994, Gates and his wife Melinda have given away a total of $35 billion in cash and stocks to a range of charitable causes.
The donation was made in June, but became public on Monday following the filing of a document with the U.S. Securities and Exchange Commission.
Gates' share in Microsoft is now just 1.3 percent. Prior to this, Gates gave away $16 billion in Microsoft shares in 1999 and $5.1 billion in 2000.