The donation reduces Gates stake in the software maker to 1.3 percent.
It is not clear whether Gates will remain in the top spot at the rate his charity donations are going, but the latest $4.6 billion share donation represents approximately 5 percent of Gates' current $90bn fortune. As usual, the recipient of this donation will likely be Bill & Melinda Gates Foundation.
Bill Gates has a long history of giving up his Microsoft shares. The shares were valued at US$4.6 billion (RM19.8 billion) at the time. They donated $16bn worth of Microsoft shares in 1999 and followed it up with another $5.1bn a year later.
The world's richest man gave away 64 million Microsoft shares, equivalent to five per cent of his total fortune.
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The recipient of this huge gift is unspecified in the regulatory filing, but if past practice holds, it's likely the Bill & Melinda Gates Foundation, helping to fuel the philanthropy's work in USA education and global health.
While most still have their jaws laying on the floor at the amount Gates recently donated, keep in mind, the former Microsoft CEO routinely purges himself of portions of his wealthy war chest.
His most recent donation takes Gates' overall charitable pledges around the $50 billion mark. Mr Bezos, whose fortune has risen 30 per cent since Jan 1, briefly leapfrogged Mr Gates to become the world's richest person based on intraday prices last month.
Gates' estimated net worth is $89.9 billion, as of July 2017.