Microsoft co-founder Bill Gates handed over 64 million shares of the software giant to his foundation in June, a US$4.68 billion donation based on current share prices, the Wall Street Journal reports.
The donation ranks as his biggest to the organization in more than a decade.
The gift, disclosed Monday in regulatory filings, is significantly larger in both value and number of shares than recent dispersals by Gates, the paper noted.
Since June 2015, Gates has regularly donated eight million shares each quarter.
A spokeswoman for the Bill & Melinda Gates Foundation declined to say why the billionaire changed his pattern of giving, or whether there would be similarly larger donations in the future, the Journal said.
The Bill & Melinda Gates Foundation has focused on global health and development, as well as educational programs in the US.
Gates has given the vast majority of his holdings to the foundation, whose endowment at the end of last year stood at US$40.3 billion.
According to the filings, Gates still holds nearly 103 million Microsoft shares, valued at US$7.54 billion.
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