Warren Buffett on Monday donated roughly $3.17bn (£2.46bn) of Berkshire Hathaway stock to the Bill & Melinda Gates Foundation and four family charities, his largest contribution in a more than decade-long plan to give away his fortune.
Berkshire said Mr Buffett, 86, has made $27.54bn in donations since 2006 to the five charities, including roughly $21.9bn to the Gates Foundation.
Mr Buffett also donated to the Susan Thompson Buffett Foundation, named for his late first wife, and the Howard G. Buffett, Sherwood and NoVo Foundations, respectively overseen by his children, Howard, Susan and Peter.
Following Monday's donation, Mr Buffett remained the world's fourth-richest person, according to Forbes magazine.
Before the donations were announced, Forbes estimated Mr Buffett's net worth at $76.3bn, trailing Microsoft co-founder Bill Gates' $89.4bn, Amazon founder Jeff Bezos' $84.8bn, and Spanish retailing magnate Amancio Ortega's $81.8bn.
Mr Gates is a close friend of Mr Buffett and a Berkshire director.
Mr Buffett typically reduces the number of shares he donates by 5 per cent from the prior year.
The charities usually sell the Berkshire shares to finance their activities, reflecting Mr Buffett's desire that his money be spent. Mr Buffett also makes smaller donations to other charities.
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