Bill Gates has donated $4.6bn to a charity, which reduced his share in Microsoft.
He has given away $4.6bn (£3.6bn) to charity in his largest donation since 2000.
Bill Gates remains the world’s richest person, though he has given away 64 million shares in Microsoft.
These shares are equivalent to 5% of his total fortune, currently estimated to be $89.9bn.
Since 1994 Mr Gates and his wife Melinda have given away a total of $35bn in cash and stocks to a range of charitable causes.
Bill Gates has donated the amount in June itself, but it became public on Monday following the filing of a document with the US Securities and Exchange Commission.
Mr Gates’ share in Microsoft is now just 1.3%. Prior to this, Mr Gates gave away $16bn in Microsoft shares in 1999 and $5.1bn in 2000.
The majority of all previous donations has been made to the Bill & Melinda Gates Foundation, which is primarily focused on reducing world poverty, combating infectious diseases and providing universal access to computers.
It is unknown who the recipient of this latest donation is, however, when federal documents are filed, it usually means new money is being given to a foundation, as per the reports.
This latest donation is the biggest charitable gift to have been made anywhere in the world so far this year.
The second largest was made by Mr Buffett, who donated almost $3.2bn to the Bill & the Melinda Gates Foundation last month.
And the third biggest came from Dell Computer Corporation founder Michael Dell and his wife Susan.
In May the couple gave more than $1bn to their foundation, which focuses on children’s issues and community initiatives.