First place among the most generous US billionaires was taken by investor Warren Buffet. In 2017 he donated $2.8 billion, of which more than $2 billion went to the Bill Gates fund, and the rest - to charitable funds run by his three children.

Bill and Melinda Gates ranked second. They spent $2.5 billion on charity. The Gates Foundation is the largest charitable foundation in the world and in particular in the United States. Warren Buffet is one of the board members.

In the summer of 2010, Buffett and Gates launched the project “Giving Pledge”, each of the joined billionaires and millionaires promise to donate at least 50% of their fortune.

Former New York Mayor Michael Bloomberg spent $700 million to charity last year. Between 2000 and 2017, Bloomberg gave 10% of his fortune to charity $45 billion.

The charitable foundation of Walmart founder Sam Walton and his family was created in 1987. Last year, the Walton couple contributed $536 million to charity.

George Soros closes the top 5.  He donated $531 million to charity in 2017. The Open Society Foundation, created by him, initiates and supports programs in the field of education, culture and art. The fund is considered one of the largest in the world.

The sixth place among the most generous billionaires  is occupied by Mark Zuckerberg and his wife Priscilla Chan. They founded the Chan-Zuckerberg Initiative in 2015 which invests in education, health and research. In 2017, the family gave $531 million to charity.

Intel founder Gordon Moore and his wife Betty spent $338 million on charity. In particular, their foundation contributed $200 million to environmental projects.

Mathematician James Simons, who founded the Renaissance Technologies Corporation hedge fund, and his wife transferred $328 million to charity. Of these, $25 million was directed to support mathematics and science teachers in public schools.

The ninth place of the ranking belongs to Hansjörg Wyss. Last year, he spent $315 million on charity, most of which went to wildlife preservation.

American entrepreneur Dustin Moskovitz and his wife Kari Tuna close the top 10 of the most generous billionaires. In total, the sum spent on charity amounted to $298 million. They sent money to help poor households in Kenya and Uganda, as well as to the malaria prevention fund, and to a company that develops safe technologies in the field of artificial intelligence.