The United States is home to roughly 40% of the world's billionaires. About 10% of America's richest citizens have committed to participate in the Giving Pledge and donate at least 50% of their wealth to charity during their lifetime or at death. Most notably, Warren Buffet—ranked the second richest American—has pledged 99% of his fortune to the Bill and Melinda Gates Foundation. The pledge is not a binding contract and each person can choose how to distribute his or her wealth. To learn more about the Giving Pledge, visit givingpledge.org.
- Paul G. Allen
- Laura and John Arnold
- Nicolas Berggruen
- Michael R. Bloomberg
- Eli and Edythe Broad
- Warren Buffett
- Jean and Steve Case
- Michele Chan and Patrick Soon-Shiong
- Lee and Toby Cooperman
- Barry Diller and Diane von Furstenberg
- Ann and John Doerr
- Larry Ellison
- Ted Forstmann
- Bill and Melinda Gates
- David and Barbara Green
- Jeff Greene
| - Lyda Hill
- Barron Hilton
- Jon and Karen Huntsman
- Carl Icahn
- Joan and Irwin Jacobs
- George B. Kaiser
- Sidney Kimmel
- Elaine and Ken Langone
- Gerry and Marguerite Lenfest
- Lorry I. Lokey
- George Lucas
- Duncan and Nancy MacMillan
- Alfred E. Mann
| - Joe and Rika Mansueto
- Bernie and Billi Marcus
- Michael and Lori Milken
- George P. Mitchell
- Thomas S. Monaghan
- Tashia and John Morgridge
- Dustin Moskovitz
- Pierre and Pam Omidyar
- Bernard and Barbro Osher
- Ronald O. Perelman
- Peter G. Peterson
- T. Boone Pickens
| - Julian H. Robertson, Jr.
- David Rockefeller
- David M. Rubenstein
- Herb and Marion Sandler
- Vicki and Roger Sant
- Walter Scott, Jr.
- Tom and Cindy Secunda
- Jim and Marilyn Simons
- Jeff Skoll
- Tom Steyer and Kat Taylor
- Jim and Virginia Stowers
- Ted Turner
- Sanford and Joan Weill
- Shelby White
- Charles Zegar and Merryl Snow Zegar
- Mark Zuckerberg
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