7. Pierre Omidyar (Founder and Chairman of eBay)

Estimated worth: $5.2 billion 

Estimated donations: $800 million

Charity: Omidyar Network

Omidyar and his wife Pam are well-known philanthropists who founded Omidyar Network in 2004 in order to expand their efforts beyond non-profits to include for-profits and public policy.

It is a philanthropic investment firm which is dedicated to harness the power of markets to create opportunity for people to improve their lives. Established in 2004, by Omidyar and his wife Pam, the organization invests in and helps to scale innovative organizations to catalyze economic, social, and political change. Until now, Omidyar Network has donated more than $270 million to for-profit companies and nonprofit organizations that foster economic advancement and encourage individual participation across multiple investment areas, including microfinance, property rights, government transparency, and social media.

He has financed companies that provide financial assistance to low-income families. He even conducted a political-satire show in Kenya. He has pledged to donate $400 million to non-profit organizations that promote government transparency and suffrage.