Steve Ballmer, Microsoft
Net worth: $41.2 billion Foundation: Ballmer Group Established: 2014
The high-wattage former CEO of
Microsoft, who led the company from 2000 to 2014, has ramped up his philanthropy since 2014. Ballmer has put over $2 billion into a
donor-advised fund, with a focus on lifting Americans out of poverty. He and his wife run the Ballmer Group, a charity that aims to improve economic mobility for children and families in the U.S. His estimated lifetime giving is worth $121 million.