85. Christy Walton
Walton’s net worth is up slightly in the past year along with shares of Wal-mart, the retailing behemoth founded by her husband John’s father, Sam. Christy inherited her stake after John, a onetime Green Beret, died in 2005 in a plane crash. He gave half his stake to charitable trusts; the rest went to Christy, who got one sixth, and their son Lukas (No. 33) got one third.