8) Christy Walton – Net Worth: $41.7 billion
Christy Walton is the world’s richest woman. Walton is the widow of John Walton, one of the sons of Sam Walton, and after his death in June 2005 she inherited his fortune of $18.2 billion. Walton is no stranger to the richest people rankings, as she was listed as the sixth-richest person in the United States, and the tenth-richest person in the world in 2014.
Though the bulk of her money comes from her shares in Wal-Mart, her husband also invested in First Solar, which she is reaping money from.
=6) David Koch – Net Worth: $42.9 billion
Charles’s brother David also owns 42 per cent of the firm and is vice president at the company. He and Charles are well known as megadonors for their conservative and libertarian political agenda and to the arts and medicine, including Lincoln Center and Memorial Sloan-Kettering Cancer Center.