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Christy Walton

22,500,000,000 Dollars

(Net Worth: 22.5 Billion)
Christy Ruth Walton was the wife of late John T. Walton, one of the sons of Sam Walton who has founded the Wal-Mart Stores company in 1962- the biggest network of discount department stores in US and world's largest public corporation by revenue. After the death of her husband in 2005 Christy has inherited his fortune.