Christy Walton, 56
$26.5 billion
Wal-Mart, U.S.
The widow of John Walton inherited her wealth after he died in an airplane accident in 2005. Repeating her 2010 title as world’s richest woman, she got an extra bump in her fortune because of her late husband’s early investment in First Solar; shares up nearly 500% since 2006 initial public offering. But the bulk still comes from her holdings in Wal-Mart, the retailer founded by her father-in-law Sam Walton and his brother James in 1962. The philanthropist supports museums, education and organic gardening.
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