From the Vancouver Sun:
Topping the list is Christy Walton, who is worth US$20-billion. Walton is the widow of Wal-Mart scion John Walton, who died in a plane crash in 2005. Right behind her is Alice Walton, worth US$19.5-billion.
This year the 20 richest women on the planet have a combined net worth of US$160-billion derived from a diverse string of industries including manufacturing, finance, real estate and commodities.
While nearly all of their personal balance sheets took a hit in the past 12 months, most of the world's richest women have rehabbed their riches since the global equity markets bottomed out. Since we published our list of the World's Billionaires in March, this elite group has added US$20-billion in cumulative wealth.