Of the 286 female billionaires identified , only 17 % have self-made fortunes . Nearly a quarter of world 's billionaires are women , with combined wealth of $ 930 billion . Comment: Topping the list in North America -- and globally -- is Christy Walton worth $ 37.9 billion .
Nearly a quarter of world 's billionaires are women , with combined wealth of $ 930 billion . Comment: Topping the list in North America -- and globally -- is Christy Walton worth $ 37.9 billion .