There aren’t many women billionaires, but the 10 richest are worth $401 billion. The majority of ultra-rich women—226 of 327 as identifed by Forbes— inherited their wealth, including the world’s three richest women: L'Oréal heiress Francoise Bettencourt Meyers, Walmart heiress Alice Walton and Julia Klinea Koch, who inherited a stake in Koch Industries when her husband, David Koch, died in 2019.