Susan Alice Buffett, $3 billion
Susan Alice Buffett is the daughter of investment tycoon Warren Buffett, who owns the investment company, Berkshire Hathaway. She made her money through ownership of shares in Buffett's firm. She is also a philanthropist and operator of the Sherwood Foundation, which provides grants to children in low-income households.
Whitney Kroenke Burditt, $2.6 billion
Burditt's grandfather is one of Walmart's founding partners. She is the daughter of Ann Walton and Stan Kroenke and attended Northwestern University. She is currently a film producer who lives in Hollywood.