39. SARA BLAKELY

$750 million  SOURCE: Spanx AGE: 50 • RESIDENCE: Atlanta SELF-MADE SCORE:  Her Spanx pioneered the shapewear market but now faces fierce competition from upstarts like No. 24 Kim Kardashian West’s Skims. The pandemic, which led to the cancellation of formal events around the world, dealt another blow to the business. Once the world’s youngest self-made female billionaire, Blakely is reportedly exploring a potential sale of her Atlanta-based firm.