Oprah Winfrey, Taylor Swift and Sam Altman among record 590 U.S. billionaires too poor for Forbes 400 as Africa’s once-poorest billionaire nears $2 billion

The mark for entering the top tier of American wealth has recently hit a new peak, leaving behind even some of the world's most famous financial figures. Despite possessing multi-billion-dollar fortunes, a record 590 U.S. billionaires failed to secure a place on the latest Forbes 400 list.