The 100 wealthiest Americans got more than $1.5 trillion richer over the last four years, with tech tycoons including Elon Musk, Larry Ellison and Mark Zuckerberg leading the way, according to the Bloomberg Billionaires Index.

Tech industry leads the list of the top billionaires in the US, far outpacing the richest athletes and famous celebrities. See who made the list.

President Joe Biden in his Wednesday farewell speech to the nation warned that American democracy was sliding into an “oligarchy” of tech billionaires