As the Dow Jones suffered its worst decline since 1987 and coronavirus fears caused markets to slide around the globe, the world’s twenty richest people lost just over $78 billion combined in a single day.

Jeff Bezos, the world’s richest person, saw his net worth drop by $8 billion, shedding more than 7% of his net worth as Amazon shares fell by nearly 8%. Close behind was Bernard Arnault, chairman and CEO of French luxury conglomerate LVMH, whose net worth declined by $7.7 billion. Arnault, the world’s third-richest person, finished the day with $82.5 billion, after shares in LVMH closed nearly 9% lower as the luxury retail industry was hit by the effect of the coronavirus on demand for luxury goods in China and Europe.

Facebook CEO Mark Zuckerberg lost $5.7 billion — 9% of his net worth — as Facebook shares plunged by more than 9%. Oracle founder Larry Ellison’s net worth fell by nearly as much, dropping by $5.6 billion as Oracle shares slumped 11%.