Mark Zuckerberg lost $29 billion of his net worth in a day after Meta Platforms Inc shares posted a record one-day drop, while fellow billionaire Jeff Bezos made $20 billion after Amazon's record earnings.

Meta's shares fell 26%, wiping out more than $200 billion in the largest single-day market value reset for an American company. This reduced founder and CEO Zuckerberg's net worth to $85 billion, according to Forbes.

Zuckerberg owns about 12.8% of the tech giant formerly known as Facebook.

Bezos, founder and chairman of e-commerce retailer Amazon, owns about 9.9% of the company, according to Refinitiv. He is also the third richest person in the world according to Forbes.

According to Forbes, Bezos' net worth rose 57% to $177 billion in 2021 from a year earlier, largely due to Amazon's boom during the pandemic, when people were heavily dependent on online shopping.

Zuckerberg's one-day decline in wealth is one of the largest ever and comes after Tesla Inc boss Elon Musk's one-day $35 billion loss in November. Musk, the world's richest man, then polled Twitter users whether he should sell 10% of his stake in the electric car maker. Tesla shares are still reeling from the sell-off.