NEW YORK – Facebook founder Mark Zuckerberg lost a huge $3 billion in a single day, an amount termed record breaking by economic observers.

The CEO of the social media giant suffered the prodigious financial hit in the value of Facebook stock on Thursday, one of the largest single-day losses ever for an individual investor.

According to CNN, Facebook shares plunged 5.5% after the chief financial officer warned investors that the company expects revenue growth from advertising to “come down meaningfully.” Zuckerberg holds 418 million shares of Facebook stock worth almost $50.2 billion.

Bloomberg estimates Zuckerberg’s total net worth at $52.2 billion, ranking him as the fifth-richest man in the world, just behind Warren Buffett and despite Thursday’s plunge, Facebook shares are up nearly 15% for the year, lifting Zuckerberg’s net worth by $6.4 billion.