Facebook’s stock is set for its worst day ever by. Shares fell a staggering 19% at the opening bell on Thursday. Facebook warned investors on Wednesday that sales growth would slow in the coming quarters as the company adjusts its strategy to focus on privacy.
The drop wiped out nearly $120 billion in market value, one of the biggest losses ever for a public company.
CEO Mark Zuckerberg’s net worth plummeted more than $11 billion, according to Forbes, which tracks billionaires’ portfolios.
Facebook says it will spend a lot of money to accomplish its goals. The company plans to invest billions of dollars per year improving safety and security after a bruising period of headlines about Facebook’s role in enabling fake news and election meddling.
The company’s previous worst single-day performance was July 27, 2012, when the stock fell 11.7%. The stock tanked that day after the company failed to convince investors that it could sell mobile advertising. Mobile now makes up 91% of the company’s advertising revenue.