show chapters Facebook shares plunge: Heres how Wall Street is reacting 3 Hours Ago | 01:18 Facebook on Thursday posted the largest one-day loss in market value by any company in U.S. stock market history after releasing a disastrous quarterly report. The social media giants market capitalization plummeted by $119 billion to $510 billion as its stock price plummeted by 19 percent. At Wednesdays close, Facebooks market cap had totaled nearly $630 billion, according to FactSet. No company in the history of the U.S. stock market has ever lost $100 billion in market value in just one day, but two came close. On Sept. 22, 2000, Intel shed $90.74 billion in market value as the dot-com bubble burst. Earlier that year, Microsoft lost $80 billion from its market cap in one day. Other companies that have experienced similar one-day losses in dollar amount include Apple in 2013, when it lost $59.6 billion, and Exxon Mobil in 2008, when it lost $52.5 billion. Facebooks enormous loss in value came a day after the company reported weaker-than-expected revenue for the second quarter as well as disappointing global daily active users, a key metric for Facebook. The company also said it expects its revenue growth rate to slow in the second half of this year . Several analysts downgraded Facebooks stock, including Nomura Instinets Mark Kelley. With stagnating core user growth, we think there is too much near- to mid-term uncertainty to recommend shares at this point, Kelley, who downgraded the stock to neutral from buy, said in a note. The percentage decline was also the worst in Facebooks history. CNBCs Kate Rooney and Lucas Lloyd contributed to this report.

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