Fastly, Inc. (FSLY) stock experienced a significant intraday plummet of 36.36% during Thursday's trading session.

The sharp decline followed the company's release of its first-quarter financial results. While Fastly reported adjusted earnings of 13 cents per share, beating Wall Street expectations, and revenue of $173.02 million that also exceeded forecasts, investors focused on a key shortfall. Revenue from the company's security segment, which captures the bulk of its AI-related traffic, came in at $34.9 million, missing some analyst estimates of $36.9 million.

The market reaction is characterized as a classic "sell-the-news" event. Fastly's stock had rallied approximately 210% year-to-date ahead of the report, with volatile gains in the preceding days as investors positioned for strong results. With these elevated expectations already priced in, the specific disappointment in AI-driven security revenue prompted widespread profit-taking, leading to the severe price correction.