Fastly, Inc. (FSLY) experienced a significant decline of 24.61% in the post-market session on Wednesday. The sharp drop followed the release of the company's latest quarterly earnings report.

Despite reporting first-quarter results that exceeded analyst estimates—with adjusted earnings per share of $0.13 to $0.15 against expectations of $0.08 to $0.09, and revenue of approximately $173 million versus estimates around $170 million—the stock sold off sharply. Market analysis indicates that the actual performance, particularly in the security segment which captures AI-related traffic, fell short of the heightened expectations that had been priced into the stock after a substantial pre-earnings rally.

The company's stock had gained approximately 210% year-to-date and experienced volatile trading in the days leading up to the report as investors positioned for the results. The security revenue, a key growth area, came in at $34.9 million, missing some analyst forecasts of $36.9 million. This specific disappointment, coupled with a "sell the news" dynamic after the significant run-up, triggered the after-hours plunge.