After rising 132% year-to-date, it plunged 26% on earnings day: Why couldn't Fortinet's (FTNT.US) "good results" a good stock price?

Zhitong Finance APP has learned that U.S. cybersecurity giant Fortinet (FTNT.US) recently released its financial results for the third quarter of 2026. Driven by a broad recovery in product demand and strong performance from its AI security business, several of the company's core metrics significantly exceeded market expectations, and it raised its full-year billings guidance for the third time this year. However, due to stretched valuations, slowing revenue growth, and weaker-than-expected performance in its services segment, the stock plunged 26% in after-hours trading.