After rising 132% this year, Fortinet (FTNT.US) plunged 26% on earnings day: Why can’t good performance bring a good stock price?

According to Jinse Finance APP, U.S. cybersecurity giant Fortinet (FTNT.US) recently released its Q3 2026 financial report. Driven by a comprehensive recovery in product demand and robust performance in its AI security business, several core company indicators significantly exceeded market expectations, and the company raised its full-year billing guidance for the third time this year. However, due to valuation overshoot, a slowdown in revenue growth, and the service segment underperforming expectations, the stock price plunged 26% after hours.