Fortinet stock fell sharply on October 29, 2026. Revenue forecasts were bleak, and product growth slowed. Service revenue growth hit 13%, the weakest in several years. This led to a big two-day drop in the stock price. Yahoo Finance all reported the decline. BofA Securities downgraded Fortinet, adding to concerns. The stock's drop shows tough times in the software sector. Other companies like ServiceNow are also experiencing challenges.