Based on the latest data from August 2025, Fortinet (FTNT) is currently trading at $78.77, positioning the stock in the undervalued zone below the 31.1x PE multiple boundary of $78.77. The stock is trading right at the threshold between severe undervaluation and the value investment zone, with the next PE boundary at 44.7x corresponding to $113.14. This represents a significant compression from earlier periods, as the stock has moved from trading in higher PE multiples back down to historically attractive valuation levels. Analyzing the historical trend, Fortinet experienced substantial valuation expansion from 2020 through 2024. The stock began 2020 trading well below fair value around $23, then embarked on a dramatic revaluation journey that peaked in early 2025 when it reached $108.52 in February, trading in the overvalued zone above the 44.7x PE multiple. The most significant valuation expansion occurred during 2021-2022, when the stock moved from the undervalued zone into fair and overvalued territories, with prices climbing from the $20s to the $60s-$90s range. However, the recent decline to $78.77 represents a notable valuation contraction, bringing the stock back to levels not seen since late 2024, suggesting either earnings growth has outpaced price appreciation or the market has reassessed the company's premium valuation, creating a potential value opportunity for investors.