Based on the latest data from August 2025, Cisco (CSCO) is trading at $69.09, positioning the stock above the 27.3x PE multiple boundary of $71.75. This places CSCO in the "Warning" zone, indicating severe overvaluation according to the PE stream analysis. The stock is trading significantly above all lower PE boundaries: 24.3x ($63.94), 21.4x ($56.16), 18.4x ($48.35), 15.4x ($40.57), and 12.5x ($32.79), suggesting the stock has reached historically expensive valuation levels relative to its earnings. Analyzing the historical trend reveals a dramatic valuation expansion story for Cisco over the past five years. From 2020 to early 2022, the stock primarily traded within the "Fair" to "Watch" zones, oscillating between the 15.4x and 21.4x PE boundaries with prices ranging from $32-53. A significant shift occurred in late 2022 when CSCO began trading below the 12.5x PE boundary, entering "Undervalued" territory around $38-44 through most of 2023 and early 2024. However, starting in late 2024, the stock experienced substantial valuation expansion, breaking through multiple PE boundaries sequentially. By November 2024, CSCO had moved from "Undervalued" to "Overvalued" zones, and by August 2025, it reached the "Warning" zone above 27.3x PE. This represents a remarkable valuation journey from severe undervaluation to severe overvaluation within approximately 12 months, with the current price of $69.09 representing more than a 60% premium above the historical "Fair" valuation range.