Fortinet (MIL:1FTNT) Cyclically Adjusted PB Ratio: (As of Sep. 22, 2026)

Author: Vera Yuan Vera Yuan
Vera Yuan
Vera Yuan
Director of Data and Quant Analytics at GuruFocus
Focused on building reliable datasets, financial models, and research tools for value-minded investors. Committed to turning complex data into practical guidance for value-investing and long-term wealth.
Reviewed by: Charlie Tian Charlie Tian
Charlie Tian
Charlie Tian
Founder & CEO of GuruFocus
Dr. Charlie Tian is the founder and CEO of GuruFocus.com, a leading global investment research platform established in 2004. With a Ph.D. in physics, Dr. Tian transitioned from science to finance, applying a data-driven, disciplined approach to value investing.

MIL:1FTNT Fortinet Inc MIL:1FTNT
72 GF Score
Price €151.54
GF Value €92.75
Valuation Significantly Overvalued
! 4 Warning Signs
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What is Fortinet Cyclically Adjusted PB Ratio?

Shiller PE for Stocks: The True Measure of Stock Valuation


Fortinet  (MIL:1FTNT) Cyclically Adjusted PB Ratio Explanation

Compared with the regular PB Ratio, which works poorly for cyclical businesses, the Cyclically Adjusted PB Ratio smoothed out the fluctuations of book value during business cycles. Therefore it is more accurate in reflecting the valuation of the company.

If a company has consistent business performance, the Cyclically Adjusted PB Ratio should give similar results to regular PB Ratio.


Fortinet Cyclically Adjusted PB Ratio Related Terms


Fortinet Cyclically Adjusted PB Ratio Historical Data

* Premium members only.

The historical data trend for Fortinet's Cyclically Adjusted PB Ratio can be seen below:

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

Fortinet Cyclically Adjusted PB Ratio Chart

Fortinet Annual Data
Trend Dec16 Dec17 Dec18 Dec19 Dec20 Dec21 Dec22 Dec23 Dec24 Dec25
Cyclically Adjusted PB Ratio
Get a 7-Day Free Trial Premium Member Only Premium Member Only - - - - 71.67

Fortinet Quarterly Data
Sep21 Dec21 Mar22 Jun22 Sep22 Dec22 Mar23 Jun23 Sep23 Dec23 Mar24 Jun24 Sep24 Dec24 Mar25 Jun25 Sep25 Dec25 Mar26 Jun26
Cyclically Adjusted PB Ratio Get a 7-Day Free Trial Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only 98.43 79.23 74.88 74.44 137.85

MIL:1FTNT vs NET, SNPS, XYZ: Cyclically Adjusted PB Ratio Comparison

For the Software - Infrastructure subindustry, Fortinet's Cyclically Adjusted PB Ratio, along with its competitors' market caps and Cyclically Adjusted PB Ratio data, can be viewed below:

* Competitive companies are chosen from companies within the same industry, with headquarter located in same country, with closest market capitalization; x-axis shows the market cap, and y-axis shows the term value; the bigger the dot, the larger the market cap. Note that "N/A" values will not show up in the chart.


Fortinet Cyclically Adjusted PB Ratio vs Software Industry

For the Software industry and Technology sector, Fortinet's Cyclically Adjusted PB Ratio distribution charts can be found below:

* The bar in red indicates where Fortinet's Cyclically Adjusted PB Ratio falls into.


MIL:1FTNT
72GF Score
Fortinet Inc MIL:1FTNT
Cyclically Adjusted PB Ratio is just one metric. See GF Score™, valuation, warning signs, and more.
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Fortinet Cyclically Adjusted PB Ratio Calculation

Like the Shiller PE Ratio, the Cyclically Adjusted PB Ratio takes the Book Value per Share from the past 10 years, adjusts it for inflation, and then calculates the average. This average is then used for the P/B calculation. Because it considers this 10-year average, it's often referred to as the CAPB Ratio.

The Shiller PE Ratio was first used by professor Robert Shiller to measure the valuation of the overall market. The similar calculation is applied by GuruFocus to calculate the Cyclically Adjusted PB Ratio.

Fortinet's Cyclically Adjusted Book per Share for the quarter that ended in Jun. 2026 is calculated as:

For example, Fortinet's adjusted Book Value per Share data for the three months ended in Jun. 2026 was:

Adj_Book=Book Value per Share/CPI of Jun. 2026 (Change)*Current CPI (Jun. 2026)
=1.849/333.9520*333.9520
=1.849

Current CPI (Jun. 2026) = 333.9520.

Fortinet Quarterly Data

Book Value per Share CPI Adj_Book
201609 0.844 241.428 1.167
201612 0.918 241.432 1.270
201703 0.957 243.801 1.311
201706 0.920 244.955 1.254
201709 0.874 246.819 1.183
201712 0.585 246.524 0.792
201803 0.671 249.554 0.898
201806 0.791 251.989 1.048
201809 0.902 252.439 1.193
201812 1.041 251.233 1.384
201903 1.104 254.202 1.450
201906 1.153 256.143 1.503
201909 1.286 256.759 1.673
201912 1.393 256.974 1.810
202003 0.601 258.115 0.778
202006 0.599 257.797 0.776
202009 0.749 260.280 0.961
202012 0.861 260.474 1.104
202103 1.022 264.877 1.289
202106 1.085 271.696 1.334
202109 1.199 274.310 1.460
202112 0.867 278.802 1.039
202203 0.261 287.504 0.303
202206 -0.461 296.311 -0.520
202209 -0.815 296.808 -0.917
202212 -0.338 296.797 -0.380
202303 0.013 301.836 0.014
202306 0.375 305.109 0.410
202309 0.090 307.789 0.098
202312 -0.551 306.746 -0.600
202403 -0.167 312.332 -0.179
202406 0.352 314.175 0.374
202409 1.063 315.301 1.126
202412 1.881 315.605 1.990
202503 2.362 319.799 2.467
202506 2.293 322.561 2.374
202509 0.842 324.800 0.866
202512 1.418 324.054 1.461
202603 1.170 330.213 1.183
202606 1.849 333.952 1.849

Add all the adjusted book value per share together and divide the count will get our Cyclically Adjusted Book per Share.

Please note that we use the CPI data of the country/region where the company is headquartered. If the CPI data for that country/region is not available, then we will use the CPI data of the United States as default.

Is Fortinet (MIL:1FTNT) Overvalued in 2026?

Based on GuruFocus' analysis, Fortinet stock appears to be overvalued. The current stock price of €151.54 is trading 63.4% above its estimated GF Value™ of €92.75. GuruFocus considers Fortinet to be Significantly Overvalued.

Key valuation signals for MIL:1FTNT:

  • Cyclically Adjusted PB Ratio:
  • GF Value™: €92.75 vs. price of €151.54 (63.4% above fair value)
  • GF Score™: 72/100 with 4 warning signs

No single metric tells the full story. See the MIL:1FTNT stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.


Fortinet Business Description

Address 909 Kifer Road, Sunnyvale, CA, USA, 94086
Fortinet is a platform-based cybersecurity vendor with product offerings covering network security, cloud security, zero-trust access, and security operations. The firm derives a majority of its revenue through sales of its subscriptions and support-based business. The California-based firm has more than 800,000 customers across the world.
72GF Score

Get the complete analysis for MIL:1FTNT

Cyclically Adjusted PB Ratio is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.

€151.54
Price
€92.75
GF Value