Gentex (STU:GTX) Cyclically Adjusted Book per Share: €8.67 (As of Mar. 2026)


STU:GTX Gentex Corp STU:GTX
89 GF Score
Price €21.19
GF Value €31.17
Valuation Significantly Undervalued
! 3 Warning Signs
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What is Gentex Cyclically Adjusted Book per Share?

Gentex STU:GTX +1.48% 89 Cyclically Adjusted Book per Share is €8.67 as of Mar. 2026. GuruFocus rates STU:GTX with a GF Score™ of 89/100 and a GF Value™ of €31.17 (Significantly Undervalued). The stock has 3 warning signs investors should review.

E10 is a concept invented by Prof. Robert Shiller, who uses E10 for his Shiller PE Ratio calculation. E10 is the average of the inflation adjusted earnings of a company over the past 10 years. The similar calculation is applied by GuruFocus to calculate the Cyclically Adjusted Book per Share and the Cyclically Adjusted PB Ratio. The Cyclically Adjusted Book per Share is the average of the inflation adjusted Book Value per Share of a company over the past 10 years.

Gentex's adjusted book value per share for the three months ended in Mar. 2026 was €10.164. Add all the adjusted book value per share for the past 10 years together and divide the count will get our Cyclically Adjusted Book per Share, which is €8.67 for the trailing ten years ended in Mar. 2026.

During the past 12 months, Gentex's average Cyclically Adjusted Book Growth Rate was 6.90% per year. During the past 3 years, the average Cyclically Adjusted Book Growth Rate was 7.40% per year. During the past 5 years, the average Cyclically Adjusted Book Growth Rate was 9.40% per year. During the past 10 years, the average Cyclically Adjusted Book Growth Rate was 10.40% per year. Please click Growth Rate Calculation Example (GuruFocus) to see how GuruFocus calculates Wal-Mart Stores Inc (WMT)'s revenue growth rate. You can apply the same method to get the Cyclically Adjusted Book Growth Rate using Cyclically Adjusted Book per Share data.

During the past 13 years, the highest 3-Year average Cyclically Adjusted Book Growth Rate of Gentex was 29.30% per year. The lowest was 7.00% per year. And the median was 11.10% per year.

As of today (2026-07-13), Gentex's current stock price is €21.19. Gentex's Cyclically Adjusted Book per Share for the quarter that ended in Mar. 2026 was €8.67. Gentex's Cyclically Adjusted PB Ratio of today is 2.44.

During the past 13 years, the highest Cyclically Adjusted PB Ratio of Gentex was 5.97. The lowest was 2.12. And the median was 4.17.


Gentex  (STU:GTX) Cyclically Adjusted Book per Share Explanation

If a company grows much fast than inflation, Cyclically Adjusted Book per Share may underestimate the company's equity. Cyclically Adjusted PB Ratio can seem to be too high even the actual PB Ratio is low.

For the Cyclically Adjusted PB Ratio, the book value of the past 10 years are inflation-adjusted and averaged. The result is used for P/B calculation. Since it looks at the average over the last 10 years, the Cyclically Adjusted PB Ratio is also called CAPB Ratio.

The Shiller PE Ratio was first used by professor Robert Shiller. He uses E10 for his Shiller PE Ratio calculation. E10 is the average of the inflation adjusted earnings per share of a company over the past 10 years. The similar calculation is applied by GuruFocus to calculate the Cyclically Adjusted PB Ratio. The Cyclically Adjusted Book per Share is the average of the inflation adjusted book value per share of a company over the past 10 years.

Gentex's Cyclically Adjusted PB Ratio of today is calculated as

Cyclically Adjusted PB Ratio=Share Price/Cyclically Adjusted Book per Share
=21.19/8.67
=2.44

* 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.

During the past 13 years, the highest Cyclically Adjusted PB Ratio of Gentex was 5.97. The lowest was 2.12. And the median was 4.17.


Be Aware

Cyclically Adjusted PB Ratio works better for cyclical companies. It gives you a better idea on the company's real book value.


Gentex Cyclically Adjusted Book per Share Related Terms


Gentex Cyclically Adjusted Book per Share Historical Data

* Premium members only.

The historical data trend for Gentex's Cyclically Adjusted Book per Share 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.

Gentex Cyclically Adjusted Book per Share Chart

Gentex Annual Data
Trend Dec16 Dec17 Dec18 Dec19 Dec20 Dec21 Dec22 Dec23 Dec24 Dec25
Cyclically Adjusted Book per Share
Get a 7-Day Free Trial Premium Member Only Premium Member Only 6.19 7.38 7.72 8.92 8.25

Gentex Quarterly Data
Jun21 Sep21 Dec21 Mar22 Jun22 Sep22 Dec22 Mar23 Jun23 Sep23 Dec23 Mar24 Jun24 Sep24 Dec24 Mar25 Jun25 Sep25 Dec25 Mar26
Cyclically Adjusted Book per Share 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 8.69 8.10 8.22 8.25 8.67

STU:GTX vs QS, ATMU, GTX: Cyclically Adjusted Book per Share Comparison

For the Auto Parts subindustry, Gentex'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.


Gentex Cyclically Adjusted PB Ratio vs Vehicles & Parts Industry

For the Vehicles & Parts industry and Consumer Cyclical sector, Gentex's Cyclically Adjusted PB Ratio distribution charts can be found below:

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


STU:GTX
89GF Score
Gentex Corp STU:GTX
Cyclically Adjusted Book per Share is just one metric. See GF Score™, valuation, warning signs, and more.
View Full Analysis

Gentex Cyclically Adjusted Book per Share Calculation

E10 is a concept invented by Prof. Robert Shiller, who uses E10 for his Shiller PE Ratio calculation. E10 is the average of the inflation adjusted earnings of a company over the past 10 years. The similar calculation is applied by GuruFocus to calculate the Cyclically Adjusted Book per Share and the Cyclically Adjusted PB Ratio. The Cyclically Adjusted Book per Share is the average of the inflation adjusted Book Value per Share of a company over the past 10 years.

What is Cyclically Adjusted Book per Share? How do we calculate Cyclically Adjusted Book per Share?

Cyclically Adjusted Book per Share is the average of the inflation adjusted Book Value per Share of a company over the past 10 years. Let's use an example to explain.

If we want to calculate the Cyclically Adjusted Book per Share of Wal-Mart (WMT) for Dec. 31, 2010, we need to have the inflation data and the book value per share from 2001 through 2010.

We adjusted the 2001 book value per share data with the total inflation from 2001 through 2010 to the equivalent book value in 2010. If the total inflation from 2001 to 2010 is 40%, and Wal-Mart's book value is $1 a share in 2001, then the 2001's equivalent book value in 2010 is $1.4 a share. If Wal-Mart's book value is $1 again in 2002, and the total inflation from 2002 through 2010 is 35%, then the equivalent 2002 book value in 2010 is $1.35. So on and so forth, you get the equivalent book value per share of past 10 years. Then you add them together and divided the sum by the count to get 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.

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

Adj_Book= Book Value per Share /CPI of Mar. 2026 (Change)*Current CPI (Mar. 2026)
=10.164/330.2130*330.2130
=10.164

Current CPI (Mar. 2026) = 330.2130.

Gentex Quarterly Data

Book Value per Share CPI Adj_Book
201606 5.539 241.018 7.589
201609 5.773 241.428 7.896
201612 6.294 241.432 8.608
201703 6.425 243.801 8.702
201706 6.246 244.955 8.420
201709 5.988 246.819 8.011
201712 6.179 246.524 8.277
201803 5.839 249.554 7.726
201806 6.116 251.989 8.015
201809 6.026 252.439 7.883
201812 6.310 251.233 8.294
201903 6.430 254.202 8.353
201906 6.615 256.143 8.528
201909 6.896 256.759 8.869
201912 6.942 256.974 8.921
202003 6.781 258.115 8.675
202006 6.585 257.797 8.435
202009 6.567 260.280 8.331
202012 6.625 260.474 8.399
202103 6.820 264.877 8.502
202106 6.656 271.696 8.090
202109 6.783 274.310 8.165
202112 7.254 278.802 8.592
202203 7.470 287.504 8.580
202206 7.993 296.311 8.908
202209 8.757 296.808 9.743
202212 8.328 296.797 9.266
202303 8.485 301.836 9.283
202306 8.683 305.109 9.397
202309 9.112 307.789 9.776
202312 9.162 306.746 9.863
202403 9.451 312.332 9.992
202406 9.685 314.175 10.179
202409 9.577 315.301 10.030
202412 10.373 315.605 10.853
202503 10.183 319.799 10.515
202506 9.597 322.561 9.825
202509 9.710 324.800 9.872
202512 9.861 324.054 10.048
202603 10.164 330.213 10.164

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

What does a Cyclically Adjusted Book per Share of €8.67 mean?
Gentex (STU:GTX) has a Cyclically Adjusted Book per Share of €8.67 as of Mar. 2026. Cyclically adjusted book value per share represents the company's inflation-adjusted book value per share over a 10-year period. View historical data on Gentex and its competitors.
Is Gentex's Cyclically Adjusted Book per Share too high?
Gentex's current Cyclically Adjusted Book per Share is €8.67. Overall, Gentex has a GF Score™ of 89/100 and is considered Significantly Undervalued, reflecting its overall financial health beyond just this single metric.
How does Gentex's Cyclically Adjusted Book per Share compare to QS and ATMU?
Gentex's Cyclically Adjusted Book per Share of €8.67 can be compared against companies in the Vehicles & Parts industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Cyclically Adjusted Book per Share for a Vehicles & Parts company?
A good Cyclically Adjusted Book per Share depends on the Vehicles & Parts industry context. However, Cyclically Adjusted Book per Share should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Cyclically Adjusted Book per Share mean?
A high Cyclically Adjusted Book per Share can signal that a stock is expensive relative to its fundamentals. Cyclically adjusted book value per share represents the company's inflation-adjusted book value per share over a 10-year period. View historical data on Gentex and its competitors. Gentex's current Cyclically Adjusted Book per Share is €8.67. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Gentex stock overvalued right now?
Based on GuruFocus' analysis, Gentex (STU:GTX) is currently considered Significantly Undervalued. The stock's GF Value™ is €31.17, compared to a current price of €21.19 — trading 32% below its estimated fair value. The current Cyclically Adjusted Book per Share is €8.67. Gentex's overall GF Score™ is 89/100 with 3 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Cyclically Adjusted Book per Share calculated?
Cyclically Adjusted Book per Share is calculated from a company's financial statements. For Gentex (STU:GTX), the current Cyclically Adjusted Book per Share is €8.67 as of Mar. 2026. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.

Is Gentex (STU:GTX) Overvalued in 2026?

Based on GuruFocus' analysis, Gentex stock appears to be undervalued. The current stock price of €21.19 is trading 32% below its estimated GF Value™ of €31.17. GuruFocus considers Gentex to be Significantly Undervalued.

Key valuation signals for STU:GTX:

  • Cyclically Adjusted Book per Share: €8.67
  • GF Value™: €31.17 vs. price of €21.19 (32% below fair value)
  • GF Score™: 89/100 with 3 warning signs

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


Gentex Business Description

Other Exchanges GNTX:USA
Address 600 North Centennial Street, Zeeland, MI, USA, 49464
Gentex was founded in 1974 to produce smoke-detection equipment. The company sold its first glare-control interior mirror in 1982 and its first model using electrochromic technology in 1987. Automotive revenue was about 89% of total revenue in 2025, down from 98% in 2024 due to the Voxx acquisition in April 2025. The company is constantly developing new applications for the technology to remain on top. Sales in 2025 totaled about $2.5 billion with 44.8 million mirrors shipped. The unit mix breaks out as 64% interior and 36% exterior versus 31% exterior in 2019. The company is based in Zeeland, Michigan.
89GF Score

Get the complete analysis for STU:GTX

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

€21.19
Price
€31.17
GF Value