Porvair (FRA:850) Cyclically Adjusted PB Ratio: (As of Aug. 04, 2026)

Author: Vera Yuan Vera Yuan
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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.
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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.

FRA:850 Porvair PLC FRA:850
93 GF Score
Price €9.55
GF Value €8.56
! 3 Warning Signs
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What is Porvair Cyclically Adjusted PB Ratio?

Note: If the price history is too short, we do not calculate current Cyclically Adjusted PB Ratio for this stock. All the historical data is shown as the company's primary share's data instead.

Shiller PE for Stocks: The True Measure of Stock Valuation


Porvair  (FRA:850) 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.


Porvair Cyclically Adjusted PB Ratio Related Terms


Porvair Cyclically Adjusted PB Ratio Historical Data

* Premium members only.

The historical data trend for Porvair'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.

Porvair Cyclically Adjusted PB Ratio Chart

Porvair Annual Data
Trend Nov16 Nov17 Nov18 Nov19 Nov20 Nov21 Nov22 Nov23 Nov24 Nov25
Cyclically Adjusted PB Ratio
Get a 7-Day Free Trial Premium Member Only Premium Member Only 3.89 2.61 2.50 2.52 2.82

Porvair Semi-Annual Data
Nov16 May17 Nov17 May18 Nov18 May19 Nov19 May20 Nov20 May21 Nov21 May22 Nov22 May23 Nov23 May24 Nov24 May25 Nov25 May26
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 0.00 2.52 0.00 2.82 0.00

FRA:850 vs VLTO, ZWS, CECO: Cyclically Adjusted PB Ratio Comparison

For the Pollution & Treatment Controls subindustry, Porvair'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.


Porvair Cyclically Adjusted PB Ratio vs Industrial Products Industry

For the Industrial Products industry and Industrials sector, Porvair's Cyclically Adjusted PB Ratio distribution charts can be found below:

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


FRA:850
93GF Score
Porvair PLC FRA:850
Cyclically Adjusted PB Ratio is just one metric. See GF Score™, valuation, warning signs, and more.
View Full Analysis

Porvair 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.

Porvair's Cyclically Adjusted Book per Share for the fiscal year that ended in Nov25 is calculated as:

For example, Porvair's adjusted Book Value per Share data for the fiscal year that ended in Nov25 was:

Adj_Book=Book Value per Share/CPI of Nov25 (Change)*Current CPI (Nov25)
=4.132/139.4000*139.4000
=4.132

Current CPI (Nov25) = 139.4000.

Porvair Annual Data

Book Value per Share CPI Adj_Book
201611 1.818 101.800 2.489
201711 1.846 104.700 2.458
201811 2.216 106.900 2.890
201911 2.415 108.500 3.103
202011 2.374 109.100 3.033
202111 2.796 114.100 3.416
202211 3.280 124.800 3.664
202311 3.519 130.000 3.773
202411 3.983 134.600 4.125
202511 4.132 139.400 4.132

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 Porvair (FRA:850) Overvalued in 2026?

Based on GuruFocus' analysis, Porvair stock appears to be overvalued. The current stock price of €9.55 is trading 11.6% above its estimated GF Value™ of €8.56.

Key valuation signals for FRA:850:

  • Cyclically Adjusted PB Ratio:
  • GF Value™: €8.56 vs. price of €9.55 (11.6% above fair value)
  • GF Score™: 93/100 with 3 warning signs

No single metric tells the full story. See the FRA:850 stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.


Porvair Business Description

Other Exchanges PVARF:USAPRVl:UKPRV:UK
Address 7 Regis Place, Bergen Way, King\'s Lynn, Norfolk, GBR, PE30 2JN
Porvair PLC is an environmental treatment control company. It develops filtration solutions to be used by various types of industries. The company caters to its clients through three divisions: Aerospace and Industrial, Laboratory, and Metal Melt Quality. The Aerospace and Industrial Division is a key revenue generator, principally serving the aviation, energy, and industrial markets. Laboratory Division principally serving the bioscience and environmental laboratory instrument and consumables market. Metal Melt Quality Division principally serves the world aluminium, North American Free Trade Agreement (NAFTA), iron foundry, and superalloys markets. The company generates the majority of its manufacturing revenue from sales in the United States.
93GF Score

Get the complete analysis for FRA:850

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

€9.55
Price
€8.56
GF Value