E10 is a concept invented by Prof. Robert Shiller, who uses E10 for his Shiller P/E calculation. E10 is the average of the inflation adjusted earnings of a company over the past 10 years.
Porvair's adjusted earnings per share data for the fiscal year that ended in Nov. 2025 was £0.393. Add all the adjusted EPS for the past 10 years together and divide 10 will get our e10, which is £0.31 for the trailing ten years ended in Nov. 2025.
During the past 12 months, Porvair's average E10 Growth Rate was 10.70% per year.
During the past 3 years, the average E10 Growth Rate was 10.50% per year.
During the past 5 years, the average E10 Growth Rate was 13.00% per year.
During the past 10 years, the average E10 Growth Rate was 13.50% 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 E10 growth rate using E10 data.
During the past 13 years, the highest 3-Year average E10 Growth Rate of Porvair was 18.60% per year. The lowest was -44.20% per year. And the median was 8.20% per year.
As of today (2026-06-26), Porvair's current stock price is £ 8.16. Porvair's E10 for the fiscal year that ended in Nov. 2025 was £0.31. Porvair's Shiller PE Ratio of today is 26.32.
During the past 13 years, the highestShiller PE Ratio of Porvair was 60.50. The lowest was 22.45. And the median was 33.03.
Porvair (LSE:PRV) E10 Explanation
If a company grows much fast than inflation, E10 may underestimate the company's earnings power. Shiller PE Ratio can seem to be too high even the actual P/E is low.
For the Shiller P/E, the earnings of the past 10 years are inflation-adjusted and averaged. The result is used for P/E calculation. Since it looks at the average over the last 10 years, the Shiller P/E is also called PE10.
The Shiller P/E was first used by professor Robert Shiller to measure the valuation of the overall market. The same calculation is applied here to individual companies.
Porvair's Shiller P/E Ratio of today is calculated as
* 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 Shiller P/E Ratio of Porvair was 60.50. The lowest was 22.45. And the median was 33.03.
Be Aware
Shiller PE Ratio works better for cyclical companies. It gives you a better idea on the company's real earnings power.
Porvair E10 Related Terms
Porvair E10 Historical Data
* Premium members only.
The historical data trend for Porvair's E10 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.
For the Pollution & Treatment Controls subindustry, Porvair's Shiller PE Ratio, along with its competitors' market caps and Shiller PE 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 Shiller PE Ratio vs Industrial Products Industry
For the Industrial Products industry and Industrials sector, Porvair's Shiller PE Ratio distribution charts can be found below:
* The bar in red indicates where Porvair's Shiller PE Ratio falls into.
E10 is a concept invented by Prof. Robert Shiller, who uses E10 for his Shiller P/E calculation. When we calculate the today's Shiller P/E ratio of a stock, we use today's price divided by E10.
What is E10? How do we calculate E10?
E10 is the average of the inflation adjusted earnings of a company over the past 10 years. Let's use an example to explain.
If we want to calculate the E10 of Wal-Mart (WMT) for Dec. 31, 2010, we need to have the inflation data and the earnings from 2001 through 2010.
We adjusted the earnings of 2001 earnings data with the total inflation from 2001 through 2010 to the equivalent earnings in 2010. If the total inflation from 2001 to 2010 is 40%, and Wal-Mart earned $1 a share in 2001, then the 2001's equivalent earnings in 2010 is $1.4 a share. If Wal-Mart earns $1 again in 2002, and the total inflation from 2002 through 2010 is 35%, then the equivalent 2002 earnings in 2010 is $1.35. So on and so forth, you get the equivalent earnings of past 10 years. Then you add them together and divided the sum by 10 to get E10.
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, Porvair's adjusted earnings per share data for the fiscal year that ended in Nov. 2025 was:
Porvair (LSE:PRV) has a E10 of £0.31 as of Nov. 2025. E10 represents the company's inflation-adjusted earnings per share over a 10-year period. View historical data on Porvair and its competitors.
Is Porvair's E10 too high?
Porvair's current E10 is £0.31. Overall, Porvair has a GF Score™ of 93/100 and is considered Fairly Valued, reflecting its overall financial health beyond just this single metric.
How does Porvair's E10 compare to VLTO and ZWS?
Porvair's E10 of £0.31 can be compared against companies in the Industrial Products industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good E10 for an Industrial Products company?
A good E10 depends on the Industrial Products industry context. However, E10 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 E10 mean?
A high E10 can signal that a stock is expensive relative to its fundamentals. E10 represents the company's inflation-adjusted earnings per share over a 10-year period. View historical data on Porvair and its competitors. Porvair's current E10 is £0.31. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Porvair stock overvalued right now?
Based on GuruFocus' analysis, Porvair (LSE:PRV) is currently considered Fairly Valued. The stock's GF Value™ is £7.57, compared to a current price of £8.16 — trading 7.8% above its estimated fair value. The current E10 is £0.31. Porvair's overall GF Score™ is 93/100 with 1 warning sign to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is E10 calculated?
E10 is calculated from a company's financial statements. For Porvair (LSE:PRV), the current E10 is £0.31 as of Nov. 2025. 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 Porvair (LSE:PRV) Overvalued in 2026?
Based on GuruFocus' analysis, Porvair stock appears to be overvalued.
The current stock price of £8.16 is trading 7.8% above its estimated GF Value™ of £7.57.
GuruFocus considers Porvair to be Fairly Valued.
Key valuation signals for LSE:PRV:
E10: £0.31
GF Value™: £7.57 vs. price of £8.16 (7.8% above fair value)
No single metric tells the full story. See the LSE:PRV stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
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
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