PorvairLSE:PRV -1.69%93 Operating Margin % is 13.00% as of Nov. 2025, which is 21% above its 10-year median of 10.72. GuruFocus rates LSE:PRV with a GF Score™ of 93/100 and a GF Value™ of £7.57 (Fairly Valued). The stock has 1 warning sign investors should review. Among 3,038 Industrial Products companies, Porvair ranks better than 75.77% on this metric.
Operating Margin % is calculated as Operating Income divided by its Revenue. Porvair's Operating Income for the
six
months ended in Nov. 2025 was £12.5 Mil. Porvair's Revenue for the
six
months ended in Nov. 2025 was £96.3 Mil. Therefore, Porvair's Operating Margin % for the quarter that ended in Nov. 2025 was 13.00%.
Good Sign:
Porvair PLC operating margin is expanding. Margin expansion is usually a good sign.
The historical rank and industry rank for Porvair's Operating Margin % or its related term are showing as below:
LSE:PRV'
s Operating Margin % Range Over the Past 10 Years
Min: 9.3 Med: 10.72 Max: 12.61
Current: 12.61
LSE:PRV's Operating Margin % is ranked better than 75.77% of 3038
companies
in the Industrial Products industry
Industry Median: 6.53
vs LSE:PRV: 12.61
Porvair's 5-Year Average Operating Margin % Growth Rate was 5.40% per year.
Porvair's Operating Income for the
six
months ended in Nov. 2025 was £12.5 Mil.
Its Operating Income for the trailing twelve months (TTM) ended in Nov. 2025 was £24.5 Mil.
Porvair (LSE:PRV) Operating Margin % Explanation
Just like Gross Margin %, it is important to see a company maintains its operating margin over time. Among the same industry, a company with higher operating margin is more efficient in its operation. It is also more stable during industry slowdown or recessions. Peter Lynch prefers those with higher margins than those with lower margins.
Be Aware
Operating Margin % can be manipulated by adjusting the rate of depreciation, depletion and amortization (DDA).
If a company is facing competition, its Operating Margin % may decline. Often the Operating Margin % declines well before the company's Revenue or even profit decline. Therefore, Operating Margin % is a very important indicator of whether the company is facing problems.
For instance, by 2012, Nokia (NOK)'s problems were well known and its stock had lost more than 90% of its market value since 2007. But Nokias Operating Margin % had already been in decline since 2002, although its Earnings per Share (Diluted) were still rising. Investors who paid attention to Operating Margin % would have avoided this huge loss. The same can be said for Research-in-Motion (RIMM).
Therefore, Operating Margin % is a very important screening filter for GuruFocus. GuruFocus's Buffett-Munger screener requires that the profit margin is either consistent or expanding. The Model Portfolio of the Buffett-Munger screener has outperformed the market every year since inception in 2009.
Porvair Operating Margin % Related Terms
Porvair Operating Margin % Historical Data
* Premium members only.
The historical data trend for Porvair's Operating Margin % 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.
LSE:PRV vs VLTO, ZWS, CECO: Operating Margin % Comparison
For the Pollution & Treatment Controls subindustry, Porvair's Operating Margin %, along with its competitors' market caps and Operating Margin % 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 Operating Margin % vs Industrial Products Industry
For the Industrial Products industry and Industrials sector, Porvair's Operating Margin % distribution charts can be found below:
* The bar in red indicates where Porvair's Operating Margin % falls into.
Operating Margin % - also known as operating income margin, operating profit margin and return on sales (ROS) - is the ratio of Operating Income divided by net sales or Revenue, usually presented in percent.
Porvair's Operating Margin % for the fiscal year that ended in Nov. 2025 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.
Porvair (LSE:PRV) has a Operating Margin % of 13.00% as of Nov. 2025. Operating margin is the ratio of total operating income to net sales. View historical data on Porvair and its competitors. This is 21% above median its historical median of 10.72. Over the past decade, Porvair's Operating Margin % has ranged from 9.30 to 12.61. According to the industry distribution chart, Porvair ranks #736 out of 3038 companies in the Industrial Products industry, placing it in the top 24.2%.
Is Porvair's Operating Margin % too high?
Porvair's current Operating Margin % of 13.00% is 21% above median its 10-year median of 10.72. Over the past 10 years, this metric has ranged from a low of 9.30 to a high of 12.61. The Industrial Products industry median Operating Margin % is 6.53. Porvair's value of 13.00% is 99.1% above this industry median. Based on the distribution chart, Porvair ranks #736 out of 3038 companies in the Industrial Products industry, which is in the top quartile — a strong position relative to peers. 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 Operating Margin % compare to VLTO and ZWS?
According to the Industrial Products industry distribution chart, Porvair ranks #736 out of 3038 companies for Operating Margin %. This places Porvair in the top 24% of its industry — outperforming the majority of peers. The industry median Operating Margin % is 6.53. Porvair's value of 13.00% is 99.1% above this benchmark. Historically, Porvair's own Operating Margin % has ranged from 9.30 to 12.61 over the past decade. While the company's 10-year median is 10.72 vs. the industry median of 6.53, Porvair has consistently been above the industry average. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Operating Margin % for an Industrial Products company?
The median Operating Margin % among Industrial Products companies is 6.53, based on 3,038 companies in the industry. Companies in the top quartile (top 25%) have a Operating Margin % significantly above this median, while those in the bottom quartile fall well below. However, Operating Margin % should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Porvair's current Operating Margin % of 13.00% is 99.1% above the industry median. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Operating Margin % mean?
A high Operating Margin % can signal that a stock is expensive relative to its fundamentals. Operating margin is the ratio of total operating income to net sales. View historical data on Porvair and its competitors. For the Industrial Products industry, the median Operating Margin % is 6.53 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Porvair's current Operating Margin % is 13.00%, which is 21% above median its own 10-year median of 10.72. 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 Operating Margin % is 13.00%, which is 21% above median its 10-year median of 10.72 and 99.1% above the Industrial Products industry median of 6.53. 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 Operating Margin % calculated?
Operating Margin % is calculated from a company's financial statements. For Porvair (LSE:PRV), the current Operating Margin % is 13.00% 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:
Operating Margin %: 13.00% (21% above median its 10-year median of 10.72)
GF Value™: £7.57 vs. price of £8.16 (7.8% above fair value)
Industry Position: 99.1% above the Industrial Products median (#736 of 3038)
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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