Spirax GroupLSE:SPX +1.38%88 Operating Margin % is 14.08% as of Dec. 2025, which is 31% below its 10-year median of 20.53. GuruFocus rates LSE:SPX with a GF Score™ of 88/100 and a GF Value™ of £82.22 (Modestly Undervalued). The stock has 4 warning signs investors should review. Among 3,038 Industrial Products companies, Spirax Group ranks better than 83.94% on this metric.
Operating Margin % is calculated as Operating Income divided by its Revenue. Spirax Group's Operating Income for the
six
months ended in Dec. 2025 was £124 Mil. Spirax Group's Revenue for the
six
months ended in Dec. 2025 was £881 Mil. Therefore, Spirax Group's Operating Margin % for the quarter that ended in Dec. 2025 was 14.08%.
Warning Sign:
Spirax Group PLC operating margin has been in a 5-year decline. The average rate of decline per year is -6.2%.
The historical rank and industry rank for Spirax Group's Operating Margin % or its related term are showing as below:
LSE:SPX'
s Operating Margin % Range Over the Past 10 Years
Min: 15.59 Med: 20.53 Max: 23.72
Current: 15.59
LSE:SPX's Operating Margin % is ranked better than 83.94% of 3038
companies
in the Industrial Products industry
Industry Median: 6.53
vs LSE:SPX: 15.59
Spirax Group's 5-Year Average Operating Margin % Growth Rate was -6.20% per year.
Spirax Group (LSE:SPX) 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.
Spirax Group Operating Margin % Related Terms
Spirax Group Operating Margin % Historical Data
* Premium members only.
The historical data trend for Spirax Group'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:SPX vs GEV, ETN, PH: Operating Margin % Comparison
For the Specialty Industrial Machinery subindustry, Spirax Group'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.
Spirax Group Operating Margin % vs Industrial Products Industry
For the Industrial Products industry and Industrials sector, Spirax Group's Operating Margin % distribution charts can be found below:
* The bar in red indicates where Spirax Group'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.
Spirax Group's Operating Margin % for the fiscal year that ended in Dec. 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.
Spirax Group (LSE:SPX) has a Operating Margin % of 14.08% as of Dec. 2025. Operating margin is the ratio of total operating income to net sales. View historical data on Spirax Group and its competitors. This is 31% below median its historical median of 20.53. Over the past decade, Spirax Group's Operating Margin % has ranged from 15.59 to 23.72. According to the industry distribution chart, Spirax Group ranks #488 out of 3038 companies in the Industrial Products industry, placing it in the top 16.1%.
Is Spirax Group's Operating Margin % too high?
Spirax Group's current Operating Margin % of 14.08% is 31% below median its 10-year median of 20.53. Over the past 10 years, this metric has ranged from a low of 15.59 to a high of 23.72. The Industrial Products industry median Operating Margin % is 6.53. Spirax Group's value of 14.08% is 115.6% above this industry median. Based on the distribution chart, Spirax Group ranks #488 out of 3038 companies in the Industrial Products industry, which is in the top quartile — a strong position relative to peers. Overall, Spirax Group has a GF Score™ of 88/100 and is considered Modestly Undervalued, reflecting its overall financial health beyond just this single metric.
How does Spirax Group's Operating Margin % compare to GEV and ETN?
According to the Industrial Products industry distribution chart, Spirax Group ranks #488 out of 3038 companies for Operating Margin %. This places Spirax Group in the top 16% of its industry — outperforming the majority of peers. The industry median Operating Margin % is 6.53. Spirax Group's value of 14.08% is 115.6% above this benchmark. Historically, Spirax Group's own Operating Margin % has ranged from 15.59 to 23.72 over the past decade. While the company's 10-year median is 20.53 vs. the industry median of 6.53, Spirax Group 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. Spirax Group's current Operating Margin % of 14.08% is 115.6% 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 Spirax Group 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. Spirax Group's current Operating Margin % is 14.08%, which is 31% below median its own 10-year median of 20.53. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Spirax Group stock overvalued right now?
Based on GuruFocus' analysis, Spirax Group (LSE:SPX) is currently considered Modestly Undervalued. The stock's GF Value™ is £82.22, compared to a current price of £69.85 — trading 15% below its estimated fair value. The current Operating Margin % is 14.08%, which is 31% below median its 10-year median of 20.53 and 115.6% above the Industrial Products industry median of 6.53. Spirax Group's overall GF Score™ is 88/100 with 4 warning signs 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 Spirax Group (LSE:SPX), the current Operating Margin % is 14.08% as of Dec. 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 Spirax Group (LSE:SPX) Overvalued in 2026?
Based on GuruFocus' analysis, Spirax Group stock appears to be undervalued.
The current stock price of £69.85 is trading 15% below its estimated GF Value™ of £82.22.
GuruFocus considers Spirax Group to be Modestly Undervalued.
Key valuation signals for LSE:SPX:
Operating Margin %: 14.08% (31% below median its 10-year median of 20.53)
GF Value™: £82.22 vs. price of £69.85 (15% below fair value)
Industry Position: 115.6% above the Industrial Products median (#488 of 3038)
No single metric tells the full story. See the LSE:SPX stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Spirax is a global manufacturer of a wide range of applications for industrial and commercial steam systems, electric thermal solutions, and peristaltic pumps used across multiple industries. The group operates across three segments and has over 110,000 direct customers across 130 countries. Approximately 85% of group sales are generated from recurring maintenance and small improvements to existing customer systems. Spirax has 1,700 product lines and 2,100 sales and service engineers, who account for 25% of employees.
88GF Score
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