Griffin MiningLSE:GFM +1.26%85 Operating Margin % is 21.76% as of Dec. 2025, which is 7% above its 10-year median of 20.36. GuruFocus rates LSE:GFM with a GF Score™ of 85/100 and a GF Value™ of £1.29 (Significantly Overvalued). The stock has 8 warning signs investors should review. Among 841 Metals & Mining companies, Griffin Mining ranks better than 72.29% on this metric.
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.
Griffin Mining Operating Margin % Related Terms
Griffin Mining Operating Margin % Historical Data
* Premium members only.
The historical data trend for Griffin Mining'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.
For the Other Industrial Metals & Mining subindustry, Griffin Mining'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.
Griffin Mining Operating Margin % vs Metals & Mining Industry
For the Metals & Mining industry and Basic Materials sector, Griffin Mining's Operating Margin % distribution charts can be found below:
* The bar in red indicates where Griffin Mining'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.
Griffin Mining'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.
Griffin Mining (LSE:GFM) has a Operating Margin % of 21.76% as of Dec. 2025. Operating margin is the ratio of total operating income to net sales. View historical data on Griffin Mining and its competitors. This is near median its historical median of 20.36. Over the past decade, Griffin Mining's Operating Margin % has ranged from 12.49 to 50.35. According to the industry distribution chart, Griffin Mining ranks #233 out of 841 companies in the Metals & Mining industry, placing it in the top 27.7%.
Is Griffin Mining's Operating Margin % too high?
Griffin Mining's current Operating Margin % of 21.76% is near median its 10-year median of 20.36. Over the past 10 years, this metric has ranged from a low of 12.49 to a high of 50.35. The Metals & Mining industry median Operating Margin % is 5.72. Griffin Mining's value of 21.76% is 280.4% above this industry median. Based on the distribution chart, Griffin Mining ranks #233 out of 841 companies in the Metals & Mining industry, which is above the industry midpoint. Overall, Griffin Mining has a GF Score™ of 85/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Griffin Mining's Operating Margin % compare to competitors?
According to the Metals & Mining industry distribution chart, Griffin Mining ranks #233 out of 841 companies for Operating Margin %. This puts Griffin Mining in the upper half of its industry. The industry median Operating Margin % is 5.72. Griffin Mining's value of 21.76% is 280.4% above this benchmark. Historically, Griffin Mining's own Operating Margin % has ranged from 12.49 to 50.35 over the past decade. While the company's 10-year median is 20.36 vs. the industry median of 5.72, Griffin Mining 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 a Metals & Mining company?
The median Operating Margin % among Metals & Mining companies is 5.72, based on 841 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. Griffin Mining's current Operating Margin % of 21.76% is 280.4% 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 Griffin Mining and its competitors. For the Metals & Mining industry, the median Operating Margin % is 5.72 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Griffin Mining's current Operating Margin % is 21.76%, which is near median its own 10-year median of 20.36. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Griffin Mining stock overvalued right now?
Based on GuruFocus' analysis, Griffin Mining (LSE:GFM) is currently considered Significantly Overvalued. The stock's GF Value™ is £1.29, compared to a current price of £3.22 — trading 149.6% above its estimated fair value. The current Operating Margin % is 21.76%, which is near median its 10-year median of 20.36 and 280.4% above the Metals & Mining industry median of 5.72. Griffin Mining's overall GF Score™ is 85/100 with 8 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 Griffin Mining (LSE:GFM), the current Operating Margin % is 21.76% 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 Griffin Mining (LSE:GFM) Overvalued in 2026?
Based on GuruFocus' analysis, Griffin Mining stock appears to be overvalued.
The current stock price of £3.22 is trading 149.6% above its estimated GF Value™ of £1.29.
GuruFocus considers Griffin Mining to be Significantly Overvalued.
Key valuation signals for LSE:GFM:
Operating Margin %: 21.76% (near median its 10-year median of 20.36)
GF Value™: £1.29 vs. price of £3.22 (149.6% above fair value)
Industry Position: 280.4% above the Metals & Mining median (#233 of 841)
No single metric tells the full story. See the LSE:GFM stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Griffin Mining Ltd is a mining and investment company. It is principally engaged in mining and exploration activities. It has only one operating segment, being the operations at the Caijiaying Mine based in China, with production of zinc concentrate, and lead concentrate with associated precious metals credits. The company generates the majority of its revenue from Zinc Concentrates sales.
85GF Score
Get the complete analysis for LSE:GFM
Operating Margin % is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.
Quick Browse
Personalize
Premium Gurus 
Create New Portfolio
LSE:GFM has been successfully added to your 
