National Aluminium CoBOM:532234 -4.60%80 Operating Margin % is 42.15% as of Dec. 2025, which is 217% above its 10-year median of 13.29. GuruFocus rates BOM:532234 with a GF Score™ of 80/100 and a GF Value™ of ₹209.86 (Significantly Overvalued). The stock has 2 warning signs investors should review. Among 840 Metals & Mining companies, National Aluminium Co ranks better than 88.21% on this metric.
The historical rank and industry rank for National Aluminium Co's Operating Margin % or its related term are showing as below:
BOM:532234'
s Operating Margin % Range Over the Past 10 Years
Min: -0.06 Med: 13.29 Max: 42.6
Current: 42.6
BOM:532234's Operating Margin % is ranked better than 88.21% of 840
companies
in the Metals & Mining industry
Industry Median: 5.86
vs BOM:532234: 42.60
National Aluminium Co's 5-Year Average Operating Margin % Growth Rate was 0.00% per year.
National Aluminium Co (BOM:532234) 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.
National Aluminium Co Operating Margin % Related Terms
National Aluminium Co Operating Margin % Historical Data
* Premium members only.
The historical data trend for National Aluminium Co'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 Aluminum subindustry, National Aluminium Co'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.
National Aluminium Co Operating Margin % vs Metals & Mining Industry
For the Metals & Mining industry and Basic Materials sector, National Aluminium Co's Operating Margin % distribution charts can be found below:
* The bar in red indicates where National Aluminium Co's Operating Margin % falls into.
National Aluminium Co Operating Margin % Calculation
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.
National Aluminium Co's Operating Margin % for the fiscal year that ended in Mar. 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.
National Aluminium Co (BOM:532234) has a Operating Margin % of 42.15% as of Dec. 2025. Operating margin is the ratio of total operating income to net sales. View historical data on National Aluminium Co and its competitors. This is 217% above median its historical median of 13.29. According to the industry distribution chart, National Aluminium Co ranks #99 out of 840 companies in the Metals & Mining industry, placing it in the top 11.8%.
Is National Aluminium Co's Operating Margin % too high?
National Aluminium Co's current Operating Margin % of 42.15% is 217% above median its 10-year median of 13.29. The Metals & Mining industry median Operating Margin % is 5.86. National Aluminium Co's value of 42.15% is 619.3% above this industry median. Based on the distribution chart, National Aluminium Co ranks #99 out of 840 companies in the Metals & Mining industry, which is in the top quartile — a strong position relative to peers. Overall, National Aluminium Co has a GF Score™ of 80/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does National Aluminium Co's Operating Margin % compare to AA?
According to the Metals & Mining industry distribution chart, National Aluminium Co ranks #99 out of 840 companies for Operating Margin %. This places National Aluminium Co in the top 12% of its industry — outperforming the majority of peers. The industry median Operating Margin % is 5.86. National Aluminium Co's value of 42.15% is 619.3% above this benchmark. While the company's 10-year median is 13.29 vs. the industry median of 5.86, National Aluminium Co 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 5.86, based on 840 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. National Aluminium Co's current Operating Margin % of 42.15% is 619.3% 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 National Aluminium Co and its competitors. For the Metals & Mining industry, the median Operating Margin % is 5.86 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. National Aluminium Co's current Operating Margin % is 42.15%, which is 217% above median its own 10-year median of 13.29. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is National Aluminium Co stock overvalued right now?
Based on GuruFocus' analysis, National Aluminium Co (BOM:532234) is currently considered Significantly Overvalued. The stock's GF Value™ is ₹209.86, compared to a current price of ₹332.20 — trading 58.3% above its estimated fair value. The current Operating Margin % is 42.15%, which is 217% above median its 10-year median of 13.29 and 619.3% above the Metals & Mining industry median of 5.86. National Aluminium Co's overall GF Score™ is 80/100 with 2 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 National Aluminium Co (BOM:532234), the current Operating Margin % is 42.15% 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 National Aluminium Co (BOM:532234) Overvalued in 2026?
Based on GuruFocus' analysis, National Aluminium Co stock appears to be overvalued.
The current stock price of ₹332.20 is trading 58.3% above its estimated GF Value™ of ₹209.86.
GuruFocus considers National Aluminium Co to be Significantly Overvalued.
Key valuation signals for BOM:532234:
Operating Margin %: 42.15% (217% above median its 10-year median of 13.29)
GF Value™: ₹209.86 vs. price of ₹332.20 (58.3% above fair value)
Industry Position: 619.3% above the Metals & Mining median (#99 of 840)
No single metric tells the full story. See the BOM:532234 stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
National Aluminium Co Ltd mines, produces and sells aluminum and alumina-based products in two segments: Aluminium and Chemicals. The company controls all stages of the aluminum process. The firm mines bauxite and refines it into alumina, then smelts maximum of the alumina into aluminum. The aluminum segment, which generates the majority of revenue, sells aluminum-based products. The chemicals segment sells calcinated alumina and alumina hydrate. The firm also owns and operates multiple power plants throughout India. The company derives maximum revenue from Aluminum segment.
80GF Score
Get the complete analysis for BOM:532234
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
BOM:532234 has been successfully added to your 
