MBB SESTU:MBB -4.22%93 Operating Margin % is 9.81% as of Mar. 2026, which is 108% above its 10-year median of 4.72. GuruFocus rates STU:MBB with a GF Score™ of 93/100 and a GF Value™ of €132.47 (Modestly Overvalued). The stock has 1 warning sign investors should review. Among 545 Conglomerates companies, MBB SE ranks better than 74.31% on this metric.
Operating Margin % is calculated as Operating Income divided by its Revenue. MBB SE's Operating Income for the
three
months ended in Mar. 2026 was €23 Mil. MBB SE's Revenue for the
three
months ended in Mar. 2026 was €237 Mil. Therefore, MBB SE's Operating Margin % for the quarter that ended in Mar. 2026 was 9.81%.
Good Sign:
MBB SE operating margin is expanding. Margin expansion is usually a good sign.
The historical rank and industry rank for MBB SE's Operating Margin % or its related term are showing as below:
STU:MBB'
s Operating Margin % Range Over the Past 10 Years
Min: 0.91 Med: 4.72 Max: 12.38
Current: 12.38
STU:MBB's Operating Margin % is ranked better than 74.31% of 545
companies
in the Conglomerates industry
Industry Median: 5.93
vs STU:MBB: 12.38
MBB SE's 5-Year Average Operating Margin % Growth Rate was 45.40% per year.
MBB SE's Operating Income for the
three
months ended in Mar. 2026 was €23 Mil.
Its Operating Income for the trailing twelve months (TTM) ended in Mar. 2026 was €142 Mil.
MBB SE (STU:MBB) 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.
MBB SE Operating Margin % Related Terms
MBB SE Operating Margin % Historical Data
* Premium members only.
The historical data trend for MBB SE'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.
STU:MBB vs HON, MMM: Operating Margin % Comparison
For the Conglomerates subindustry, MBB SE'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.
MBB SE Operating Margin % vs Conglomerates Industry
For the Conglomerates industry and Industrials sector, MBB SE's Operating Margin % distribution charts can be found below:
* The bar in red indicates where MBB SE'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.
MBB SE'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.
MBB SE (STU:MBB) has a Operating Margin % of 9.81% as of Mar. 2026. Operating margin is the ratio of total operating income to net sales. View historical data on MBB SE and its competitors. This is 108% above median its historical median of 4.72. Over the past decade, MBB SE's Operating Margin % has ranged from 0.91 to 12.38. According to the industry distribution chart, MBB SE ranks #140 out of 545 companies in the Conglomerates industry, placing it in the top 25.7%.
Is MBB SE's Operating Margin % too high?
MBB SE's current Operating Margin % of 9.81% is 108% above median its 10-year median of 4.72. Over the past 10 years, this metric has ranged from a low of 0.91 to a high of 12.38. The Conglomerates industry median Operating Margin % is 5.93. MBB SE's value of 9.81% is 65.4% above this industry median. Based on the distribution chart, MBB SE ranks #140 out of 545 companies in the Conglomerates industry, which is above the industry midpoint. Overall, MBB SE has a GF Score™ of 93/100 and is considered Modestly Overvalued, reflecting its overall financial health beyond just this single metric.
How does MBB SE's Operating Margin % compare to HON and MMM?
According to the Conglomerates industry distribution chart, MBB SE ranks #140 out of 545 companies for Operating Margin %. This puts MBB SE in the upper half of its industry. The industry median Operating Margin % is 5.93. MBB SE's value of 9.81% is 65.4% above this benchmark. Historically, MBB SE's own Operating Margin % has ranged from 0.91 to 12.38 over the past decade. While the company's 10-year median is 4.72 vs. the industry median of 5.93, MBB SE 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 Conglomerates company?
The median Operating Margin % among Conglomerates companies is 5.93, based on 545 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. MBB SE's current Operating Margin % of 9.81% is 65.4% 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 MBB SE and its competitors. For the Conglomerates industry, the median Operating Margin % is 5.93 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. MBB SE's current Operating Margin % is 9.81%, which is 108% above median its own 10-year median of 4.72. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is MBB SE stock overvalued right now?
Based on GuruFocus' analysis, MBB SE (STU:MBB) is currently considered Modestly Overvalued. The stock's GF Value™ is €132.47, compared to a current price of €172.40 — trading 30.1% above its estimated fair value. The current Operating Margin % is 9.81%, which is 108% above median its 10-year median of 4.72 and 65.4% above the Conglomerates industry median of 5.93. MBB SE'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 MBB SE (STU:MBB), the current Operating Margin % is 9.81% as of Mar. 2026. 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 MBB SE (STU:MBB) Overvalued in 2026?
Based on GuruFocus' analysis, MBB SE stock appears to be overvalued.
The current stock price of €172.40 is trading 30.1% above its estimated GF Value™ of €132.47.
GuruFocus considers MBB SE to be Modestly Overvalued.
Key valuation signals for STU:MBB:
Operating Margin %: 9.81% (108% above median its 10-year median of 4.72)
GF Value™: €132.47 vs. price of €172.40 (30.1% above fair value)
Industry Position: 65.4% above the Conglomerates median (#140 of 545)
No single metric tells the full story. See the STU:MBB stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
MBB SE is a medium-sized, family-owned company specializing in the acquisition and management of medium-sized industrial companies with considerable technology and engineering expertise. It concentrates on energy transition, e-mobility, cybersecurity, and ecological materials through its subsidiaries. The MBB Group comprises the following reportable segments: Friedrich Vorwerk, Aumann, DTS, Delignit. Aumann AG: Specialized in e-mobility and automation, Friedrich Vorwerk: Focused on energy infrastructure, including gas, power grids, and hydrogen. DTS IT AG: Provides cybersecurity and cloud computing services. Delignit AG: Produces ecological hardwood-based materials and Hanke Tissue: Produces consumer goods like mattresses and tissue paper.
93GF Score
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