SISB PCLBKK:SISB 88 Operating Margin % is 32.87% as of Mar. 2026, which is 61% above its 10-year median of 20.38. GuruFocus rates BKK:SISB with a GF Score™ of 88/100 and a GF Value™ of ฿34.99 (Significantly Undervalued). The stock has 2 warning signs investors should review. Among 258 Education companies, SISB PCL ranks better than 89.15% on this metric.
Operating Margin % is calculated as Operating Income divided by its Revenue. SISB PCL's Operating Income for the
three
months ended in Mar. 2026 was ฿206 Mil. SISB PCL's Revenue for the
three
months ended in Mar. 2026 was ฿626 Mil. Therefore, SISB PCL's Operating Margin % for the quarter that ended in Mar. 2026 was 32.87%.
Good Sign:
SISB PCL operating margin is expanding. Margin expansion is usually a good sign.
The historical rank and industry rank for SISB PCL's Operating Margin % or its related term are showing as below:
BKK:SISB'
s Operating Margin % Range Over the Past 10 Years
Min: 7.9 Med: 20.38 Max: 36.95
Current: 34.77
BKK:SISB's Operating Margin % is ranked better than 89.15% of 258
companies
in the Education industry
Industry Median: 9.46
vs BKK:SISB: 34.77
SISB PCL's 5-Year Average Operating Margin % Growth Rate was 17.00% per year.
SISB PCL's Operating Income for the
three
months ended in Mar. 2026 was ฿206 Mil.
Its Operating Income for the trailing twelve months (TTM) ended in Mar. 2026 was ฿875 Mil.
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.
SISB PCL Operating Margin % Related Terms
SISB PCL Operating Margin % Historical Data
* Premium members only.
The historical data trend for SISB PCL'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.
BKK:SISB vs EDU, TAL, GHC: Operating Margin % Comparison
For the Education & Training Services subindustry, SISB PCL'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.
SISB PCL Operating Margin % vs Education Industry
For the Education industry and Consumer Defensive sector, SISB PCL's Operating Margin % distribution charts can be found below:
* The bar in red indicates where SISB PCL'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.
SISB PCL'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.
SISB PCL (BKK:SISB) has a Operating Margin % of 32.87% as of Mar. 2026. Operating margin is the ratio of total operating income to net sales. View historical data on SISB PCL and its competitors. This is 61% above median its historical median of 20.38. Over the past decade, SISB PCL's Operating Margin % has ranged from 7.90 to 36.95. According to the industry distribution chart, SISB PCL ranks #28 out of 258 companies in the Education industry, placing it in the top 10.9%.
Is SISB PCL's Operating Margin % too high?
SISB PCL's current Operating Margin % of 32.87% is 61% above median its 10-year median of 20.38. Over the past 10 years, this metric has ranged from a low of 7.90 to a high of 36.95. The Education industry median Operating Margin % is 9.46. SISB PCL's value of 32.87% is 247.5% above this industry median. Based on the distribution chart, SISB PCL ranks #28 out of 258 companies in the Education industry, which is in the top quartile — a strong position relative to peers. Overall, SISB PCL has a GF Score™ of 88/100 and is considered Significantly Undervalued, reflecting its overall financial health beyond just this single metric.
How does SISB PCL's Operating Margin % compare to EDU and TAL?
According to the Education industry distribution chart, SISB PCL ranks #28 out of 258 companies for Operating Margin %. This places SISB PCL in the top 11% of its industry — outperforming the majority of peers. The industry median Operating Margin % is 9.46. SISB PCL's value of 32.87% is 247.5% above this benchmark. Historically, SISB PCL's own Operating Margin % has ranged from 7.90 to 36.95 over the past decade. While the company's 10-year median is 20.38 vs. the industry median of 9.46, SISB PCL 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 Education company?
The median Operating Margin % among Education companies is 9.46, based on 258 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. SISB PCL's current Operating Margin % of 32.87% is 247.5% 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 SISB PCL and its competitors. For the Education industry, the median Operating Margin % is 9.46 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. SISB PCL's current Operating Margin % is 32.87%, which is 61% above median its own 10-year median of 20.38. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is SISB PCL stock overvalued right now?
Based on GuruFocus' analysis, SISB PCL (BKK:SISB) is currently considered Significantly Undervalued. The stock's GF Value™ is ฿34.99, compared to a current price of ฿9.65 — trading 72.4% below its estimated fair value. The current Operating Margin % is 32.87%, which is 61% above median its 10-year median of 20.38 and 247.5% above the Education industry median of 9.46. SISB PCL's overall GF Score™ is 88/100 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 SISB PCL (BKK:SISB), the current Operating Margin % is 32.87% 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 SISB PCL (BKK:SISB) Overvalued in 2026?
Based on GuruFocus' analysis, SISB PCL stock appears to be undervalued.
The current stock price of ฿9.65 is trading 72.4% below its estimated GF Value™ of ฿34.99.
GuruFocus considers SISB PCL to be Significantly Undervalued.
Key valuation signals for BKK:SISB:
Operating Margin %: 32.87% (61% above median its 10-year median of 20.38)
GF Value™: ฿34.99 vs. price of ฿9.65 (72.4% below fair value)
Industry Position: 247.5% above the Education median (#28 of 258)
No single metric tells the full story. See the BKK:SISB stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
SISB PCL is principally engaged in the operation of international schools. Its operations are carried on only in Thailand. It is a provider of the Singapore curriculum for Mathematics and Science, with a focus on English, based on the Programme for International Student Assessment (PISA). It has five campuses in Thailand, which adopt the Singapore curriculum and Cambridge IGCSE A and AS Levels, as well as the International Baccalaureate. It teaches students to be trilingual: English, Thai, and Chinese, in addition to a holistic education to develop students to their fullest potential.
88GF Score
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