Want to learn stock selection like Warren Buffett, but feel overwhelmed when you open a company’s financial statements? In fact, you only need one key indicator to quickly assess a company’s profitability, and that indicator is “Return on Equity (ROE)”. Many beginner investors have heard of it but do not know how to use it, and some even mistakenly believe that a high ROE is always good. This article will explain in the simplest and most direct way what a high ROE indicates, break down the ROE calculation formula, and provide a practical four-step strategy to teach you how to use ROE for stock selection, helping you identify truly high-quality potential stocks in a complex market.
Return on Equity (ROE), also commonly referred to as equity return, is a financial metric used to measure “how much profit a company can generate using shareholders’ funds”. In simple terms, ROE tells you how much profit the company can earn in a year for every dollar you invest as a shareholder.
For example, if a company’s ROE is 20%, it means that for every 100 dollars invested by shareholders, the company can generate 20 dollars in net profit after tax. Therefore, ROE can be regarded as a “report card” of how efficiently a company generates profit for its shareholders. A high and stable ROE usually indicates strong profitability and operational efficiency.
Warren Buffett once said, “If I could only use one metric to select stocks, I would choose ROE”. He even set a threshold, only considering companies with a stable ROE of over 15% for many consecutive years. Why does he value ROE so highly? The main reasons are as follows:
As ROE reflects a company’s quality from multiple perspectives, it has become a core indicator that value investors always analyze when selecting stocks.
The ROE calculation formula is very simple and straightforward:
ROE = (Net Income After Tax / Average Shareholders’ Equity) x 100%
The two key components are explained as follows:
To calculate ROE, you need to refer to two main financial statements:
For Hong Kong-listed companies, investors can conveniently search and download annual reports (annual financial report) or interim reports (half‑year financial report) from the Hong Kong Exchanges and Clearing “HKEXnews” website, where all required financial data is clearly presented.
After calculating a company’s ROE and arriving at a figure, the natural question is: “What does a high ROE indicate? Is the higher, the better?” The answer is: not necessarily. We need to analyze more deeply the reasons behind a high ROE.
Setting aside special cases, a consistently high ROE usually means the company has the following advantages:
Do not get excited too early when you see a high ROE, because some high ROE figures may be “artificial strength” that hide significant risks. Investors must watch out for the following three traps:
So what level of ROE is considered reasonable? There is no absolute standard, because different industries have very different business models and capital structures. For example, asset-light industries such as technology and consumer goods generally have higher ROE, while asset-heavy industries such as banking, utilities, and real estate, which require substantial capital investment, naturally have lower ROE.
Therefore, the most important principle is to compare the target company’s ROE with that of its peers in the same industry. Only if a company’s ROE can consistently outperform the industry average over the long term does it truly demonstrate exceptional strength.
After understanding the basic concept and calculation formula of ROE, the most important part is applying it in practice. Below is a simple and effective four-step ROE stock selection strategy designed specifically for beginners:
The first step is initial screening. Use a stock screening tool and set the condition that ROE must be above 15% for 5 consecutive years. Why 5 years and 15%?
After screening out a list, do not look only at the latest year’s figure. Instead, lay out the ROE data for the past 5 to 10 years and observe the trend.
This step is meant to filter out the “high debt trap” mentioned earlier. Analyze ROE together with the debt ratio (Debt-to-Equity Ratio). The formula for the debt ratio is: total liabilities / shareholders’ equity.
An ideal investment target should have “high ROE and low debt“. If a company has a very high ROE but also a very high debt ratio (for example, over 200% or far above industry peers), caution is warranted. The high ROE in such cases may be driven primarily by borrowed funds, which carries significant financial risk. A deeper analysis of the company’s debt ratio can provide a more comprehensive assessment of its financial health.
Data analysis is only the first step. The most important thing is to return to fundamentals and understand the business itself. By reading the company’s annual reports, analyst reports, and related news, try to answer the following questions:
Only when you understand the business logic behind the numbers will your investment decisions become more solid and reliable.
A: A negative ROE indicates that the company is in a loss-making position in terms of net profit after tax. When the numerator (net profit after tax) is negative, the calculated ROE will naturally be negative. For such companies, investors need to be extremely cautious, as they lack even the most basic ability to generate profits. Unless you have strong confidence in a turnaround of its business, it is generally advisable to avoid them.
A: Generally, asset-light industries with high gross margins and strong brand effects tend to have higher ROE. For example, software technology, branded consumer goods (such as luxury products and beverages), and healthcare. In contrast, asset-heavy industries that require substantial fixed asset investment, such as banking, insurance, real estate, utilities, and airlines, usually have lower ROE.
A: Both ROE (Return on Equity) and ROA (Return on Assets) are indicators used to measure a company’s profitability, but they focus on different perspectives. ROE measures how efficiently a company generates profit for “shareholders”, while ROA measures how efficiently a company uses “total assets” (including both shareholders’ funds and borrowed funds) to generate profit. The formula for ROA is: net profit after tax / total assets. Comparing ROE and ROA together can reveal the company’s level of financial leverage. If ROE is significantly higher than ROA, it indicates that the company is using more debt to operate.
A: Absolutely! DuPont Analysis is an advanced financial analysis tool that breaks ROE into three components: ROE = Net Profit Margin x Asset Turnover x Equity Multiplier. Through this breakdown, you can clearly see whether a company’s high ROE comes from “strong profitability” (high net profit margin), “efficient operations” (high asset turnover), or “high leverage” (high equity multiplier). This method helps you more precisely identify the drivers behind ROE.
In summary, Return on Equity (ROE) is a very powerful financial indicator, like a “truth-revealing mirror” that helps us quickly assess a company’s real profitability and operational quality. However, remember that investment decisions should not rely on a single indicator. A prudent investor will use ROE as an initial screening tool, and then combine it with analysis of debt ratios, cash flow, industry outlook, and company fundamentals to truly identify high-quality stocks worth holding for the long term. It is hoped that the ROE calculation formula and the four-step stock selection strategy provided in this article will help you master the use of this key indicator and move more steadily and further along your investment journey.
