Introduction
When evaluating a company’s financial health, investors often focus on earnings per share (EPS) as a primary metric. However, EPS can be misleading due to accounting adjustments, share buybacks, and non-operating income. A better indicator of a company’s profitability and efficiency is the operating profit margin. In this article, I’ll explain why operating profit margin is a more reliable measure of financial performance than EPS, with real-world examples, calculations, and historical data to illustrate the point.
Understanding Operating Profit Margin and EPS
Operating Profit Margin: This metric measures how efficiently a company converts sales into operating profit. It is calculated as: Operating Profit Margin=
\text{Operating Profit Margin} = \frac{\text{Operating Income}}{\text{Revenue}} \times 100Operating income (or EBIT – Earnings Before Interest and Taxes) reflects core business profitability, excluding taxes and financing costs. A higher operating profit margin suggests a company is efficiently managing its costs and generating profits from operations.
Earnings Per Share (EPS): EPS represents a company’s net income divided by the number of outstanding shares: EPS=Net IncomeTotal Outstanding Shares\text{EPS} =
\frac{\text{Net Income}}{\text{Total Outstanding Shares}}While EPS is widely used, it can be influenced by external factors like tax benefits, share buybacks, or one-time gains that don’t necessarily reflect business strength.
Why Operating Profit Margin is More Reliable than EPS
1. EPS Can Be Manipulated, Operating Profit Margin Cannot
Companies can manipulate EPS through share buybacks, reducing the number of outstanding shares to artificially boost EPS without improving profitability. For example:
| Metric | Company A (Before Buyback) | Company A (After Buyback) |
|---|---|---|
| Net Income | $100 million | $100 million |
| Outstanding Shares | 50 million | 40 million |
| EPS | $2.00 | $2.50 |
Despite no improvement in actual profits, EPS increased. This does not indicate better business performance. In contrast, operating profit margin is not affected by share buybacks and reflects the company’s actual efficiency.
2. Focus on Core Business Operations
Operating profit margin isolates operational performance by ignoring taxes, interest, and extraordinary income. EPS, however, includes these external factors. Consider a company that reports high EPS due to a tax credit but has declining operating margins—this is a red flag.
3. Better for Comparing Companies Across Industries
EPS varies based on industry standards, capital structures, and financial policies. Operating profit margin provides a clearer comparison by showing how efficiently companies turn sales into profits.
Example: A comparison between a tech company and a manufacturing firm.
| Metric | Tech Company | Manufacturing Firm |
|---|---|---|
| Revenue | $1 billion | $1 billion |
| Operating Profit | $300 million | $100 million |
| Operating Profit Margin | 30% | 10% |
| EPS | $5 | $3 |
Despite having a lower EPS, the tech company has a much higher operating profit margin, indicating a more efficient and profitable core business.
4. EPS Can Be Volatile, Operating Profit Margin is Stable
EPS can fluctuate due to tax policy changes, debt restructuring, or temporary gains/losses. A stable operating profit margin suggests consistent performance.
For example, during the 2008 financial crisis, many banks had fluctuating EPS due to write-offs and government interventions. Their operating profit margins, however, provided a clearer picture of core business health.
Case Study: Amazon’s Operating Profit Margin vs. EPS
Amazon (AMZN) is a prime example of why operating profit margin is a better indicator than EPS. Between 2015 and 2022, Amazon’s EPS fluctuated due to various factors, including stock compensation expenses and investment gains/losses. However, its operating profit margin consistently improved, reflecting better operational efficiency.
| Year | Revenue ($B) | Operating Income ($B) | Operating Profit Margin | EPS |
|---|---|---|---|---|
| 2015 | 107 | 2.2 | 2.1% | 1.25 |
| 2018 | 233 | 12.4 | 5.3% | 20.14 |
| 2022 | 514 | 22.9 | 4.5% | 0.98 |
Despite EPS volatility, operating profit margin showed steady growth, indicating improved efficiency and sustainability.
Practical Implications for Investors
1. Use Operating Profit Margin for Valuation
Instead of relying on EPS-based valuation methods like P/E ratio, consider using operating profit margin to assess a company’s health. For instance, companies with high and stable operating margins tend to be more resilient during downturns.
2. Prioritize Companies with Consistent Operating Margins
A company with a strong operating margin over time is likely better positioned for growth. Companies with fluctuating EPS but stable margins are often more predictable investments.
3. Assess Industry Trends with Operating Margins
Operating margins provide insights into industry-wide trends. For example, if multiple companies in an industry see declining margins, it may indicate increased competition or rising costs.
Conclusion
While EPS is a popular metric, it has significant limitations due to its susceptibility to manipulation and non-operating influences. Operating profit margin provides a clearer picture of a company’s financial health by focusing on core business efficiency. As an investor, prioritizing operating profit margin over EPS allows for better decision-making and a deeper understanding of a company’s true profitability.
