Education

Before Judging a Stock, Understand Earnings Per Share

By Walid Mograbi · 2026-04-13 · 1 min read

Price alone does not tell you whether a stock is expensive or cheap unless you also look at earnings per share and risk.

Why this lesson matters

Price alone does not tell you whether a stock is expensive or cheap unless you also look at earnings per share and risk.

The core idea

• Price alone is not enough; review earnings per share and what the market is paying for those earnings.
• The price-to-earnings ratio only makes sense if you also understand the quality of the earnings themselves.
• Annual reports and disclosures reveal the business and risks before you judge the stock from the chart alone.

Practical example

A stock can have a low P/E for a reason if earnings are weak quality or under pressure, so the ratio needs context.

Common mistakes to avoid

• Judging valuation from share price alone.
• Using P/E without checking earnings quality.
• Ignoring annual reports and disclosures.

What to do next

It gives you a simpler base for separating a high share price from a genuinely high valuation.

Important caution

Do not use the P/E ratio in isolation without reading the business, risks, and disclosures.

Further reading

• https://www.investor.gov/introduction-investing/getting-started/researching-investments/how-read-10-k
• https://www.investor.gov/introduction-investing/investing-basics/glossary/price-earnings-pe-ratio
• https://www.investor.gov/index.php/introduction-investing/investing-basics/glossary/annual-report