The price/earnings ratio — usually shortened to P/E ratio or P/E — is one of the most widely referenced valuation metrics in equity research. It appears in analyst reports, financial news, and broker research on NGX-listed companies. Understanding what the P/E ratio measures — and equally important, what it does not measure — is useful for anyone researching Nigerian shares. The P/E ratio is a research tool, not a buy or sell signal.
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Definition
The price/earnings ratio (P/E ratio) compares a company's current share price to its earnings per share. It shows how much investors are paying for each unit of a company's annual profit.
The P/E ratio is calculated by dividing the current share price by the earnings per share (EPS). EPS is the company's total annual profit divided by its total number of shares in issue. For example, if a share trades at ₦60 and the company earned ₦6 per share in the last financial year, the P/E ratio is 10x (₦60 ÷ ₦6). This is described as the shares trading at "10 times earnings".
A high P/E ratio may indicate that investors expect the company to grow its earnings significantly in the future — they are paying a premium for anticipated growth. A low P/E ratio may indicate a more mature, lower-growth company, or one that is perceived to carry more risk. It can also indicate that a company is undervalued relative to its peers. Neither a high nor a low P/E ratio automatically indicates a good or bad investment — context is essential.
P/E ratios vary significantly across sectors and should generally be compared within sectors rather than across them. Banks in Nigeria are typically valued at different P/E multiples to consumer goods companies because their earnings profiles, growth rates, and capital structures differ. Comparing a bank's P/E to an FMCG company's P/E without accounting for these differences would be misleading.
P/E ratios reflect investor expectations, not just current profitability. A company expected to double its earnings over the next few years will typically trade at a higher P/E than one with stable, mature earnings. Conversely, a company facing regulatory or competitive challenges may trade at a lower P/E even if its current earnings are strong. The P/E ratio captures market sentiment as much as current financial performance.
The P/E ratio has important limitations. It uses historical earnings, which may not reflect current conditions. It does not account for debt levels, cash generation, or balance sheet strength. Earnings can be manipulated through accounting choices. For these reasons, experienced investors use the P/E ratio alongside other metrics — such as price-to-book, dividend yield, cash flow ratios, and qualitative factors — rather than relying on it in isolation.
Divide the current share price by the earnings per share (EPS). EPS is the company's total annual profit divided by its shares in issue. P/E = Share price ÷ EPS.
A high P/E may suggest that investors expect strong future earnings growth, or that the share is priced optimistically relative to its current earnings. It does not automatically mean a share is overvalued or that you should not buy it. Context and sector comparisons matter.
Not necessarily. A low P/E may reflect genuine value, or it may indicate that the company faces significant challenges, declining earnings, or structural problems. This is sometimes called a "value trap." Always investigate why a P/E ratio is low before drawing conclusions.
P/E ratios for NGX companies are published by financial data providers, stockbroker research, and financial news sources that cover Nigerian equities. The NGX website also publishes financial data for listed companies.
Yes. If a company is making a loss (negative earnings), the P/E ratio is negative or listed as "N/A". A negative P/E simply means the company is not currently profitable and the ratio is not meaningful.
The P/E ratio is used to analyse bank stocks, but analysts often prefer price-to-book (P/B) and return on equity (ROE) metrics for banks because their balance sheets are structured differently from industrial or consumer companies. P/E is more useful for bank comparisons when used alongside these other metrics.
Important disclaimer
This article is for general information and educational purposes only. It does not constitute financial advice, investment advice, legal advice, or tax advice. The value of investments can fall as well as rise. Seek independent regulated financial advice before making any investment decision. Shares Saver does not provide financial advice.
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