The Investor's Metric Toolkit: What to Look For Before Buying Any Stock
- Naomi
- May 13
- 9 min read
A complete breakdown of every major stock metric, what it means, how to calculate it, and how to use it on Nigerian and global stocks.
Most people buy stocks the wrong way. They see a price going up, hear a hot tip from a WhatsApp group, or watch a stock feature on a business channel and they buy. Then the price drops and they have no idea why. The problem is not the stock. The problem is that they skipped the analysis.
Metrics and financial ratios exist for one reason: to give you an objective, numbers-based view of a company's health and value before you commit your hard-earned naira. The investors who consistently make money are not the ones who predict the future. They are the ones who read the data correctly.
In this post, we break down every major stock metric you need to understand, what it is, how it is calculated, what it tells you, and how it applies to Nigerian Exchange Group (NGX) stocks like Dangote Cement, Zenith Bank, and MTN Nigeria, as well as global stocks.
📖 HOW TO USE THIS GUIDE Read it once end-to-end to build context. Then bookmark it and use it as a reference whenever you are reviewing a stock. Every metric covered here has real examples rooted in the Nigerian market. |
Earnings Per Share (EPS) Formula: EPS = (Net Profit − Preferred Dividends) ÷ Total Shares Outstanding What It Tells You: EPS tells you how much profit the company made for each share outstanding. It is the most fundamental measure of a company's profitability. Higher EPS generally means the company is more profitable. But context matters: a higher EPS is only meaningful compared to previous years or peer companies.
Nigerian Example: Zenith Bank reported a full-year EPS of ₦10.32 in 2023. That means for every single share you hold, Zenith generated ₦10.32 in profit. If you bought 10,000 shares, the company earned ₦103,200 on your behalf, not necessarily paid to you, but generated as profit that could fuel dividends or growth.
Healthy Range: Growing EPS year-over-year is the gold standard. Look for at least 10–15% EPS growth annually in strong companies. Compare EPS against the same company's historical numbers and sector peers.
Red Flag: Declining EPS over two or more consecutive years. Negative EPS (the company is making a loss). Also watch for inflated EPS caused by share buybacks rather than genuine profit growth.
Price-to-Earnings Ratio (P/E) Formula: P/E = Current Share Price ÷ Earnings Per Share (EPS) What It Tells You: The P/E ratio answers the question: how much are investors willing to pay for each naira (or dollar) of this company's earnings? A P/E of 10 means investors pay ₦10 for every ₦1 of earnings. A high P/E suggests the market expects strong future growth or the stock may be overvalued. A low P/E may mean the stock is undervalued or the company is struggling.
Nigerian Example: Suppose Dangote Cement trades at ₦280 per share and its EPS is ₦20. The P/E ratio is 280 ÷ 20 = 14x. That means the market values the company at 14 times its annual earnings. On the NGX, the average P/E for industrial companies tends to hover between 8x and 20x. Dangote at 14x is reasonable not cheap, not expensive.
Healthy Range: Compare to the sector average. A company trading below its sector P/E average with strong earnings could be undervalued. Nigerian banking stocks historically trade at P/E ratios of 3x–8x, while consumer goods can go 10x–25x.
Red Flag: Never look at P/E in isolation. A P/E of 3x in a bank might be normal or it might signal the market has priced in serious risk. Also beware: if a company has negative earnings (a loss), the P/E ratio is meaningless or undefined.
Price-to-Book Ratio (P/B) Formula: P/B = Market Price Per Share ÷ Book Value Per Share What It Tells You: The P/B ratio compares what the market says a company is worth (market cap) to what the company is actually worth on paper (net assets). Book value is what shareholders would theoretically receive if the company was liquidated today, assets minus liabilities. A P/B below 1.0 means the stock trades below its net asset value, which can indicate undervaluation.
Nigerian Example: Stanbic IBTC Holdings has significant assets in its banking, insurance, and asset management divisions. If its book value per share is ₦30 and it trades at ₦42, the P/B is 1.4x, investors are paying a 40% premium to book value, reflecting the market's confidence in future profitability beyond its current assets.
Healthy Range: For Nigerian banks, P/B below 1.0 has historically been a bargain signal especially when accompanied by strong ROE. For industrial companies, P/B of 1x–3x is typical. Tech companies can trade at very high P/B ratios (10x+) because their value lies in intangibles, not physical assets.
Red Flag: A company with P/B below 1.0 AND declining ROE (see below) may be a value trap cheap for good reason. Never buy just because something is 'below book value'.
Return on Equity (ROE) Formula: ROE = Net Profit ÷ Shareholders' Equity × 100 What It Tells You: ROE measures how efficiently a company uses shareholder money to generate profits. It answers: for every ₦100 of shareholders' funds in this business, how many naira of profit does management produce? High ROE means management is highly effective at generating returns. This is one of Warren Buffett's favourite metrics.
Nigerian Example: Guaranty Trust Holding Company (GTCO) has historically posted ROE figures of 25–35%, which is exceptionally strong even by global standards. That means for every ₦100 invested by shareholders, management returns ₦25–35 in profit annually. Compare this to a company with 8% ROE, same capital, far less efficiency.
Healthy Range: Look for consistent ROE above 15% over a 3–5 year period. In Nigerian banking, 20%+ ROE is considered strong. For manufacturing, 10–15% is respectable given higher capital requirements.
Red Flag: ROE can be artificially inflated by high debt. A company with tiny equity (because it is heavily leveraged) will show a high ROE without actually being efficient. Always pair ROE analysis with the Debt-to-Equity ratio.
Dividend Yield & Payout Ratio Formula: Dividend Yield = Annual Dividend Per Share ÷ Current Share Price × 100 What It Tells You: Dividend yield tells you how much cash return you receive annually from dividends, expressed as a percentage of the current share price. It is the stock market equivalent of interest on a savings account except it can grow over time. This is crucial for income-focused investors, especially those who want passive cash flow from their portfolio.
Nigerian Example: Zenith Bank declares ₦3.50 per share in dividends annually. If the share price is ₦35, the dividend yield is 3.50 ÷ 35 × 100 = 10%. At current Nigerian bank yields, this is competitive with short-term fixed income, with the added upside of potential share price appreciation.
Healthy Range: For Nigerian stocks, 5–12% dividend yield is attractive for income investing. However, an unusually high yield (above 15–20%) may be a red flag, it often means the share price has crashed, not that the company is generous.
Red Flag: A very high dividend yield with falling earnings often precedes a dividend cut. Also, some companies pay dividends they cannot afford, check the payout ratio: if a company pays out more than 80–90% of its earnings as dividends while earnings are declining, the dividend may not be sustainable.
Payout Ratio Formula: Payout Ratio = Dividends Per Share ÷ EPS × 100 What It Tells You: The payout ratio shows what percentage of earnings a company distributes as dividends. A 40% payout ratio means the company keeps 60% of profits to reinvest in growth and pays out 40% to shareholders. Neither high nor low is inherently better, it depends on the company's growth stage and strategy.
Nigerian Example: A mature, stable company like Nestle Nigeria or Nigerian Breweries might have a payout ratio of 60–80%, reflecting limited reinvestment needs and a commitment to returning cash to shareholders. A growth-stage company like a new fintech listing may pay zero dividends and reinvest everything.
Healthy Range: For stable income stocks: payout ratio of 40–70% is healthy enough income for shareholders, enough retained for growth. For growth stocks, 0–30% is acceptable as earnings are reinvested.
Red Flag: Payout ratio above 100% means the company is paying out more in dividends than it earns. This is only sustainable temporarily and usually signals an impending dividend cut.
Debt-to-Equity Ratio (D/E) Formula: D/E = Total Debt ÷ Total Shareholders' Equity What It Tells You: The D/E ratio shows how much of the company's operations are funded by debt versus shareholder money. A D/E of 2.0 means the company has ₦2 of debt for every ₦1 of equity. Debt amplifies both profits and losses, it's the double-edged sword of corporate finance. In a high-interest-rate environment like Nigeria's, high debt becomes very expensive very quickly.
Nigerian Example: Imagine two cement companies: Company A has D/E of 0.5x (mostly equity funded), Company B has D/E of 3.0x (heavily debt funded). When interest rates rise from 15% to 25%, Company B's interest payments explode. Its profit margin gets squeezed even if cement sales are identical. Company A barely feels it.
Healthy Range: For manufacturing/industrial companies: D/E below 1.5x is generally comfortable. For banks: D/E analysis is replaced by Capital Adequacy Ratio, banks are structurally leveraged. For non-financial companies in high-rate environments like Nigeria: D/E below 1.0x is preferred.
Red Flag: D/E above 3.0x in a non-financial Nigerian company is a serious warning sign, especially when interest rates are high. Also watch for companies that refinance short-term debt repeatedly they are always one bad month from a liquidity crisis.
Revenue Growth & Profit Margin Formula: Revenue Growth = (Current Year Revenue − Prior Year Revenue) ÷ Prior Year Revenue × 100 What It Tells You: Revenue growth tells you whether the company's core business is expanding. A company can temporarily boost EPS through cost cuts or financial engineering but genuine revenue growth means customers are buying more, the market is expanding, or the company is taking market share. It is the top-line signal that everything else depends on.
Nigerian Example: MTN Nigeria's revenue grew significantly in recent years driven by data growth and fintech (MoMo). Even as inflation squeezed consumers, revenue grew because mobile data is now nearly essential infrastructure. This is what a structurally growing business looks like, demand is inelastic even in hard times.
Healthy Range: For growth-stage companies: 15–30%+ revenue growth annually. For mature companies: 5–15% is healthy. Revenue growing faster than inflation is the minimum bar for a company holding its real value.
Red Flag: Revenue declining for two or more consecutive years, or revenue growing slower than inflation (meaning the company is shrinking in real terms). Also watch for revenue that grows only because of acquisitions, not organic business expansion. Net Profit Margin Formula: Net Profit Margin = Net Profit ÷ Revenue × 100 What It Tells You: Profit margin shows how much of every naira of revenue survives as profit after all costs: salaries, raw materials, interest, taxes are paid. It is a measure of operational efficiency and pricing power. Companies with strong brands and moats (like Nestle or Nigerian Breweries) tend to maintain higher margins than companies in competitive, commoditised sectors.
Nigerian Example: Flour Mills of Nigeria operates in a thin-margin business: milling is competitive and input costs (wheat prices, FX) are volatile. A net margin of 3–5% is typical. Contrast this with a pharmaceutical company or a bank, where margins can be 20–30%+. Neither is 'bad', but you must compare within sectors.
Healthy Range: Compare to sector averages. For FMCG companies: 5–15%. For banks: 20–35%. For manufacturing: 5–12%. The key is consistency and direction, stable or growing margins over 3–5 years.
Red Flag: Rapidly shrinking margins in a business that has not changed significantly. This often signals rising input costs, pricing pressure from competitors, or management inefficiency. If revenue grows but margins shrink, the company is growing unprofitably.
Free Cash Flow (FCF) Formula: FCF = Operating Cash Flow − Capital Expenditure What It Tells You: Free Cash Flow is arguably the most important metric that most retail investors ignore. It tells you how much real cash the business generates after maintaining and growing its asset base. Profits can be inflated through accounting choices. Cash cannot be faked. A business with strong FCF has money to pay dividends, reduce debt, fund acquisitions, or buy back shares.
Nigerian Example: A company reports ₦10 billion in net profit is impressive on paper. But its FCF is negative ₦2 billion because it spent heavily on machinery and infrastructure. That profit exists on paper but is not in the bank. Conversely, a company with ₦7 billion net profit and ₦9 billion FCF is generating more real cash than its accounting profit shows, a sign of quality.
Healthy Range: Positive and growing FCF over 3–5 years is ideal. FCF yield (FCF ÷ Market Cap) above 5–8% is generally attractive. Compare FCF to reported net profit, if FCF is consistently higher, the company's profits are high quality.
Red Flag: Persistent negative FCF is not automatically bad for growth-stage companies that are investing in expansion. But for mature companies with declining revenue, negative FCF signals the business is burning cash. Also watch for companies that generate positive FCF but fund it by stretching payables (delaying payments to suppliers): unsustainable.
Quick Reference: All Metrics at a Glance
Metric | What It Measures | Healthy Signal | Red Flag |
EPS | Profit per share | Growing YoY 10%+ | Declining 2+ years in a row |
P/E Ratio | Price vs earnings | Below sector average with strong growth | Very high P/E with slowing earnings |
P/B Ratio | Price vs net assets | Below 1.0x + strong ROE = potential bargain | Below 1.0x + declining ROE = value trap |
ROE | Management efficiency | 15%+ sustained over 3–5 years | High ROE from high debt, not operations |
Dividend Yield | Cash income return | 5–12% for NGX income stocks | Above 20% may signal price crash |
Payout Ratio | % earnings paid as dividend | 40–70% for mature companies | Above 100% — dividend unsustainable |
D/E Ratio | Debt vs equity | Below 1.5x for non-financials | Above 3.0x in high-rate environment |
Revenue Growth | Business expansion | Above inflation rate, ideally 10%+ | Declining revenue two or more years |
Net Profit Margin | Operational efficiency | Stable/growing vs sector peers | Shrinking margins despite revenue growth |
Free Cash Flow | Real cash generation | Positive and growing | Persistently negative in mature company |
KEY INSIGHT No single metric tells the whole story. The best investors read metrics together like puzzle pieces. A low P/E is only a buy signal if ROE is healthy, debt is manageable, and revenue is growing. Build the full picture before you act.
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