When a company reports results, the headline usually focuses on revenue and profit. Yet one of the most revealing numbers sits just below revenue: gross margin. It shows how much money a business keeps from each pound of sales after paying the direct cost of making what it sells, and it often explains share price moves that the headline numbers do not.
The basic calculation
Gross profit is revenue minus cost of goods sold. Cost of goods sold covers the direct costs of producing goods or services: raw materials, factory labour, components and, for some firms, shipping. Gross margin is gross profit divided by revenue, shown as a percentage.
If a company sells £100 million of products and spends £60 million making them, gross profit is £40 million and gross margin is 40%. That 40% must then pay for everything else: marketing, research, head office, interest and so on.
What a high or low margin means
Gross margins vary hugely by industry. Firms selling downloadable programs often report margins above 70%, because selling one more licence costs almost nothing. Supermarkets usually run margins in the low 20s or below, since they resell goods made by others in a fiercely competitive market. Carmakers and airlines tend to sit somewhere in between.
So a 25% margin is not good or bad on its own. What matters is how it compares with direct rivals and with the company’s own history. A business with a much higher margin than its peers may have pricing power, a strong brand or a cost advantage.
Why traders watch the trend
The direction of gross margin often matters more than its level. A rising margin suggests the company can push through price increases or is getting more efficient. A falling margin may signal discounting, rising input costs or tougher competition.
Markets react sharply to surprises here. A retailer can beat revenue forecasts and still see its shares fall if margins come in lower than expected, because investors read it as growth bought with discounts. Chipmakers are a good example of margin sensitivity: when memory prices fall, their margins can swing by tens of percentage points within a year.
Gross margin versus other margins
Gross margin is the first of several profit margins. Operating margin goes further, subtracting overheads such as salaries, research and marketing. Net margin is what is left after interest and corporation charges. EBITDA is another popular measure that strips out depreciation and amortisation.
Looking at all of them together shows where a business makes or loses money. A firm with a strong gross margin but a weak operating margin may be spending too much on overheads. A firm with a thin gross margin has little room for error anywhere.
Traps to avoid
Accounting choices can shift costs between cost of goods sold and operating expenses, so comparisons between companies are not always like for like. Some firms highlight an “adjusted” gross margin that leaves out certain costs. One-off items, such as a writedown of unsold stock, can distort a single quarter.
Currency moves matter too. A UK company that buys inputs in dollars and sells in pounds can see margins squeezed when sterling weakens, even if nothing else changes.
How to use it
When reading an earnings report, check gross margin against the same quarter a year earlier, against analyst expectations and against the company’s guidance. Listen for what management says about pricing, input costs and product mix. Those comments often explain the market’s reaction better than the headline profit figure.
Our view is that gross margin is one of the most useful early warnings in company results, because it reflects pricing power before overheads blur the picture. A steady or rising margin in a tough market is a sign of quality; a falling one in a strong market deserves questions. What would change that read is clear evidence that a margin dip is temporary, such as a one-off cost spike. If you want a clearer picture of how you analyse companies and manage risk, our free trader assessment is a useful next step.
