By Antonios Fotakis | July 2026
A note before you read: Profit margin is the metric that answers the question revenue growth never does – not how much a company is making, but how much of what it makes it actually keeps. It’s one of the clearest windows into the health, efficiency, and competitive strength of any business.
What is profit margin. Let me ask you something.
Imagine two restaurants on the same street. Both bring in €500,000 in revenue every year.
The first has high rent, an expensive kitchen team, premium ingredients, and significant marketing costs. After everything is paid, it keeps €25,000. That’s €25,000 out of €500,000 – 5 cents for every euro that comes through the door.
The second runs a tighter operation – a smaller space, a focused menu, lower overhead. After everything is paid, it keeps €100,000. That’s 20 cents for every euro.
Same revenue. The second restaurant is four times more profitable.
Profit margin is that ratio – what a company keeps from every euro it earns. And it reveals something about a business that revenue, EPS, and growth rates simply cannot: how efficiently it converts sales into actual money.
So What Is Profit Margin, Exactly?
Profit margin is the percentage of revenue that remains as profit after costs are subtracted.
The core formula: Profit Margin = Net Profit ÷ Revenue × 100
If a company earns €200 million in revenue and keeps €30 million after all costs, its profit margin is 15%. For every €100 of sales, €15 becomes profit.
But profit margin is not a single number – it comes in three layers, each revealing a different level of the business. Understanding which one you’re looking at changes what the metric tells you.
The Three Layers of Profit Margin
Gross Profit Margin is the first and most basic layer. It measures what remains after subtracting only the direct costs of producing goods or services – materials, manufacturing, direct labour. Everything else – rent, salaries, marketing, taxes, interest – has not yet been subtracted.
Gross Margin = (Revenue − Cost of Goods Sold) ÷ Revenue × 100
Gross margin tells you how efficiently a company produces what it sells. A high gross margin means the product itself is highly profitable before overhead is considered. Software companies often have gross margins above 70% because the cost of delivering additional software is nearly zero. Supermarkets operate on gross margins of 25-30% because they’re selling physical goods with real production costs.
Operating Profit Margin goes one layer deeper – subtracting operating expenses like salaries, rent, and marketing on top of production costs, but before interest and taxes.
Operating Margin = Operating Profit ÷ Revenue × 100
Operating margin reveals how efficiently the entire business operation runs – not just the product, but the whole organisation behind it. A company with high gross margins but low operating margins is spending heavily on overhead relative to what it earns – a sign of inefficiency, aggressive growth investment, or both.
Net Profit Margin is the bottom line – what remains after everything has been subtracted, including interest payments on debt and taxes.
Net Margin = Net Profit ÷ Revenue × 100
This is the number most commonly referred to simply as “profit margin” – and it’s the one that tells you, ultimately, how much of every euro in sales the company’s shareholders actually benefit from.
Gross margin tells you about the product. Operating margin tells you about the business. Net margin tells you about the outcome.
What Is a Good Profit Margin?
As with every metric in this series, the answer depends almost entirely on the sector.
| Sector | Typical Net Profit Margin |
|---|---|
| Software / SaaS | 20–35%+ |
| Pharmaceuticals | 15–25% |
| Financial services | 15–30% |
| Consumer goods | 8–15% |
| Retail | 2–8% |
| Supermarkets / Grocery | 1–4% |
| Airlines | 1–5% (highly variable) |
A 3% net margin in grocery retail is not a failing business – it’s the structural reality of an industry with thin margins, high volume, and significant infrastructure costs. A 3% net margin in a software company is a serious red flag.
Comparing profit margins across sectors is almost meaningless. Comparing within the same sector tells you a great deal.
Want to understand how to evaluate margins alongside other financial metrics when building a real investment case? Get the complete Stocks Explained guide here.
Why Profit Margin Is One of the Best Signals of Competitive Advantage
Here is what makes profit margin more than just an efficiency metric – and why investors like Warren Buffett consider it one of the most important indicators of business quality.
A company with consistently high profit margins – sustained over many years, through economic cycles and competitive pressure – is almost always protected by something that competitors cannot easily replicate. A brand. A patent. A network effect. A cost structure that took decades to build. What economists call a competitive moat.
Think about it from the other direction: if a company is earning 25% net margins in a competitive industry, why aren’t competitors flooding in to take a piece of that profit? The answer is that something is stopping them. And that something – whatever it is – is the most valuable asset the company has, even if it doesn’t appear directly on the balance sheet.
High, sustained profit margins are the fingerprint of a durable competitive advantage. Low or deteriorating margins are the fingerprint of a business under pressure.
This is why margin trends matter as much as margin levels. A company with declining margins year after year – even from a high starting point – may be signalling that its competitive position is eroding. A company with low but improving margins may be building scale and efficiency that will eventually translate into significant profitability.
Profit Margin and Revenue Growth Together – The Complete Picture
In the revenue growth article, we made the point that growing the top line doesn’t automatically mean growing the bottom line. Profit margin is exactly the metric that confirms or contradicts that.
The combination you’re looking for:
Growing revenue + expanding margins = high quality growth. The company is selling more and keeping a larger percentage of each sale. This is the most powerful combination in investing – it means the business is scaling efficiently, gaining competitive leverage, and converting growth into compounding shareholder value.
Growing revenue + shrinking margins = concerning growth. The company is selling more but keeping less of each sale. This can happen for legitimate reasons – heavy investment in future capacity, pricing pressure from competition, or deliberate market share expansion. But it requires a credible explanation, because it means growth is coming at a cost.
Shrinking revenue + expanding margins = restructuring. The company may be cutting unprofitable business lines, improving efficiency, or pivoting toward higher-quality revenue. Not automatically bad – but requires understanding what’s driving the contraction.
Shrinking revenue + shrinking margins = serious concern. Both the top line and the efficiency are deteriorating simultaneously. This demands significant scrutiny before any investment consideration.
Together with EPS and revenue growth, profit margin completes the profitability picture that no single number in a stock screener can give you alone.
How Profit Margin Fits Into Our Three Categories
Profit margin plays a different role across each of the three AF Core Global philosophies.
In Fortress, individual company margins matter less than the aggregate profitability of the broad ETF or index fund we hold. What we watch at a macro level is whether corporate profit margins across the market are expanding or contracting – because sustained margin compression across the economy tends to precede earnings pressure that eventually affects index returns.
In Cash Flow, stable and healthy profit margins are a key supporting condition for dividend reliability. A company paying consistent dividends while operating on thin or declining margins is in a fragile position – one difficult quarter can force a choice between servicing debt, investing in the business, and maintaining the dividend. The companies with the most reliable long-term dividend records almost always operate with comfortable, stable margins.
In High Voltage, we often look at gross margin as the primary signal in earlier-stage companies – because net margin can be negative during aggressive growth phases, but gross margin tells you whether the underlying unit economics are sound. A company with 70% gross margins losing money at the net level is a very different risk from one with 30% gross margins doing the same – because the first has a credible path to profitability as it scales, and the second may not.
The number is the same. The question you ask of it changes with the context.
Not blind trust. Informed choice.
What to Look For When You See Profit Margin on a Screener
When profit margin appears in your research, work through this sequence:
Which margin are you looking at? Gross, operating, or net – they tell you different things. Make sure you know which layer you’re examining.
How does it compare to the sector average? A margin that looks low in isolation may be strong within the industry – and vice versa. Context is everything.
Is it trending up, flat, or down over 3–5 years? The direction of the margin trend is often more informative than the current level. Expanding margins signal improving efficiency or strengthening competitive position. Contracting margins signal the opposite.
Does the revenue growth story make sense alongside the margin story? High revenue growth with expanding margins is the ideal. Any other combination deserves a deeper question.
For high-growth companies, is gross margin healthy even if net margin is negative? This is the key question for earlier-stage businesses where profitability is still being built.
For a complete guide to evaluating company profitability and financial performance when building a real investment case, our Stocks Explained guide is the place to start. 👉 Get the Stocks Explained Guide Here
Nothing in this article constitutes financial advice. All content is for informational and educational purposes only. Always do your own research before making any investment decision.
