TL;DR: Moat investing means looking for companies with a durable competitive advantage, such as a strong brand, high switching costs for customers, network effects or a low cost position. You look at return on invested capital (ROIC) over several years and at the price you pay. A moat can weaken; the share price can fall sharply if expectations are wrong.
What can you expect?
- Time per week
- One to a few hours per week is enough to read and follow. Researching a new company thoroughly takes several hours to days.
- Starting capital
- You can start small, for example with fixed monthly amounts. For a diversified portfolio of individual shares, more capital helps. Use money you can do without for years.
- Typical setbacks
- Prices can fall for a long time, even for strong companies. Sometimes the moat proves weaker than expected or the price was too high. It can take years before good analysis shows, or it never does.
- Costs
- Order fees, spread, possibly currency costs, custody fees and tax (for Dutch individuals: wealth tax in box 3). Compare broker costs; with few transactions they stay limited.
- Not suitable if…
- Not suitable if you need money in the short term, do not want to read annual reports or get uneasy during sharp price falls.
How it works
An 'economic moat' is a durable advantage that lets a company defend its profitability longer than competitors. Warren Buffett used the image of a castle with a moat in his 1995 shareholder letter. Investment research firm Morningstar later popularised the term and classifies companies by the nature of their advantage. This page explains how investors look at it and what the limits are. A past advantage is no guarantee for the future, and even companies with a wide moat can be expensive or lose money. This is not advice.
Core principles
- 1. Look for a clear reason why competitors cannot easily copy the company
- 2. Look at several years of figures, not one peak year
- 3. Check whether the advantage is growing or eroding
- 4. Pay a price that allows for uncertainty; a good company can be a poor investment if you pay too much
Step-by- step plan
- 1
Describe the advantage in your own words
Write down what type of advantage the company would have and why competitors cannot easily copy it. If you cannot do that briefly and clearly, the moat is probably not clear enough.
- 2
Check the figures over several years
Look at at least five to ten years of margins, revenue and ROIC. Look for stability or improvement. Watch for one-off items that distort the picture.
- 3
Judge whether the advantage is growing or eroding
Look at technology, regulation and customer behaviour. Is the position stronger than five years ago? Is the company investing to keep its advantage?
- 4
Watch the price
Compare the valuation with its own history, competitors and expected growth. A strong company at too high a price can be a poor investment.
- 5
Diversify and review yearly
Keep the share of any one company limited and reassess the moat every year. Sell if the advantage structurally worsens, not on a temporary price drop.
In detail
What is an economic moat?
The term comes from the image of a castle with a moat: the moat keeps attackers at a distance. In his shareholder letter for 1995, Warren Buffett wrote that he looks for 'economic castles' protected by unbreachable moats.
In investing terms, a moat is an advantage that lets a company defend its profits against competitors for longer. Without such an advantage, high profits often disappear quickly, as others copy the model and push prices down.
Investment research firm Morningstar later popularised the term and gives companies a moat rating. It is an estimate, not a fact.
Commonly cited sources of a moat
Analysts often name five sources. Intangible assets: brands, patents, licences. Switching costs: customers find it hard to leave because it costs time, money or risk. Network effects: the product becomes more valuable as more people use it. Cost advantage: the company structurally produces or delivers more cheaply. Efficient scale: a market is so small that only a few players fit.
These are categories to think with, not a checklist. Even with a strong brand or network the advantage can disappear if customers change. Real-world examples are illustrative and not a recommendation.
Companies with several sources are usually better protected, but that is not certain either.
Figures that can reveal a moat
A moat must eventually show up in the numbers. Common clues are a high, stable ROIC (return on invested capital), stable profit margins and a stable or growing market share, over at least five to ten years.
You compare ROIC with the company's cost of capital. If it sits clearly above for years, the company creates value. A frequently quoted rule of thumb is 15%, but that is a guideline, not a law.
Past figures show what was. They do not say the advantage will remain. So also read the annual report on competition and risks.
Erosion and price: where it goes wrong
Moats can disappear. Photographic film, local newspapers and video rental shops held strong positions for years until technology undermined their model. An investor who looked only at the past was surprised.
Price also decides whether it is a good investment. A company with a wide moat can be expensive: you already pay a lot for future growth. If growth disappoints, the share price can fall sharply.
So build in a margin for setbacks and diversify. A moat lowers risk but does not remove it.
- Ability to read annual reports
- Long-term horizon
- Basic knowledge of valuation
- Annual reports and financial statements
- Stock screener or financial data provider
- Spreadsheet for ROIC and valuation
- 01 You can explain in your own words what the competitive advantage is and why it lasts
- 02 Return on invested capital (ROIC) has been clearly above the cost of capital for years
- 03 Margins and market share have been stable or improved in recent years
- 04 The price leaves room for setbacks (a 'margin of safety'), and the company fits your diversification
- 01 The competitive advantage demonstrably weakens, for example through new technology or regulation
- 02 Management destroys value through poor acquisitions or capital decisions
- 03 The valuation has become so high that further setbacks would hurt badly
- 04 You trim a holding because it has grown too large in your portfolio
Worked example
Hypothetical example (all amounts are assumed). Company X, amounts in millions of euros.
- Operating profit (EBIT): €160. Tax rate 25%
- NOPAT (profit after tax) = 160 x (1 - 0.25) = €120
- Invested capital = equity 500 + debt 200 - cash 100 = €600
- ROIC = NOPAT / invested capital = 120 / 600 = 20%
- Assumed cost of capital: 8%. Difference: 12 percentage points
On paper this company earns more than its cost of capital. Whether that lasts depends on the moat.
Price matters just as much: market value €1,800 + debt 200 - cash 100 = enterprise value (EV) €1,900. NOPAT / EV = 120 / 1,900 = 6.3%. That is what you 'earn' on the price you pay if things stay the same. If the company grows less than expected or the moat weakens, the share price can fall.
This calculation example shows the method. It says nothing about a real company or an expected return.
Hypothetical example, not advice.
Work it out yourself
Risks and risk management
- Moat erosion: technology or regulation can hollow out an advantage quickly
- Too high a price: even a strong company can be a disappointing investment if you overpay
- Hindsight bias: successful companies are easy to recognise afterwards
- Concentration in one sector, country or currency
- Diversify across several companies, sectors and types of advantage, or choose a diversified index fund
- Decide in advance how much of your wealth may sit in one share
- Reassess the moat at least yearly using annual reports
- Invest only money you can do without for a longer period
Learn the basics
Key takeaways
- A moat is a durable competitive advantage. It raises the odds of stable profits but guarantees nothing.
- Typical sources are intangible assets (brands, patents), switching costs, network effects and cost advantages.
- ROIC over several years is a useful tool, but not proof.
- Price matters: a strong company at too high a price can still disappoint.
Frequently asked questions
How do I know whether an advantage is truly durable? +
You cannot know for sure. Clues are a high ROIC over ten years or more, stable margins and a logical reason why competitors cannot copy it. Also ask which development could undermine the advantage, such as new technology or regulation.
Are there European companies with a moat? +
There are companies in Europe that analysts credit with a strong position, for example through high switching costs, brands or technology. Which ones changes over time and is an opinion. This site does not recommend individual shares. Do your own research or discuss it with an adviser.
When do you sell a moat stock? +
Commonly cited reasons: the moat demonstrably weakens, management destroys value, or the valuation is so high that a small setback costs a lot. Preferably do not sell out of emotion or because of a temporary price drop. Account for costs and tax.
Origin
Devised by / based on: Warren Buffett . Source: Berkshire Hathaway shareholder letter for 1995 ('economic castles protected by unbreachable moats'); term popularised by Morningstar