Risk management is the difference between investors who stick with it and investors who give up. It is not about winning every trade. It is about keeping your losses manageable, so you can come back tomorrow if today goes badly.
The two basic rules
Successful investing comes down to two rules:
- Rule 1: Use a system that is correct in at least two out of three cases. Not every trade needs to be profitable, but the majority should be.
- Rule 2: Never risk more than 5% of your available capital on a single investment idea. Many professionals even work with 2 to 3%.
Of these two, rule 2 is the most important. You can have an excellent system, but if you risk too much on a single position, a series of losses can wipe you out. Conversely, with good risk management you can survive even a less accurate system.
Determining position size
The 5% rule translates directly to your position size. If you have 10,000 euros available for investing, you risk a maximum of 500 euros per trade. That does not mean you invest a maximum of 500 euros, but that you can lose a maximum of 500 euros if the trade goes against you.
How to calculate this:
- Determine your entry price
- Determine your stop-loss level
- The difference between entry and stop-loss multiplied by the number of shares must not exceed 5% of your capital
If your entry price is 50 euros and your stop-loss is at 45 euros, you risk 5 euros per share. With a maximum risk of 500 euros, you can therefore buy 100 shares (a position size of 5,000 euros).
Emotion is the enemy
The two strongest emotions in investing are fear and greed. With fear, you sell too early or do not dare to enter. With greed, you hold on too long or take positions that are too large.
The remarkable thing is that the majority of investors are most bullish at the top and most bearish at the bottom. They buy when they are euphoric and sell when they are afraid. That is exactly the opposite of what works.
The solution is not to suppress emotions, but to follow a system that makes emotions irrelevant. If you determine in advance when you enter, when you exit, and how much you risk, you no longer need to make a decision in the moment.
Investing as a business
The best way to think about investing is as a small business. A business has a plan, keeps costs low, ensures decent margins and repeats what works. An investor who does the same outperforms 90% of the market.
In practical terms, this means:
- Have a written plan with clear rules for entry, exit and position size
- Keep a journal of all your trades, including the reason why you took them
- Evaluate periodically: which setups worked, which did not, and why?
- Adjust your plan based on data, not on feeling
The three independent studies
A solid risk approach requires confirmation from multiple sources. Only take a position when at least three unrelated analyses agree. For example:
- Price: the price structure shows a clear trend or pattern
- Volume: the volume confirms the movement (rising volume on a breakout, declining on a pullback)
- Momentum: an indicator such as RSI or MACD confirms the direction
If only one or two of the three are positive, you wait. Patience is one of the most underrated skills in investing. Most of the time, you should be doing nothing.
Common mistakes
- Taking positions that are too large. If a loss keeps you awake at night, your position is too large.
- Not using a stop-loss. Without a predetermined loss ceiling, a small setback can grow into a major problem.
- Relaxing risk parameters in good times. In a bull market, investors forget their rules. Until the market turns.
- Following someone else's opinion. Your plan should fit you, not someone else. If you take a trade because someone else says so, you do not have a plan but a gamble.
Risk management sounds defensive and boring. But it is what separates professional investors from amateurs. The best investors do not win more often. They lose less when they lose. That is the whole secret.