Baziloo Academy Level: Beginner ⏱ 4-minute read

Investor psychology: understanding your own pitfalls

By The Baziloo Editorial Team ·Published on 18 July 2026 at 3.45 pm

Investing in the stock market isn’t just about figures and strategies: your emotions play a major role. This article highlights common psychological pitfalls and explains how to recognise them so you can make better decisions.

🎯 What you’ll learn

Identify the emotions that influence your investment decisions
Recognising common psychological biases (fear, euphoria, impatience)
Understanding why investors make the same mistakes over and over again
Put safeguards in place to ensure you remain rational

Why emotion is your greatest enemy on the stock market

When you invest, two forces clash in your mind: reason and emotion. Reason tells you to buy a cheap share with good prospects. Emotion, on the other hand, screams at you to sell in a panic when the price falls, or to rush to buy when everyone else is getting rich.

These emotional reactions are natural. They stem from ancient survival instincts. But on the stock market, they cost you money. Investors who let their emotions take the lead often sell at the worst possible time (when prices are low) and buy at the best possible time for others (when prices are already rising).

The problem? These mistakes keep happening. An investor who has panicked once will tend to panic again. It’s a cycle that’s difficult to break without realising what’s going on.

The four psychological traps you need to be aware of

The first trap is known as ‘fear of missing out’ (FOMO). You see your friends making money on a very popular share. You’re afraid of missing out on the opportunity, so you buy without thinking. The result: you buy when the price is already high, and you lose money when the price falls again.

The second pitfall is panic. Your portfolio (all your investments) drops by 10 %. You’re afraid of losing more. You sell everything straight away. But a few months later, prices rise again and you realise you sold at the worst possible time.

The third pitfall: emotional attachment. You bought a share at 50 €. It has fallen to 30 €. You refuse to sell it because you are waiting for it to rise back to 50 € so you can ‘get your money back’. Meanwhile, that money could be invested elsewhere and generate a return for you.

The fourth pitfall is overconfidence. After a few good results, you start to think you’re invincible. You take excessive risks or invest without doing your research. This is often followed by a sharp decline.

How to recognise and manage your emotions

The first step is awareness. Before every decision to buy or sell, ask yourself this question: ‘Am I making this decision based on reason or emotion?’ If you feel rushed, panicked or overexcited, that’s a warning sign.

Next, set some simple rules before you invest. For example: ‘I will never sell in a panic. If I want to sell, I’ll wait 48 hours and reassess.’ These rules help you stay rational when emotions take over.

Finally, diversify your portfolio (invest in several different shares or sectors). This reduces emotional stress. If one share falls, others may rise, and you won’t feel as though you’re in immediate danger.

The role of discipline and planning

The best investors do not make day-to-day decisions. They have a written plan before they start. This plan states: ‘I am going to invest 200 € per month for 10 years. I will only review my portfolio every quarter.’

With a plan, you’re not tempted to react to every little market fluctuation. You already know what you’re going to do. It’s like an autopilot for your emotions.

📖 Definitions

Portfolio: A summary of all your investments (shares, bonds, etc.) in one place.
FOMO (Fear of Missing Out): The fear of missing out. You buy in a hurry because you’re afraid the price will go up without you.
Psychological bias: A natural tendency of your brain to make irrational decisions, often repeatedly.
Diversify: Invest in a range of different shares or sectors to reduce risk.
Market panic: A moment when many investors sell at the same time out of fear, causing prices to fall rapidly.

💡 A practical example

A practical example: You buy a share at 100 €. Two weeks later, the price falls to 80 €. You panic and sell it immediately to ‘limit the damage’. Three months later, the share price rises to 120 €. You have lost 40 € per share because of your panic. If you had waited, you would have made 20 € per share.

⚠️ Risks you need to be aware of

Emotions can lead you to sell at the worst possible time and buy at the best possible time for others
The fear of missing out (FOMO) drives you to make impulse purchases, often when it’s too late
Emotional attachment to a trade prevents you from cutting your losses
Overconfidence following a few wins can lead you to take excessive risks
Without a written plan, you are more vulnerable to psychological traps

✅ Key points to remember

Your emotions (fear, euphoria, impatience) are your greatest enemies on the stock market
Recognising the fear of failure, panic, emotional attachment and overconfidence helps you to avoid them
Draw up a written investment plan and stick to it, even when your emotions tempt you to change it
Wait 48 hours before selling in a panic: it’s often a good decision
Diversification reduces emotional stress by limiting the impact of a single share falling in value

🧠 Test your knowledge

1. You notice that everyone is buying a very popular share. You’re afraid of missing out. What psychological trap is this?

2. Your share price has fallen by 15 %. You’re worried about losing more. What should you do, according to this article?

Fancy taking it a step further?

Analysise this security in detail on Baziloo — B-Score, risk metrics, price history — and track it in your portfolio.

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Sources

AMF — Investor Zone (Autorité des marchés financiers) — amf-france.org