Portfolio a alokace
When to Simplify a Portfolio and When to Add a Component
Key takeaways
- Adding a new component only makes sense if it reduces correlation or fulfils a specific function that existing components don't cover.
- Unnecessary complexity increases transaction costs, makes rebalancing harder, and leads to impulsive changes.
- One or two global ETFs cover thousands of companies — adding a third "just to be safe" typically diversifies nothing.
- Simplifying a portfolio makes sense if you don't understand it, can't keep up with monitoring it, or it has stopped serving its original purpose.
A more complex portfolio is not automatically better — every new component should serve a concrete purpose and bring diversification that isn't already there.
When to Add a New Component
Adding a new asset makes sense if it meets at least one of these criteria:
- Low correlation with the existing portfolio — the asset moves differently, reducing overall volatility.
- Specific function — bonds for stability, REITs for real estate exposure, EM ETF for a deliberate overweight of emerging markets.
- Tax or legal reason — e.g. separating a short-term reserve from the long-term portfolio.
Adding a component just because you read about it or it seems interesting is a bad reason. Portfolios grow by adding new ETFs, but they stay functional through restraint.
When to Simplify
It's time to simplify a portfolio if:
- you don't understand why a specific component is there;
- rebalancing is so complex that you keep putting it off;
- you have 8+ ETFs and their holdings overlap (the same stocks in different funds);
- the portfolio was built by buying "whatever seemed good" without an overall plan.
Practical Simplification Process
Don't simplify all at once — selling everything would be a tax disaster. Stop adding to the components you want to wind down, and direct new contributions towards your simplified intent. The portfolio will gradually shift naturally. More on the tax perspective in rebalancing without taxes. What belongs in a portfolio is explained in the first portfolio guide.
FAQ
How many ETFs is the optimal number in a portfolio?
For most investors, 1–3 ETFs is fully sufficient. One global equity ETF covers thousands of companies. Adding a bond ETF or EM component makes sense with a specific purpose. More than 5 ETFs is generally unnecessary complexity for a retail investor.
How do I know if my portfolio is too complex?
If you can't quickly explain why each component is there, or you keep putting off rebalancing because of the complexity — it's time to simplify. Unnecessary complexity increases error rates and reduces consistency.
Is diversification across more ETFs better?
It depends on correlation. If new ETFs hold similar stocks to existing ones, the diversification is illusory. Real diversification comes from low correlations — geographic, sectoral, or by asset class.