ETF essentials ยท 2 minute read
Can you own too many ETFs?
The short answer
Yes. Adding ETFs can improve diversification, but too many can create overlap, unnecessary cost and a portfolio that is difficult to understand or maintain.
Why it matters
Each ETF should have a clear role. Problems arise when several funds provide similar exposure under different names.
A portfolio with a global ETF, a US ETF, a technology ETF and an artificial-intelligence ETF may repeatedly hold the same large US companies. The investor has four funds, but not four independent sources of diversification.
More ETFs can also mean:
- More dealing and currency-conversion costs
- More factsheets and holdings to monitor
- More rebalancing decisions
- A less clear view of country, sector and company exposure
There is no correct number of ETFs for everyone. The useful test is whether each one adds a distinct function.
A simple example
An investor adds a fifth equity ETF because it has a different name. Portfolio analysis shows that eight of its ten largest holdings already appear in two existing funds.
This suggests possible overlap, but does not prove that concentration has increased. Check how much each fund invests in those companies, the rest of its holdings and how much of your portfolio you put in each ETF.
What to check
- What role does each ETF perform?
- Which holdings appear in several funds?
- What are the combined country and sector weights?
- Would one broader ETF provide similar exposure?
- Are the extra costs and monitoring justified?
Key term explained
Portfolio complexity is the additional work and uncertainty created by holding multiple investments, accounts or strategies.
The objective is not to own the greatest number of ETFs. It is to understand what the portfolio adds up to.