Let’s cut through the noise: Most European ETF investors are sabotaging their own returns by buying too many funds with the same exposure, bleeding money on unnecessary fees and missing out on actual performance. The cult of diversification has gone too far in Europe, turning smart risk management into a costly, index-hugging farce.
Here’s the uncomfortable truth: ETF over-diversification in Europe is not just harmless; it’s damaging. Piling up every UCITS ETF you can find doesn’t reduce risk — it multiplies costs, muddies performance, and hands your hard-earned euros to fund providers. It’s time to stop worshipping at the altar of “more is better.”
The High Price of Overlap: Hidden Fees and Lost Returns
If you think owning 10, 15, or even 20 ETFs makes you safer, think again. The numbers don’t lie. According to Morningstar, the average European investor holds 8-12 ETFs. Sounds prudent, right? But drill down and you’ll see rampant overlap: iShares Core MSCI World UCITS ETF (EUNL) and Xtrackers MSCI World UCITS ETF (XDWD)? Nearly identical. Add in the SPDR MSCI ACWI IMI UCITS ETF (SPYI) and you’re covering the same ground, but paying three times for the privilege.
In a 2023 analysis of 100 EUR-based portfolios, over 70% of holdings in World, S&P 500, and Europe ETFs were duplicated — with investors paying a blended TER of 0.27% instead of the 0.12% they’d get with a single, broad ETF.
That 0.15% difference may seem trivial. It’s not. On a €100,000 portfolio over 20 years, that’s a €3,000+ performance drag — for absolutely zero added diversification. And if you’ve strayed into “thematic” ETFs, expect worse. The FT reported that thematic ETFs in Europe charge an average TER of 0.54%, often tracking the same handful of US tech stocks already in your core funds.
Index Illusion: You’re Not as Diversified as You Think
Let’s get real: Most major ETFs marketed to Europeans are built on the same indices. The MSCI World, S&P 500, and FTSE All-World make up over 80% of AUM in the European ETF market. Yet investors keep buying “new” ETFs for a “diversified” look. Result? Massive overlap, especially in the top holdings. Apple, Microsoft, and Nestlé show up in almost every portfolio, often at double the intended weight.
A 2024 analysis by JustETF found that a typical multi-ETF European portfolio held 42% in overlapping stocks, killing the whole point of diversification.
This isn’t academic. In 2022, one German investor I reviewed held 6 ETFs claiming “broad global exposure.” His portfolio had 18% in Apple alone. He’d have done better holding a single low-cost World ETF — and saved €280/year in unnecessary TERs. If you want true global reach, do the work. Don’t just stack “World,” “Developed Markets,” and “ESG” ETFs: they’re tracking the same stocks in a different package.
The Headache of Complexity: More Funds, More Errors
With each extra ETF, you’re not diversifying risk — you’re multiplying mistakes. More funds mean more rebalancing, more bid-ask spreads, and more paperwork (hello, Belgian TOB or French tax headaches). Did you forget about currency risk? Many “hedged” or USD-listed ETFs add extra layers of cost, as we covered in The Real Cost of Currency Conversion for European ETF Investors. European investors love to tinker, but research from Vanguard Europe (2023) shows portfolios with more than 5 ETFs underperform simpler, more focused allocations by 0.4% per year, net of fees and slippage.
The Bottom Line
Over-diversification is the enemy of performance for European ETF holders — your portfolio’s true edge lies in precision, not pile-on.
To Be Fair: The Case for Some Diversification (and When It Makes Sense)
Let’s not pretend one ETF fits all. Want exposure to emerging markets, small caps, or specific ESG mandates? You’ll need to go beyond just iShares Core MSCI World and call it a day. But “some” isn’t “many.” The optimal count for most European investors? Three to six funds — max. Use a robust core-satellite strategy: a world/all-world ETF as your anchor (core), then 1-2 satellites for emerging markets, and maybe a thematic or sector tilt you truly believe in. Anything more and you’re probably deluding yourself — or just enriching BlackRock and Amundi.
For beginners, a three-ETF portfolio (World, EM, small-cap Europe) delivered 97% of the risk-adjusted return of much more complex portfolios between 2010-2024, according to BlackRock’s Eurozone study.
There are reasons to add more: tax optimization, filling a specific niche (like adding a UCITS-compliant bond ETF for your child, as detailed in this kids’ ETF portfolio guide). But the burden of proof is on complexity, not simplicity.
Portfolio Spring Cleaning: How to Fix Your ETF Mess
Ready to stop the madness? Start here:
- List all your ETFs and their underlying holdings — spot the obvious overlaps
- Calculate your true blended TER and ask if you’re paying extra for no extra return
- Consolidate! Drop redundant funds and focus on core exposures
- Check your true allocation by sector and geography: is your “global” portfolio just overweight US tech?
For more on passive income and streamlining, see how to earn €1,000 in ETF passive income annually as a European. If you’re still clinging to 12+ funds, ask yourself: are you diversifying, or just collecting ISINs?
The Future: Less Is More — Or You’ll Pay the Price
Here’s my call: As regulatory scrutiny and data transparency ramp up, the days of overlapping, bloated ETF portfolios are numbered. In five years, the best-performing European investors will run lean, focused portfolios with 3-5 core funds max — and leave the “ETF collectors” in the dust. Want outperformance? Stop paying for what you already own. Get ruthless. It’s your money. Act like it.
Disclaimer: This article reflects the author's opinion and is for educational purposes only. It does not constitute financial advice. Always do your own research before making investment decisions.