Let’s be blunt: most European investors chasing hot trends with thematic ETFs are bleeding money—and 2026 could be the year the hype finally bursts. If you think stuffing your portfolio with AI, clean tech, or “new energy” thematic ETFs will make you rich while you sip Aperol Spritz on Lake Como, think again. It’s time to rip off the blindfold and see thematic ETFs for what they are: a seductive but dangerous game—one that can work for a tiny minority, but will trap the rest.
This isn’t another “it depends” snooze-fest. The harsh reality is that most thematic ETFs in Europe have dramatically underperformed their vanilla index fund cousins. The thesis: by 2026, only a handful of European investors will beat the market with thematic ETFs—and for most, they are a tax-inefficient, overpriced trap. Still not convinced? Let’s dig in.
The Thematic ETF Boom: FOMO in a UCITS Wrapper
Europe has seen an explosion of thematic ETFs in the past three years. In 2023 alone, over 40 new thematic UCITS ETFs launched, targeting everything from artificial intelligence (think: Lyxor MSCI Robotics & AI UCITS ETF, ISIN: FR0010344893) to hydrogen economy plays (L&G Hydrogen Economy UCITS ETF, ISIN: IE00BMYDM794). Assets in European thematic ETFs hit a record €38 billion in late 2023 (Morningstar), up from just €13 billion in 2020.
“More money has flowed into European thematic ETFs since 2021 than the entire previous decade combined. Yet, most of these funds lag basic index trackers by double digits.”
If you’re feeling FOMO, you’re not alone. But here’s the kicker: the average European thematic ETF underperformed the MSCI Europe Index by over 13% per year between 2019 and 2023, according to Morningstar. While the S&P Europe 350 returned just under 8% annualized, popular thematic ETFs like iShares Digitalisation UCITS ETF (DGTL) returned a measly 2.5% annually—before fees and taxes.
Why Most Thematic ETFs Fail: The Numbers Don’t Lie
Let’s compare apples to apples, in EUR terms. If you invested €10,000 in a broad, low-cost Europe index ETF in 2019, you’d have roughly €14,700 by late 2023. Put that same €10,000 in a basket of thematic ETFs? You’d struggle to break €11,000. That’s not just underperformance—it’s wealth destruction once you account for inflation and fees.
- Expense ratios: Thematic ETFs in Europe average 0.60–0.75% per year, compared to 0.07–0.20% for core index UCITS ETFs (FT).
- Turnover and hidden taxes: Thematic ETFs churn their holdings more often, triggering hard-to-predict capital gains that eat into EUR returns, especially if you hold them outside tax-advantaged wrappers.
- Bubble risk: Remember the ARK Innovation ETF mania? European copycats like the HAN-GINS Tech Megatrend Equal Weight UCITS ETF launched in 2021—only to lose nearly 30% by 2023.
As we covered in our Ultimate Guide to European Index Funds (2026), boring, broad-based trackers win the long game. Thematic ETFs are the financial equivalent of betting on a single Eurovision contestant: glamorous, but most won't make it past the semi-finals.
The Bottom Line
For the vast majority of EUR-based investors, thematic ETFs are a distraction. They add complexity, cost, and risk—while delivering less than a core index tracker, year after year.
Who Should (and Shouldn’t) Use Thematic ETFs?
There’s a narrow slice of investors who might justify thematic ETFs:
- Speculators who actively trade and accept the risk of big losses.
- Sector insiders with genuine expertise—the crowd who understands semiconductors, not just the AI headline hype.
- “Play money” investors allocating a tiny percentage (think: under 5%) of their portfolio for fun or ideological bets.
But for everyone else? If you’re building EUR-denominated wealth for retirement, thematic ETFs are a siren song. Even the better ones—like L&G Clean Water UCITS ETF—have struggled to outpace a basic MSCI World ETF over any 5-year stretch. If you want to diversify beyond the big caps, you’re far better off with proven approaches (see our deep dive on European small-cap ETFs).
The Case For Thematic ETFs—And Why It’s Mostly Fantasy
Let’s steelman the optimist’s view. Thematic ETFs can offer rare outperformance—if you catch a new trend early and the theme isn’t already priced in. The AI boom of 2023-2024 saw some US and Swiss thematic funds (like WisdomTree Artificial Intelligence UCITS ETF) beat the MSCI World by 15% in a single year. Yes, that headline-grabbing return is possible… but sustaining it is another story.
The problem? By the time a theme goes mainstream enough for a major UCITS ETF launch, most gains have already been captured by active managers or private capital.
“For every 1 AI ETF that beats the index, 10 hydrogen or blockchain ETFs will quietly lag behind—sometimes by 20% or more in EUR terms.”
To be fair, a few thematic ETFs can add value as part of a more sophisticated, tactical allocation—especially for investors already maxing out their core index funds, who want to sprinkle a bit of spice. But make no mistake: this is not a path to outperformance for the average FIRE aspirant in Berlin or Barcelona.
2026: Smart Money Goes Back to Basics
Here’s my call: 2026 will be the year most European investors realize thematic ETFs are a transfer of wealth—from retail EUR accounts to ETF providers. The Warren Buffett approach—low-cost, diversified, tax-efficient index funds—will quietly demolish the “techno-theme” crowd, just as it did in the US in the 2010s.
Want more thematic exposure? Fine. Limit it to a tiny sliver of your portfolio. Build your core wealth with what works. Consider reading our guide to building a lazy EUR portfolio with just two ETFs if you’re serious about financial freedom—and tired of chasing fads.
“Thematic ETFs are here to stay—but for 95% of investors, they’ll be an expensive lesson. Don’t let 2026 be the year you pay for someone else’s marketing fantasy.”
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.