Before You Start
- Basic understanding of ETFs and investment risk
- Access to a European brokerage account (e.g., Trade Republic, DEGIRO, Scalable Capital)
- Ability to verify ETF factsheets and KIDs (Key Information Documents)
- Comfortable reading ETF performance charts and understanding EUR-based returns
Time needed: About 60–90 minutes for initial setup and research
What you'll need: Internet access, identity documents for broker registration, a list of themes you’re interested in, and a calculator (digital or physical)
Thematic ETFs let you invest directly in trends shaping the next decade—think artificial intelligence, green energy, or robotics. But with so many options, how do you choose the right funds, avoid costly mistakes, and build a resilient, future-focused portfolio as a European investor? This step-by-step guide will walk you through how to invest in thematic ETFs in Europe, with a clear focus on selection, performance analysis, risks, and integration into your EUR-based strategy.
As we covered in our Complete 2026 Guide to Building a Low-Cost European ETF Portfolio, thematic ETFs are a powerful but specialized tool. This article dives deeper, focusing specifically on how you can analyze, select, and implement thematic ETFs to capture long-term opportunities—without neglecting diversification or cost control.
Step 1: Understand What Thematic ETFs Are (and Why They’re Different)
What to do: Clarify the difference between broad-market and thematic ETFs. Thematic ETFs focus on a specific trend or sector (like clean energy, cybersecurity, or healthcare innovation), rather than tracking a whole market index.
- Examples: iShares Global Clean Energy UCITS ETF (INRG), L&G Artificial Intelligence UCITS ETF (AIAI), HAN-GINS Robotics & Automation UCITS ETF (ROBO)
Why it matters: Thematic ETFs offer higher growth potential if their theme thrives, but also higher risk if the theme underperforms or fades. Unlike broad ETFs (like MSCI World or VWCE), they can be much more volatile and less diversified.
What can go wrong: Many investors confuse thematic ETFs with sector ETFs or assume they’re “safe” because they’re diversified. In reality, themes can be narrow, cyclical, or subject to hype. If the trend fizzles, so can your returns.
Pro Tip
Always check the top 10 holdings in a thematic ETF. If more than 30% of assets are in just a few companies, the fund may be riskier than it appears.
Step 2: Define Your Investment Theme (and Test Its Longevity)
What to do: Make a list of trends you believe in for the next 5–20 years (e.g., AI, renewable energy, digital health, space exploration). Research whether there are investable ETFs tracking these themes and how long those ETFs have existed.
- Use tools like justETF or your broker’s ETF screener (e.g., in Trade Republic or DEGIRO) to search for “theme” or “sector” ETFs.
Why it matters: Thematic investing is only as strong as the underlying trend. A theme with real, persistent drivers (e.g., decarbonization) is more likely to produce sustained returns than a fad (e.g., metaverse hype in 2022).
What can go wrong: Chasing themes based on recent performance or media buzz often leads to buying high and selling low. Some thematic ETFs have short track records or are based on poorly defined trends.
Pro Tip
Look for themes supported by structural change (regulation, demographics, technology) rather than just short-term headlines.
Step 3: Screen for European-Accessible, EUR-Denominated UCITS ETFs
What to do: Filter your theme list for ETFs that are:
- UCITS-compliant (crucial for European tax and regulatory reasons)
- Available in EUR (either EUR-denominated or at least tradable in EUR on your broker)
- Listed on European exchanges (e.g., Xetra, Euronext, Borsa Italiana, SIX Swiss)
Why it matters: UCITS ETFs offer investor protection, tax advantages, and are widely available across Europe. EUR listings simplify currency risk and make tracking your returns easier.
What can go wrong: Some popular thematic ETFs (e.g., US-domiciled ARK funds) are not UCITS-compliant and may not be accessible or tax-efficient for Europeans.
- Example: INRG (iShares Global Clean Energy UCITS ETF) is EUR-denominated and available on Xetra, making it suitable for most European investors.
- Example: AIAI (L&G Artificial Intelligence UCITS ETF) is UCITS-compliant and trades in EUR on various platforms.
Pro Tip
In DEGIRO, search for ETFs under “Trackers” → filter by “UCITS” and “EUR” to find compliant, euro-based funds.
Step 4: Analyze Fees, Performance, and Holdings
What to do: For each ETF, review:
- Ongoing charges (TER): Thematic ETFs often have higher fees (0.40%–0.85% per year typical)
- Past performance: Look at 1-year, 3-year, and since-inception returns (in EUR)
- Top holdings and diversification: Check if the fund is concentrated in a few stocks or countries
- Fund size and liquidity: Prefer ETFs with at least €100 million in assets and strong daily trading volume
Why it matters: Fees eat into returns, and small, illiquid ETFs can be hard to trade or even at risk of closure. Past performance doesn’t guarantee future results, but a longer track record is a good sign.
What can go wrong: High fees can erode gains, especially if the theme underperforms. Illiquid funds can have wide bid-ask spreads and may be delisted.
- Example: INRG (TER 0.65%, 3-year EUR return: ~9% p.a.), AIAI (TER 0.49%, 3-year EUR return: ~12% p.a. as of early 2026)
Pro Tip
Compare the thematic ETF’s performance to a broad-market ETF like VWCE or IWDA to see if you’re being rewarded for the extra risk. See our analysis: IWDA vs. CSPX: Which European UCITS ETF Is Better for Long-Term Investors?
Step 5: Decide on Allocation (and Diversification)
What to do: Limit thematic ETFs to a sensible slice of your portfolio. Most experts recommend no more than 10–20% in total thematic exposure, with the rest in broad-market ETFs and/or bonds.
- Example allocation for a €10,000 portfolio:
- €7,500 in MSCI World or VWCE (broad global exposure)
- €1,500 in thematic ETFs (e.g., €750 in clean energy, €750 in AI)
- €1,000 in EUR-denominated bond ETF for stability
Why it matters: Thematic ETFs can boost returns if you’re right about the trend, but concentrated bets can also drag down your overall performance.
What can go wrong: Overweighting thematic funds can turn a diversified portfolio into a high-risk gamble. If a theme crashes, you risk permanent capital loss.
Pro Tip
Use a compound interest calculator to forecast the impact of different allocations and expected returns.
Step 6: Choose and Use a EUR-Focused European Broker
What to do: Register with a broker that offers EUR accounts, low ETF trading fees, and access to major European exchanges. Popular options include:
- Trade Republic (Germany, low fees, easy interface)
- DEGIRO (Netherlands, wide selection, low commissions)
- Scalable Capital (Germany, free ETF savings plans)
Why it matters: Not all brokers offer the same thematic ETFs or EUR-denominated listings. Some charge high FX or custody fees.
What can go wrong: Using a broker with high foreign exchange fees or limited ETF access can eat into your returns or make rebalancing difficult.
- Example: In Trade Republic, tap Portfolio → Savings Plan → Select ETF. Search for “AI” or “clean energy”, select your UCITS ETF, and set your monthly investment amount in EUR.
- Example: In DEGIRO, use the “Trackers” tab, filter by “Theme” and “UCITS”, then place a buy order for your chosen ETF in EUR.
Pro Tip
Some brokers (like Scalable Capital) offer free ETF savings plans (“Sparplan”) for selected funds, reducing your costs over time.
Step 7: Monitor, Rebalance, and Stay Objective
What to do: Review your thematic ETF performance at least twice a year. Compare against your original thesis and against broad-market ETFs.
- Rebalance if your thematic allocation drifts above your target (e.g., if a theme outperforms and grows to 25% of your portfolio, consider trimming).
- Be prepared to exit if the theme’s fundamentals deteriorate or the ETF closes.
Why it matters: Thematic ETFs can experience rapid booms and busts. Regular check-ins prevent your portfolio from drifting into unintended risk.
What can go wrong: Neglecting to rebalance can lead to overweight positions. Emotional attachment to a theme can cause you to hold losers too long.
For more on portfolio maintenance, see The Smart Way to Rebalance Your ETF Portfolio: How Often and When?
Common Mistakes When Investing in Thematic ETFs
- Chasing hype: Buying after a theme has already soared, only to suffer losses when sentiment turns.
- Ignoring diversification: Allocating too much to one theme or neglecting broad-market ETFs.
- Overlooking fees: Focusing on performance, not realizing high TERs can erode long-term returns.
- Choosing non-UCITS ETFs: Accidentally buying US-domiciled funds, leading to tax issues or inaccessibility.
- Using the wrong broker: Paying unnecessary FX fees or missing out on savings plans.
Next Steps
- Start by reviewing your current ETF portfolio to see if you’re missing out on future-focused themes or are already overexposed.
- Research and shortlist 2–3 themes you believe in for the next decade. Use the steps above to identify suitable UCITS ETFs and assess fees, holdings, and track record.
- Open or optimize your brokerage account to ensure you can buy EUR-denominated, UCITS-compliant thematic ETFs cost-effectively.
- Test your allocation plan with a small investment (e.g., €100–€500) before committing more capital.
- For a broader perspective on portfolio construction, see our Complete 2026 Guide to Building a Low-Cost European ETF Portfolio.
- Want to optimize small regular investments? Read How to Start Investing With Just €50 per Month in 2026: Best Strategies for Small Budgets.
Disclaimer: This article is for educational purposes only and does not constitute financial advice. Always do your own research and consider consulting a qualified financial advisor before making investment decisions.