Your Portfolio Is Down — But Is It Really? How to Read Your Returns When the Euro Is Surging
When the euro strengthens against the dollar, your US stock portfolio can look like it's losing money even when it isn't. Learn how currency moves distort your real returns — and what to do about it.
You open your portfolio tracker on a Monday morning. Your US stocks are up in dollar terms — Apple gained 4%, Microsoft added 3%, the S&P 500 had a solid quarter. But your portfolio total, displayed in euros, is down 2%.
What happened?
The euro happened. More precisely: the euro strengthened against the dollar, and that move silently erased a chunk of your gains before you even noticed.
For European investors holding US-listed assets, this is one of the most common — and most misunderstood — sources of confusion. Your portfolio isn't lying to you. But you might be reading it wrong.
The Hidden Variable in Every Cross-Currency Return
When a European investor buys a US stock, two things are happening at once:
- You're buying exposure to that company's performance
- You're taking on exposure to the EUR/USD exchange rate
When you eventually sell (or when you look at your portfolio value today), both of those exposures combine to produce your actual return in euros.
The formula is simple:
EUR return = USD return × (EUR/USD at entry ÷ EUR/USD today)
Or more intuitively: if the dollar weakens relative to the euro, your dollar-denominated gains are worth fewer euros when converted back. If the dollar strengthens, your euro returns are amplified.
A Concrete Example
Say you invested €10,000 into a US index fund when the exchange rate was 1.05 (meaning €1 bought $1.05). You received roughly $10,500 worth of fund units.
Over the next twelve months, the fund rose 10% in dollar terms. Your $10,500 became $11,550.
But now the euro has strengthened to 1.15 (each euro now buys $1.15). When you convert your $11,550 back to euros: $11,550 ÷ 1.15 = €10,043.
Your portfolio is up just 0.4% in euros — even though the underlying investment gained 10% in dollars.
The currency move subtracted nearly 9.6 percentage points from your return.
Now reverse it. If the euro had weakened to 0.95 during that same period, your $11,550 ÷ 0.95 = €12,158. A 21.6% gain in euros — more than double the underlying USD performance.
The asset didn't change. The currency did everything.
Why the Euro Has Been Surging (and What It Means for You)
The euro has been strengthening against the dollar for much of 2025 and into 2026. A few forces are driving this:
US fiscal concerns. Rising US debt levels and political uncertainty around tariffs and trade policy have made the dollar less attractive as a safe-haven asset.
European rate dynamics. As the ECB navigated its own rate path, euro-denominated assets became relatively more appealing to global capital.
Dollar weakening as a deliberate policy signal. Some US policymakers have expressed a preference for a weaker dollar to support exports — a reversal from decades of "strong dollar" rhetoric.
For European investors, a stronger euro is a headwind on US holdings. Your dollars are worth fewer euros when you look at your portfolio. But it also means your euro-denominated expenses (rent, groceries, European stocks) are unchanged in real terms — you're not actually poorer. The loss is real only if you were planning to spend dollars.
How to Read Your Returns Correctly
There are three numbers every cross-currency investor should understand:
1. Local currency return. How did the asset actually perform in its home currency? This tells you about the investment quality — the company's fundamentals, sector momentum, market sentiment.
2. Currency contribution. How much did the EUR/USD move add or subtract from your return? This is a separate force, mostly outside your control as an individual investor.
3. Your total return in your base currency. The number that actually matters for your financial life — your returns expressed in euros, the currency you spend and save in.
Most portfolio trackers (including Folia) can show you all three if you look in the right place. The mistake most investors make is glancing at the top-line number, seeing it's negative, and concluding that their investment choices were wrong — when the asset itself may have performed just fine.
The Psychological Trap: Phantom Losses
Currency-driven drawdowns feel exactly like real losses. The number in your portfolio is lower than it was. But there's an important distinction:
A real loss means the underlying asset fell in value. The business deteriorated, the sector sold off, you made a bad call.
A currency loss means the exchange rate moved against you. The asset is fine. You're just holding dollars in a world that currently values them less relative to euros.
This distinction matters enormously for what you should do next.
If your portfolio is down because your stocks genuinely fell — that's information. Time to reassess, check your thesis, consider whether anything has changed.
If your portfolio is down purely because the euro strengthened — and your underlying holdings are flat or up in dollar terms — the rational response is usually: do nothing. The currency will move again. Panic-selling dollar assets at the moment euros are expensive is often exactly backwards.
Should You Hedge Currency Risk?
This is the natural follow-up question, and the honest answer is: it depends on your time horizon and your goals.
Currency hedging means taking a position that offsets your EUR/USD exposure — essentially locking in an exchange rate so that currency moves don't affect your returns. Many ETFs offer hedged versions (often labeled "EUR Hedged" or "H" in their ticker).
The case for hedging:
- Removes volatility from a force you have no insight into
- Makes your returns closer to the "pure" asset return
- Useful if you have a short time horizon or specific spending plans in euros
The case against hedging:
- Hedging costs money (typically 0.3–1% per year, reflecting interest rate differentials)
- Over long periods, currencies tend to mean-revert — short-term swings wash out
- If the dollar eventually strengthens again, unhedged investors benefit
- Complexity: hedged ETFs need to be rolled continuously
Most long-term investors — those with a 10+ year horizon — find that currency risk averages out and the hedging cost isn't worth it. Shorter-term investors or those closer to needing the money in euros have a stronger case for hedging.
Practical Takeaways for European Investors
Don't judge a portfolio by its euro total alone. Always check what's happening in the asset's local currency before concluding anything about investment quality.
Use your portfolio tracker's currency breakdown. Folia shows per-holding performance in both local currency and your base currency. Use it. The difference is the currency effect.
Rebalancing moments. A period of euro strength is actually a useful time to add to US positions if you're a long-term investor — you're getting more dollars per euro than you were before.
Keep perspective on time horizon. Over 20 years, the EUR/USD has swung from 0.83 to 1.60 and back to parity and beyond. Short-term moves are noise for long-term investors.
Diversify currency exposure intentionally. If 100% of your equity portfolio is in USD-denominated assets, you have a concentrated currency bet. European stocks, Asian markets, and bonds in different currencies all reduce this concentration.
The Bigger Picture
Currency is a risk that doesn't show up in most conversations about portfolio construction. We talk endlessly about sector allocation, P/E ratios, interest rate sensitivity — but the currency layer sits underneath all of it for international investors, silently amplifying or dampening everything.
Understanding it doesn't mean you need to actively trade currencies or build elaborate hedging strategies. It just means you can look at a down month in your portfolio and ask the right question: Is this about the investment, or is this about the euro?
Most of the time, if the answer is "the euro," the right move is patience.
Your portfolio might be down in euros today. But if your assets are sound, the underlying story is still intact — and the exchange rate will have its own story to tell tomorrow.
Folia is a portfolio tracker built for European investors who hold assets across multiple currencies and markets. See your returns in local currency and your base currency side by side — so you always know what's really driving your performance.
