Most Canadian investors know diversification matters — but far fewer realize their portfolio might be dangerously concentrated without showing any obvious warning signs. You might hold five ETFs and still have 40% of your money riding on a handful of US mega-cap tech stocks. WealthWise's concentration risk score is designed to surface exactly that kind of hidden exposure, giving you a clear, actionable number instead of a vague feeling that something might be off.
Concentration risk is the danger that comes from having too much of your wealth tied to a single stock, a single sector, or a single country. When that one position moves sharply against you, the damage to your overall portfolio is disproportionate — because there isn't enough diversification to cushion the blow.
The risk shows up in two distinct forms:
The insidious thing about the second type is that it's completely invisible from the fund names alone. You need to look through each ETF to its actual underlying constituents before you can see what you truly own.
WealthWise computes your concentration risk score by performing a look-through analysis of every position in your portfolio — including ETFs. Rather than treating an ETF as a single holding, the tool decomposes it into its actual underlying stocks and sectors, weighted by the ETF's real top-holdings data. This means two things happen simultaneously:
The resulting score reflects how much your returns would be impacted by a shock to a single concentration point. A lower score indicates a more broadly diversified portfolio; a higher score signals meaningful concentration somewhere in the stack that warrants attention.
The score is not a prediction of future returns — it's a structural diagnostic. Think of it like a blood-pressure reading: it doesn't tell you when the problem will happen, but it tells you whether your portfolio is in a healthy range or carrying elevated risk.
How portfolio composition tends to affect the concentration risk score.
WealthWise presents the concentration risk score alongside a breakdown of where the concentration actually lives. You'll see:
A portfolio of genuinely diversified all-in-one ETFs like XEQT or VEQT will score well because the geographic and sector exposure is already spread broadly by design. A portfolio of three overlapping US-focused ETFs plus a few individual tech names will score poorly — even if the account balance looks large and the fund names sound different.
For a deeper look at how the sector look-through works under the hood, see our guide on ETF sector breakdown and look-through analysis.
| Fund | What It Says It Does | Largest Underlying Holdings |
|---|---|---|
| VFV | Tracks the S&P 500 | Apple, Microsoft, Nvidia, Amazon, Meta |
| XQQ | Tracks the Nasdaq-100 | Apple, Microsoft, Nvidia, Amazon, Meta |
| XEQT | Global all-in-one equity | Apple, Microsoft, Nvidia, Amazon (via US weight ~45%) |
A simplified example of how three differently-named funds can hold the same top positions.
ETF overlap is one of the most common — and most underappreciated — sources of concentration risk for Canadian DIY investors. Consider a simplified example:
| Fund | What It Says It Does | Largest Underlying Holdings |
|---|---|---|
| VFV | Tracks the S&P 500 | Apple, Microsoft, Nvidia, Amazon, Meta |
| XQQ | Tracks the Nasdaq-100 | Apple, Microsoft, Nvidia, Amazon, Meta |
| XEQT | Global all-in-one equity | Apple, Microsoft, Nvidia, Amazon (via US weight ~45%) |
Hold all three in equal weight and you haven't diversified — you've tripled down on the same handful of mega-cap US technology companies. A sharp drop in that cluster hits every one of your funds at the same time, for the same reason. WealthWise's overlap detection aggregates these positions across your entire account roster (TFSA, RRSP, non-registered) to show you the real picture.
To understand how geographic exposure is derived from actual ETF holdings data, see our article on geographic exposure in Canadian ETF portfolios.
Concentration risk becomes most dangerous precisely when markets are stressed — the moments when you most need your diversification to hold. During a sector selloff or a country-specific shock, correlated positions fall together. A well-diversified portfolio doesn't avoid losses, but it avoids the kind of catastrophic drawdown that forces investors to sell at the worst possible time.
For investors using a benchmark like the S&P 500 for comparison — which WealthWise supports through Modified-Dietz time-weighted returns — concentration in US tech can actually create benchmark-hugging behaviour where you think you're diversified but you're really just tracking the index with extra fees and lower liquidity. See our piece on comparing your portfolio to the S&P 500 for more on how that benchmark comparison works.
| Single-Stock Weight | What It Suggests |
|---|---|
| Above roughly 10–15% | Warrants a closer look |
| 15–20% (grown via appreciation) | Deserves a deliberate decision: hold intentionally or trim back toward target weight |
Rough single-stock weight thresholds worth keeping an eye on.
The risk score is most useful as a conversation starter with yourself. When you see a high score, the right next question is: is this intentional concentration I'm comfortable with, or is it accidental overlap I didn't realize was there?
Some common actions Canadian investors take after reviewing their risk score:
WealthWise is a free Canadian portfolio tracker built specifically as a companion to Wealthsimple, Questrade, Disnat, and other Canadian brokerages. It does not execute trades and has no access to your login credentials — the broker sync uses SnapTrade's read-only connection, which means WealthWise can see your holdings but cannot move your money.
The concentration risk score is part of the core analysis suite, available to all users at no cost. It works whether you've synced your broker directly, imported a CSV from your brokerage, or entered holdings manually. For investors who want to track dividends, run DRIP simulations, compare their returns to a benchmark, or monitor their progress toward a passive income goal, all of those tools live in the same free dashboard.
If you're building or reviewing a portfolio and want to understand where your real risk lies — not just the fund names but the actual underlying exposures — the concentration risk score gives you that picture in seconds.
There's no universal threshold — the right score depends on your investment strategy and risk tolerance. A portfolio of diversified all-in-one ETFs like XEQT or VEQT will naturally score better than one with multiple overlapping US-focused funds or large single-stock positions. The score is most useful as a relative diagnostic: if it's high, investigate where the concentration lives and decide if it's intentional.
Yes, absolutely. ETF overlap is one of the most common hidden sources of concentration risk. If your ETFs share the same underlying stocks — particularly US mega-cap technology companies — holding more funds doesn't reduce your exposure to those names. WealthWise's look-through analysis aggregates the underlying holdings across all your ETFs to reveal the true picture.
Yes. WealthWise aggregates positions across all connected and imported accounts — TFSA, RRSP, non-registered, and others. This is important because concentration that looks acceptable within a single account can be significant at the household level, particularly if the same ETFs appear across multiple accounts.
Not necessarily. Concentration is a choice some investors make deliberately — for example, holding a large employer stock position or making a high-conviction sector bet. The risk score doesn't tell you what to do; it tells you where your risk is. The key question is whether the concentration is intentional and understood, or accidental overlap you didn't realize was there.
WealthWise derives sector and geographic exposure from each ETF's real top-holdings data, using a look-through approach that also handles ETF-of-ETFs structures. Geographic exposure is derived from the underlying holdings weighted by fund allocation rather than the ETF's stated mandate, which gives a more accurate real-world picture.
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