WealthSector ETFs in Canada: Understanding the Risks Before You Buy
What Is a Sector ETF?
A sector exchange-traded fund (ETF) holds stocks from a single economic sector instead of tracking the broad market. Rather than owning a little bit of everything, you own a concentrated position in one industry: financials, energy, technology, health care, materials, utilities, and so on.
In Canada, sector ETFs typically track the sectors defined by the S&P/TSX Composite Index, maintained by the TMX Group. You can buy and sell a sector ETF on the Toronto Stock Exchange the same way you would buy any individual stock.
Major TSX Sectors at a Glance
The S&P/TSX Composite divides Canadian companies into eleven main sectors. Here is a simplified breakdown:
| Sector | Example Companies | Approx. TSX Weight |
|---|---|---|
| Financials | RBC, TD, Manulife | ~32% |
| Energy | CNQ, Suncor, Enbridge | ~18% |
| Materials | Barrick, Agnico Eagle | ~12% |
| Industrials | CN Rail, Waste Connections | ~11% |
| Information Technology | Shopify, CGI | ~8% |
| Utilities | Fortis, Hydro One | ~5% |
| Real Estate (REITs) | Brookfield, RioCan | ~3% |
| Other Sectors | Health Care, Telecom, Consumer | ~11% |
Source: TMX Group / S&P Dow Jones Indices. Weights fluctuate over time.
Why Some Investors Use Sector ETFs
There are legitimate reasons to add a sector ETF to your portfolio — as long as you do it with full awareness of the trade-offs:
- Expressing a conviction. If you believe clean energy will outperform over the next decade, a sector ETF lets you tilt toward that theme more directly than a broad index fund would.
- Filling a gap. A Canadian broad-market ETF offers limited exposure to global technology. Some investors add a technology sector ETF to balance that regional bias.
- Income and yield. Utilities and REIT sector ETFs often distribute regular income, which can suit a dividend or income strategy.
The Ontario Securities Commission and provincial securities regulator, through GetSmarterAboutMoney.ca, recommend always assessing whether any investment fits your risk tolerance and time horizon before you buy.
| Slice of the S&P/TSX Composite | Approx. weight |
|---|---|
| Financials alone | ~32% |
| Financials + Energy combined | ~50% |
If you already hold a broad TSX index ETF, these two sectors are already dominating your exposure before you add any sector ETF on top.
The Canadian Trap: You May Already Be Concentrated
Here is the most underappreciated risk for Canadian investors: the S&P/TSX Composite is already heavily concentrated. Financials and energy together make up roughly 50% of the index.
That means if you hold a broad TSX index ETF and add a Canadian bank sector ETF "for the dividends," you are doubling your exposure to banks without necessarily realizing it. This is called overlap risk. You can review the sector breakdown of your existing ETFs here, or check your overall diversification level here.
Before buying any sector ETF, ask yourself: am I actually increasing my diversification, or am I concentrating a risk I already have?
Lean sector ETF when…
- You want to express a specific conviction about one industry
- You're deliberately filling a gap in your existing portfolio (e.g., global tech exposure)
- You're seeking income from a sector known for regular distributions, like utilities or REITs
Lean broad-market ETF when…
- You want the natural cushion that comes from spreading across industries
- You can't confidently time when to enter and exit a single sector
- You want to avoid the higher management expense ratios (MERs) typical of sector ETFs
- You're building the foundation (core) of your portfolio rather than a smaller satellite position
Key Risks to Understand
- Concentration risk. A single sector can underperform for an entire decade (e.g., energy from 2015 to 2020). You lose the natural cushion that comes from spreading across industries.
- Timing is hard. Identifying the right moment to enter and exit a sector is extremely difficult — even for professional fund managers. Academic research consistently supports this.
- Higher fees. Sector ETFs typically carry higher management expense ratios (MERs) than broad index ETFs, which compounds into a meaningful drag on long-term returns.
- Lower liquidity in niche funds. Some specialized sector ETFs trade in low volumes, which can widen the bid-ask spread and raise your effective trading cost.
The core
- A low-cost, diversified broad-market ETF
- The foundation of the portfolio
- Represents the majority of the total
The satellite
- Smaller, targeted positions — including sector ETFs
- Not a starting point and not a substitute for the core
- Represents a minority of the total
How to Use Them: Satellite, Not Core
Financial planners often describe a "core and satellite" approach: the core of a portfolio is a low-cost, diversified broad-market ETF; satellites are smaller, targeted positions — including sector ETFs — that represent a minority of the total.
If you want to explore how many ETFs it makes sense to hold overall, see this article. And if you already hold Canadian bank stocks directly, keep in mind you may already have significant financial-sector exposure — see our breakdown of Canadian bank stocks.
The bottom line: sector ETFs are valid tools for investors who understand their full portfolio picture. They are not a starting point, and they are not a substitute for a diversified index fund as your foundation.
Frequently asked questions
What exactly is a sector ETF?
A sector ETF is an exchange-traded fund that invests only in companies from a single economic sector — such as financials, energy, or technology. Unlike a broad index ETF, it does not spread exposure across the full market.
Are sector ETFs riskier than broad-market ETFs?
Generally, yes. By concentrating your money in one sector, you lose the diversification that cushions losses when a single industry goes through a rough period. The concentration risk is meaningfully higher than in a diversified index fund.
Am I already overexposed to Canadian banks without knowing it?
Possibly. The S&P/TSX Composite allocates roughly 32% of its weight to financials. If you hold a TSX index ETF and add a Canadian bank sector ETF on top, you are doubling that bank exposure. Always check the holdings of each ETF before buying.
Can sector ETFs form the core of my portfolio?
From an educational standpoint, this is not generally recommended. A single sector can underperform for years at a time. The foundation of a portfolio should be broadly diversified; sector ETFs work better as small satellite positions.
How do I find sector ETFs available in Canada?
The TMX Group website (tmx.com) lists all ETFs traded on the Toronto Stock Exchange. You can filter by category to find Canadian sector ETFs. Always check the MER, trading volume, and underlying holdings before investing.
Are sector ETFs suitable for beginner investors?
Not as a first investment. It is better to understand basic diversification, your own risk profile, and your current portfolio composition before adding concentrated sector positions.
Sources & references
Educational content; verify figures with official sources before acting.