How ETFs Really Work in Canada

What Exactly Is an ETF?

An exchange-traded fund (ETF) holds a basket of securities — stocks, bonds, or other assets — and issues units that trade on a stock exchange, just like shares of a company. When you buy a Canadian equity ETF on the TSX, you're not transacting directly with the fund manager: you're buying a unit from another investor at the current market price.

In theory, that market price should reflect the ETF's net asset value (NAV) — the total value of all the securities it holds, divided by the number of units outstanding. But who keeps the two in line? That's where creation and redemption comes in. For more on how ETFs compare to other structures, see our article on index funds vs. ETFs in Canada.

The Creation and Redemption Mechanism

Behind every ETF are specialized financial institutions called authorized participants (APs) — typically large banks or market makers. They are the only entities that can create or redeem units directly with the ETF manager.

Creating New Units

1. The authorized participant assembles the exact basket of underlying securities (for example, all the stocks in a S&P/TSX index in the right proportions).
2. It delivers that basket to the ETF manager.
3. In return, it receives a large block of newly created ETF units — typically 50,000 units at a time (called a "creation unit").
4. It can then sell those units on the stock exchange.

Redeeming Existing Units

1. The authorized participant buys a large block of ETF units on the open market.
2. It delivers those units to the ETF manager.
3. In return, it receives the corresponding basket of underlying securities.
4. It can then sell those securities on their own markets.

This back-and-forth creates natural arbitrage: if the ETF's market price rises above NAV, an AP can create new units cheaply and sell them at the elevated price, pushing the price back toward NAV. Conversely, if the price falls below NAV, an AP buys units cheaply and redeems them for the underlying securities, pushing the price back up.

Why an ETF's Liquidity Is Really the Liquidity of Its Holdings

Many investors avoid low-volume ETFs, fearing they'll be hard to trade. This is a common misconception. An ETF's true liquidity doesn't depend on its daily trading volume — it depends on the liquidity of its underlying holdings.

If an ETF holds large, highly liquid Canadian stocks, a market maker can easily create or redeem units to fill your order. A $500,000 ETF tracking the S&P/TSX 60 can be just as easy to trade as a $5-billion ETF, because the underlying stocks trade continuously. Where caution is warranted is with ETFs holding less liquid securities — emerging-market bonds, for example, or thinly traded small caps.

The Bid-Ask Spread and When to Avoid Trading

When you look at an ETF quote, you see two prices: the bid (the highest price someone will pay) and the ask (the lowest price someone will accept). The gap between them — the bid-ask spread — is an implicit cost you bear every time you trade.

This spread tends to be wider:

• In the first and last few minutes of the trading day, when market makers are adjusting prices and volatility is higher.
• For ETFs whose underlying holdings trade in different time zones (for example, an Asian equity ETF listed on the TSX while Asian markets are closed).

See our guide on how to buy and sell ETFs using the right order types to avoid these pitfalls.

Practical Tips for Trading ETFs in Canada

According to resources from GetSmarterAboutMoney (an initiative of the Ontario Securities Commission) and the TMX Group, here are the best practices:

• Use limit orders, not market orders. A limit order lets you set the maximum price you're willing to pay (or minimum you'll accept), protecting you from surprises if the bid-ask spread is temporarily wide.
• Avoid the first and last 15 minutes of the trading session. Prices tend to be less stable at the open and close.
• Check the bid-ask spread before placing your order. A spread above 0.10% should prompt you to pause or reconsider your order type.
• Compare the market price to the indicative NAV (iNAV). Most brokers and ETF provider websites display it in real time. A significant premium or discount may signal a less favourable moment to transact.

To understand all the fees attached to an ETF, read our piece on management fees, MER, and TER in Canada.

Premium, Discount, and Net Asset Value

Even though the creation/redemption mechanism is very efficient, small gaps between market price and NAV can persist momentarily. These are called:

• Premium: the market price is slightly above NAV (you pay a bit more than the value of the assets).
• Discount: the market price is slightly below NAV (you buy at a slight bargain relative to the assets).

For major Canadian ETFs tracking liquid indices — such as the iShares Core S&P/TSX Capped Composite or the Vanguard FTSE Canada All Cap — these gaps are typically below 0.10% and correct quickly. They can be larger for niche ETFs or during periods of extreme volatility. Learn how to read a Canadian ETF fact sheet to check these figures yourself.

Frequently asked questions