
Right here’s the difficulty: Throughout instances of utmost market stress, the company bond portion—largely BBB-rated bonds—can see their worth drop sharply and change into illiquid.
Why does this matter for ETFs? Throughout March 2020’s COVID crash, we noticed panicked posts from traders on Reddit like:
Why did some bond funds crash?
ETFs use an “in-kind” creation/redemption course of to maintain their market worth aligned with their internet asset worth (NAV). When traders purchase or promote ETF items, approved members (APs)—usually giant establishments like banks or market makers—both create new ETF items by buying the underlying bonds or redeem shares by promoting them again into the market.
When the market will get chaotic, over-the-counter traded company bonds can change into much more illiquid than ordinary—particularly in comparison with shares, which commerce on exchanges, and authorities bonds, which commerce in excessive volumes. This issues as a result of APs depend on sourcing these bonds for in-kind creations and redemptions of ETF shares. When company bonds change into illiquid, it will get more durable to cost them precisely, and the ETF’s market worth can deviate considerably from NAV.
In consequence, throughout the top of the March 2020 panic, ZAG’s market worth truly traded at an excessive low cost to NAV, as deep as -11.3%.

If you happen to have been holding ZAG as a secure refuge, and deliberate to purchase the equities dip, this wouldn’t have labored since you would have needed to promote at a steep low cost simply to exit. ZAG wasn’t the low-risk ballast many traders assumed it might be. Sure, the low cost to NAV reversed rapidly inside days, because of fast authorities stimulus that stabilized the market. However the COVID-19 crash was short-lived. Who is aware of what the following disaster will appear to be?
If company bond markets freeze up once more, you can see the identical liquidity points. And if that occurs, a broad bond ETF like ZAG could not present the protection you’re relying on.
keep away from a bond-market freeze
Personally, for my bond allocation, I’ve discarded combination bond ETFs like ZAG completely and rely completely on government-issued bonds. For myself, with a U.S. dollar-dominant portfolio, meaning U.S. Treasuries. However for Canadians investing in Canadian {dollars}, a stable different is the iShares Core Canadian Authorities Bond Index ETF (XGB), which tracks the FTSE Canada All Authorities Bond Index.