When it comes to holding an exchange-traded product (ETP), the expense ratio is all-important. When it comes to trading an ETP, another number matters more: the bid/ask spread.
The spread between the bid (the highest price a buyer is willing to pay) and the ask (the lowest price a seller is willing to accept) is a significant part of an ETP's trading cost. (Trading costs are reflected on ETF.com fund reports.)
As a general rule, ETPs with significant assets and trading volume tend to have smaller spreads than ETPs with minimal assets and light volume. For example, the $388 billion SPDR S&P 500 ETF Trust (SPY), the largest and most liquid ETP in the world, has an average spread of 0.0032%—essentially zero. That’s great news for investors buying and selling the fund.
SPY’s tiny spread is certainly not the norm for ETPs. Data compiled by ETF.com shows that the average bid/ask spread for the more than 2,900 ETPs listed on U.S. exchanges is 0.52%.
How Statistics Are Skewed
The average is calculated by summing all ETP spreads and then dividing by the number of ETPs on the market.
A plethora of thinly traded products with little to no assets and large spreads—many of them exchange-traded notes—such as the Elements Spectrum Large Cap US Sector Momentum Index ETN (EEH), the iPath Return On Disability ETN (RODI) and the Credit Suisse S&P MLP Index ETN (MLPO), inflates the average.
That’s why some people prefer looking at the median ETP spread, which comes from lining up all the spreads from lowest to highest and taking the middle figure: 0.20%.
Another figure to consider is the asset-weighted average spread, which is calculated by giving more weight to bigger ETPs. It is only 0.03% for U.S.-listed ETPs, much lower than the regular average, since investors have most of their money in large, liquid products.
ETFs With The Lowest Spreads
ETFs With The Highest Spreads
Spreads By Asset Class
As a group, fixed income ETPs tend to have the lowest spreads. The average bid/ask spread for the group is 0.25%, while the median spread is 0.14%.
Equity ETFs also tend to have low spreads, with average and median spreads of 0.41% and 0.21%, respectively.
On the flip side, alternatives ETPs and commodity ETPs are areas where spreads tend to be relatively high—over 0.5% on average—suggesting investors should use caution when buying and selling those types of products.
Spreads are an important factor in determining the total cost of trading an ETP. Investors should be mindful of an ETP's bid/ask spread when buying or selling.
To find out the average spread for a particular ETP, visit the fund page for the ETP in question at www.etf.com/ticker.
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