Home Trading ETFs A Deeper Look At Liquidity In Smaller ETFs

A Deeper Look At Liquidity In Smaller ETFs

by TradingETFs.com
A Deeper Look At Liquidity In Smaller ETFs

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By Tony Barchetto, CFA

One of the challenges in bringing new ETFs to market is getting over the initial hurdles posed by the smaller asset levels and lower on-screen liquidity of the fund. If a fund has very little ADV, a large investor can still execute a sizable block in the fund at or often in between the bid-ask spread as long as the underlying basket is liquid. But the smaller investor (or their advisor) often ends up paying the bid-ask spread on the screen, especially if a market order is used. [1]

Despite their ability to transact in size, larger investors are often wary of being the early money into a newer fund and prefer to see the smaller investors aggregate and build up the assets first. Smaller investors are generally not as concerned by overall fund size but must contend more with spreads and on-screen liquidity.

Given this dynamic, we took a detailed look at the liquidity metrics by size for smaller ETFs. With over 2,200 ETFs listed in the US tracking domestic stocks, international stocks, commodities and a host of other types of assets, we limited the analysis to only funds consisting of US equities. This allows for a more apples to apples comparison in a single category across a range of fund sizes.

We further filtered the list for funds with a minimum of $100 million a day in daily implied liquidity (of the underlying basket), as measured by Bloomberg [2]. This eliminates funds with more concentrated or illiquid portfolios that would not be comparable to your average equity fund. As of March 19, 2019, there were 476 US equity ETFs meeting the criteria.

The table below shows several liquidity indicators aggregated by fund size in $50 million increments at the low end and increasing in ranges at the larger fund levels. This was done to tilt the balance towards the smaller funds to more precisely summarize the relationship between size and liquidity. We also show all funds with over $2.4 billion in assets aggregated in a single group for comparison.

Table 1 – US Equity ETFs Over $100 Million in Daily Implied Liquidity
March 19, 2019

AUM Range ($mn)

Funds

Median Spread (cents)

Avg Spread (bps)

30D ADV

Avg 13F Holders

Avg Implied Liquidity ($mn)

Age in Years

0-50

116

7.2

21.3

3,661

7.7

$2,060

2.6

50-100

40

6.3

16.0

11,028

20.6

$990

4.2

100-150

31

6.0

13.5

26,045

28.1

$832

5.6

150-300

44

7.8

15.9

30,209

36.8

$1,118

7.2

300-600

46

4.6

7.2

74,921

65.9

$1,232

8.6

600-1200

58

2.9

4.3

249,212

106.6

$1,763

9.8

1200-2400

41

2.3

3.2

705,643

169.2

$2,307

11.8

>2400

100

2.2

2.0

3,563,795

596.6

$2,782

14.4

TOTALS

476

4.8

10.5

854,184

168.9

$1,893

8.1

Source: Bloomberg. All are simple, non-weighted averages.

It should not be surprising that as assets increase, spreads tend to decline, ADV increases, and the number of institutional holders (public 13F filers) increase. The average spread for funds in the $50-100 million range drops by 5.3 basis points from smallest segment and then another 2.5 basis points after crossing into the $100-150 million range for a total decline of nearly 37%. But then spread costs increase in the $150-300 million bracket before resuming their decline with higher asset levels but at a slower rate. However, a handful of funds in the $150-300 million bracket with unusually large spreads skewed the data. A look at the median spread in basis points for each segment reduces the impact of these outliers, showing a more consistent decline in spread cost with asset level.

Figure 1 – Median Spread by AUM Range (in basis points)
March 19, 2019 – US Equity ETFs with Over $100 million in Implied Liquidity

Source: Bloomberg

However, the implied liquidity tells a different story. There does appear to be a relationship between the implied liquidity and both spreads and traded liquidity (ADV) as AUM increases. But this may just reflect more of the “natural” capacity for some funds. Funds with smaller capitalization stocks or narrowly-defined portfolios (i.e. thematic funds) may reach a point in which some larger investors cannot easily transact due to limitations in the underlying liquidity, keeping a lid on fund assets even as the funds mature (note the increasing age in funds in Table 1 with asset level).

The smallest bucket is unique in this regard. The average implied liquidity in the $0-50 million bracket is over $2 billion – much higher than most of the middle AUM range. This suggests many smaller funds do have very liquid underlying baskets but just have low levels of daily trading activity in the funds.

Figure 2 – Average Daily Implied Liquidity by AUM Range (in $ millions)
March 19, 2019 – US Equity ETFs Over $100 million in Daily Implied Liquidity

Source: Bloomberg

The frictional costs – namely spreads and commissions – are one of the few drawbacks of ETFs versus their many benefits in comparison to mutual funds. But putting it in perspective, many investors use ETFs for buy and hold investing, making entry and exit costs relatively infrequent compared to the annual savings enjoyed from generally lower fees on ETFs.

In addition, while the full quoted spreads are summarized above, a more accurate assessment of cost would be the difference between the bid or offer and the fair value for the underlying portfolio (estimated by the INAV) – not the entire spread. The fair value for the portfolio will typically be in between the spread with the bid and offer falling just outside. This means the true cost is generally about half the quoted spread, pushing the 10-20 bps spread in equity ETFs under $300 million down to an effective cost of about 5-10 bps.

Considering any investment involves weighing the merits of the strategy along with the total costs – implementation, expense ratio, taxes, etc. Transaction costs such as commissions and spreads are real expenses that should be weighed along with the other factors. But if the underlying securities in the fund are generally liquid and the expense ratio is attractive, a one-time 5-10 bps cost to access a differentiated strategy with the potential to outperform is a small price to pay. If enough investors make that leap, the data suggest that 5-10 bps spread will begin to shrink with even a modest boost in assets.

[1] We believe using a limit order is generally a best practice for any ETF order. Most retail investors orders in the US are executed off-exchange by competing market makers that must provide some price improvement to continue attracting order flow. A well-placed limit order in an ETF has the potential to be executed at prices better than the bid or offer. The firms competing for retail order flow are also among the largest participants in the ETF market executing blocks for large investors.

[2] Bloomberg’s Implied Liquidity metric estimates the share and dollar amount that could potentially be traded in an ETF in one day based on the liquidity available in the underlying basket. By default, it assumes that 25% of the ADV of each component could be traded without adversely affecting the price and then uses the weights to calculate the least liquid component and scales the basket using this constraint.


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Editor’s Note: The summary bullets for this article were chosen by Seeking Alpha editors.

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