Wall Street is changing how it trades the world’s hottest investment product

Bonds are taking a growing share of large ETF trades. The fixed income market is opaque relative to stocks, causing shares of funds to trade more in big chunks.

Bond exchange-traded funds have exploded in size in the last few years. The big ticket trades in them are getting bigger too.

Exchange-traded funds were originally launched as a vehicle for stocks, and they’ve been attracting assets at a fast clip in recent years. The combined assets of US ETFs stood at $2.7 trillion in February, according to the Investment Company Institute, of which $457.4 billion was in bond ETFs.

A growing chunk of the trading in these bond ETFs is now in large sizes, with the percentage of bond ETF block trades doubling over the past six years.

Close to $1 in every $4 of bond ETFs traded part of a block trade, according to Credit Suisse. While blocks are commonly defined as those exceeding 10,000 shares or $200,000 in total value, the average bond ETFs block trade was $812,000 per trade in 2016, and $852,000 in the first two months of 2017.

Perhaps unsurprisingly, fixed income is also leading growth in block trades larger than 100,000 shares, which have seen their share climb seven percentage points over the past seven years to 17%. Bond funds currently account for about 40% of the large trades of more than 100,000 shares, up from less than 10% in 2010, Credit Suisse data show.

As an extension of that, 17 of the 20 ETFs most frequently traded in blocks are bond-related. The explanation offered by Credit Suisse is that the bond market is less transparent, which hampers the efforts of traders who use computer-based trading models to transact. As a result, the securities are traded in larger chunks.


The popularity of bond ETFs specifically has at least partially stemmed from a prolonged period of low interest rates.

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By boasting attractive yields, bond ETFs have been used by investors as an alternative to investments such as money markets funds, which can offer lower returns.

Further, while liquidity in the cash market has gotten tight, ETFs provide investors a handy way to easily move in and out. Bond funds are also used by firms to smooth out holdings in separately managed accounts, according to Credit Suisse.

Block trading in ETFs across all asset classes totaled more than $3 trillion in 2016 for the third straight year, according to the firm, which projects similar levels for full-year 2017.

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