ETF Guide



What is an Exchange Traded Fund (ETF)?

ETFs are an easy way to gain exposure to a pool of investments without having to buy each one individually. They can track a stock market index, such as the FTSE 100, an asset class, such as government bonds, a market segment, such as bonds maturing in fewer than five years, a region or a sector. ETFs are referred to as “passive” investments, or passive funds, in that they attempt to track the performance of a market index or pool of investments, unlike “active” funds which try to beat the index.

ETFs are also known as “open-ended” investments/funds rather than “closed-ended”. This means that when money is invested in the fund, new shares (units) are created. When money is withdrawn units are redeemed. ETFs, like all exchange traded products, are traded on a recognised stock exchange, such as the London Stock Exchange.

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Why use an ETF?

Some of the key attractions of investing in ETFs are low cost, transparency, flexibility and choice. An ETF tracking a developed equity market such as the FTSE 100 can cost as little as 0.86%, based on the asset weighted average for active funds within the IA UK All Companies sector as at Dec 2019. Unlike a unit trust, which trades at one set price point during the day, ETFs can be traded whenever the stock exchange is open. This makes them a flexible way of investing.

Investing in ETFs also makes it easier to diversify your portfolio. For example, buying an ETF that tracks the S&P500 is comparable to buying a small part, in the appropriate proportion, of each of the index’s 500 companies – all at a much lower cost than would be feasible for an individual given the commissions charged for each trade.

Similarly, a typical corporate bond ETF would contain more than 200 individual bonds, so the default risk is highly diversified.

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How do we select our ETFs?

For each asset class, region or market segment, we find what we consider to be the best ETF, while continuously monitoring the alternatives. As our aim is to provide a diverse set of opportunities for our customers, we try to assess as many ETFs as possible. These are some of the most important factors that inform our thinking.

1. The components of the market index

It is always important to ask: would I like to invest in the components of this index? Indices are rules-based methodologies and are normally constructed by weighting each underlying instrument according to its market capitalisation (size) in that particular market. As a result, some indices give a large weight to one particular company or country. By looking at the underlying components we can judge whether each index is, in our opinion, a suitable investment, and whether it accurately reflects our investment team’s views.

2. Method of replication and tracking error

The method for holding the physical components of an index varies from fund to fund. Many funds use a system of optimisation, whereby a sample of the holdings are used to replicate the index’s performance as a whole. In order to do this, we look at what is known as the tracking difference of each ETF – how closely the ETF manager has matched the performance of the index – and look to select funds which are as closely aligned as possible.

3. Costs

Subject to other factors listed here, we aim to hold the fund with the lowest overall cost in each asset class. This includes the fund's total expense ratio (TER), a measure of the cost of running the fund and the managers’ fees which are charged to investors and taken from the daily value of the fund but critically also considers the fund's performance and the costs of trading. We seek to select the fund that delivers the most overall value for our customers.

4. Size and trading volume

Size and trading volume of an ETF are important considerations, and clearly, we do not want to invest large amounts in an ETF where trading volume is limited. We typically aim to use the ETF with the lowest bid-offer spreads – i.e. the smallest gap between the cost of buying and selling each fund. While a low TER may look attractive, if the bid-offer spread is very large and/or the fund size is very small, we would not necessarily use that fund until these conditions have improved. We also seek to understand the liquidity dynamics for the underlying index holdings, in order to better understand the costs of ‘creating’ or ‘redeeming’ a given ETF.

5. The type of ETF

There are two main types of ETFs: “physical”; and “synthetic” or “swap-based”. At Nutmeg we invest only in physical ETFs, which aim to produce the performance of an index by investing in its individual components.

Synthetic ETFs, on the other hand, use a “swap” (a legal agreement between two parties, of which one is normally a bank) to produce the return, while holding the assets of the fund as collateral. Collateral can take the form of many instruments and may be completely unrelated to the index the ETF is trying to replicate. In some instances – commonly in more esoteric markets – a synthetic ETF can occasionally have lower costs than a physical ETF, but we believe that investing in a physical ETF is safer as it is less exposed to what is known as counterparty risk: the chance that one party in the transaction may go bust. Moreover, the collateral held in the synthetic ETF can sometimes be of a poor quality, or difficult to trade.

Similarly, we do not invest in “leveraged” or “short” ETFs. Leveraged ETFs attempt to use borrowing to provide a multiple of the performance of an index – for example, twice the monthly performance of the FTSE100. Short or “inverse” ETFs aim to produce the opposite – for example, if the FTSE 100 fell by 2 per cent, the short FTSE ETF would rise by 2 percent. We believe that these sort of ETFs are more appropriate for day traders than long-term investors. When we believe markets are likely to fall, we can take other measures to help protect portfolios, such as buying government bonds.

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Which currencies are ETFs traded in?

ETFs are commonly traded in Sterling, US Dollars and Euros. For non-UK indices (such as the S&P 500) the ETF is often traded in US Dollars and Sterling, giving investors a choice. However, while a Dollar-based ETF may also trade in Sterling, it is still at risk of currency fluctuations. We consider this currency risk when investing in an ETF and in certain circumstances may invest in a “hedged” version of a fund to mitigate the risk.

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Do we hold any actively managed or enhanced ETFs in our portfolios?

A passive investment strategy has potential benefits, including lower fees, greater transparency and tax efficiency. But where passive funds are designed to mimic a market index, the intention behind an actively managed ETF is to outperform a market index.

At Nutmeg we actively choose a broad range of ETFs, assigning and re-assigning our customers’ money based on our rigorous analysis of the global economy. We will utilise active ETFs where we believe there is a strong rationale for doing, though allocations are unlikely to make up a large proportion of portfolios. Additionally, we do allocate to “smart beta” or “enhanced” ETFs, which track specially constructed indices. These are often constructed to deal with specific inadequacies or excessive bias in some indices. Commonly these indices weight holdings according to other fundamental factors (such as dividend payouts or country size), rather than simply using market capitalisation as the weight, however they remain rules-based.

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What are the risks of ETFs?

One of the potential downsides of an ETF is that, because it does not always hold every asset in the index it is trying to replicate, there will be a slight difference between its performance and that of the index. Although this “tracking difference” can work in an investor’s favour, it can also work against them.

Although the majority of the ETFs we choose are traded in British pounds, those traded in a different currency can expose you to foreign exchange risk. The exchange rate fluctuations may affect the capital performance and income generated from these ETFs when converted to sterling.

All investments carry risks, and this is no different for ETFs. And while they may not be protected under the Financial Services Compensation Scheme, in the very unlikely event that the ETF provider goes bust, you would still have access to the ETF assets, which are ring-fenced and held by a separate custodian.

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What types of ETFs are there?

We’ve included a few of the most popular ETF types below, but this is by no means an exhaustive list:

1. Commodity ETFs

A commodity ETF will track the price of a particular commodity, such as gold, corn or natural gas. Historically, the correlation between commodities and equities has been quite weak, and so many investors include commodity ETFs as part of a diversified portfolio. It’s important to note that purchasing a commodity ETF does not mean the investor buys the commodity per se, but a contract that mirrors the price.

2. Sector ETFs

A sector ETF tracks a particular industry, be it technology or healthcare, and typically states the name of the sector – or sub-sector – in its title. Investors may favour a sector ETF in order to benefit from the business cycle or to leverage one sector’s risk/reward characteristics. For example, technology may be prone to more volatility than a traditionally stable sector like utilities.

3. Broad-market ETFs

By far the most popular type of ETFs are those tracking a large part, if not all, of the stock market – and typically an equity index like the Russell 3000 or S&P500. In this instance, the underlying stocks are highly diversified and likely to encompass both household names and lesser-known companies from across a range of industries.

4. Smart Beta ETFs

Smart Beta ETFs are slightly different in that they follow a rules-based, systematic approach to choosing stocks from a particular index. These ETFs still track an index, while also considering alternative factors such as total earnings, profits, revenue, or financially driven fundamentals and metrics. This type of ETF is still relatively new and, as such, trading volumes and liquidity are generally lower than average.

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What is the difference between an ETF and a mutual fund

The big idea behind ETFs was to give investors a tax-efficient and liquid product that was not a mutual fund. At their core, both ETFs and mutual funds are made up of money pooled by many investors, the premise being that individual investors have access to expertise and investments they otherwise wouldn’t.

The most obvious difference to a mutual fund is that ETFs are exchange traded, so we can transact in the ETF throughout the day, rather than at one set point each day as in the case of a mutual fund tracker (typically around midday). This provides additional flexibility in managing portfolios and means whole units of the fund can be bought and sold between investors without needing to buy and sell the underlying holdings of the fund.

Flexibility is just one part of the equation. ETFs allow us to understand the exact price at which we will purchase or sell the security, before the transaction takes place. This is critical to efficiently managing portfolios, and to many investors’ surprise this is not the case with mutual funds. Similarly, ETFs offer daily transparency on their holdings, allowing us to better understand and model risk, whereas mutual funds typically offer investors this insight once a month (and often delayed).

Because a mutual fund index tracker prices and trades once a day, you will typically not know the price at which you have bought or sold until after the transaction. ETFs, on the other hand, trade on recognised stock exchanges, meaning pricing visibility is high and they can be traded whenever the relevant stock market is open.

Finally, the range of ETFs on offer is much broader than that of mutual funds. ETFs offer access to many assets that tracker funds do not, and in many other shapes and forms. This fact provides us with more tools with which we can implement our investment ideas, and allows a higher degree of risk control and granularity when managing portfolios.

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