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ETFs & Index Funds

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ETFs & Index Funds: Diversified Investing Made Accessible

Exchange-traded funds (ETFs) and index funds allow investors to gain exposure to a collection of securities through a single investment. Instead of selecting individual stocks or bonds, an investor can use a fund to access dozens, hundreds, or even thousands of securities at once.

Many ETFs and index funds are designed to follow a market index, such as a broad stock market, a specific sector, a bond market, or an international market. This approach can provide diversification, transparency, and relatively straightforward access to different parts of the financial markets.

What Is an ETF?

An ETF is an investment fund whose shares trade on a stock exchange. The fund owns a portfolio of underlying assets, which may include stocks, bonds, commodities, or other securities.

Investors buy and sell ETF shares throughout the trading day in much the same way they trade individual stocks. The market price of an ETF can change continuously while the market is open.

  • ETFs can hold many investments within a single fund.
  • ETF shares generally trade throughout the market day.
  • Funds may follow an index or use an actively managed strategy.
  • ETFs can provide exposure to stocks, bonds, sectors, countries, commodities, and other markets.
  • Investors remain exposed to the risks of the assets held by the fund.

What Is an Index Fund?

An index fund is designed to track the performance of a particular market index. Instead of attempting to select securities expected to outperform the market, the fund generally seeks to replicate or closely follow the composition and performance of its benchmark.

Index funds can be structured as ETFs or as traditional mutual funds. This means that an ETF and an index fund are not necessarily two completely separate categories: many ETFs are index funds, while some ETFs are actively managed and do not track an index.

ETF vs. Index Fund: Understanding the Difference

ETF

ETF describes the structure of the investment fund. ETF shares trade on exchanges throughout the market day, and their prices can fluctuate continuously as investors buy and sell them.

Index Fund

Index fund describes an investment strategy designed to track a specified benchmark. An index fund may be structured as an ETF or as a traditional mutual fund.

The distinction is important because investors should consider both how a fund is structured and how its portfolio is managed. Two funds can track the same index while having different costs, trading characteristics, tax considerations, and tracking performance.

How Index Investing Works

A market index measures the performance of a defined group of securities. Some indexes represent broad markets, while others focus on a particular industry, company size, geographic region, investment style, or asset class.

An index fund attempts to provide investment results that correspond closely to its chosen benchmark. Depending on the strategy, the fund may hold every security in the index or use a representative sample designed to produce similar performance.

Broad Market Indexes

Broad market indexes can provide exposure to large portions of a stock or bond market through a single fund, potentially spreading investment risk across many securities.

Sector Indexes

Sector indexes focus on particular areas of the economy, such as technology, healthcare, financial services, energy, or industrial companies. They are generally less diversified than broad-market funds.

International Indexes

International indexes provide exposure to companies or securities outside an investor's domestic market and can be used to increase geographic diversification.

Bond Indexes

Bond indexes can track government, corporate, municipal, or broader fixed-income markets, providing diversified exposure to many debt securities through a single fund.

Passive and Active ETFs

ETFs are often associated with passive investing, but not every ETF follows an index. Funds can use either passive or active portfolio management.

  • Passive ETFs: generally seek to track a specified index rather than outperform it through security selection.
  • Active ETFs: use portfolio managers or systematic strategies to select securities according to the fund's investment objective.

Passive funds often have lower portfolio turnover and may have lower management costs, while active funds provide managers with greater flexibility to respond to market conditions. Neither approach guarantees superior performance.

Why Investors Use ETFs and Index Funds

Funds can simplify the process of building a diversified portfolio. Instead of researching and purchasing many individual securities, an investor can gain broad exposure through one or several funds.

  • Diversification: a single fund can provide exposure to many securities.
  • Market access: funds can provide exposure to markets that may be difficult to replicate with individual investments.
  • Simplicity: broad funds can reduce the need to select and monitor many individual securities.
  • Transparency: many ETFs regularly disclose their holdings and clearly identify the index or strategy they follow.
  • Cost efficiency: many passive funds operate with relatively low management expenses, although costs vary considerably between funds.

Understanding Fund Costs

Costs reduce the return that ultimately remains with the investor. Even relatively small differences in annual expenses can become meaningful when an investment is held for many years.

Expense Ratio

The expense ratio represents annual operating expenses charged by the fund as a percentage of assets. These costs are generally deducted from fund assets rather than billed separately to investors.

Trading Costs

ETF investors may encounter brokerage commissions, bid-ask spreads, and other trading costs. These expenses can be particularly relevant when making frequent or relatively small transactions.

Tracking Difference

An index fund may not reproduce its benchmark's return exactly. Fees, transaction costs, portfolio construction, taxes, and other factors can create a difference between fund and index performance.

Risks of ETFs and Index Funds

Diversification does not make a fund risk-free. A fund can decline significantly when the securities or markets it tracks lose value. The level of risk depends heavily on what the fund owns and how its strategy is constructed.

  • Market risk: the value of the underlying investments can decline because of changing market or economic conditions.
  • Concentration risk: sector or thematic funds may depend heavily on a relatively narrow group of companies or industries.
  • Tracking risk: an index fund may perform differently from the benchmark it is designed to follow.
  • Liquidity risk: some ETFs and their underlying assets may trade less actively than others.
  • Interest-rate and credit risk: bond ETFs remain exposed to the risks of the fixed-income securities they hold.
  • Currency risk: international funds may be affected by changes in foreign exchange rates.

Broad-Market vs. Specialized ETFs

Not all ETFs provide the same degree of diversification. A broad-market fund may own securities across hundreds of companies and multiple industries, while a specialized fund may concentrate on a single sector, theme, country, commodity, or investment strategy.

Broad-Market Funds

Broad-market funds are designed to provide exposure to a large segment of a market. They are commonly used as core portfolio holdings because they can spread capital across many securities.

Specialized Funds

Specialized ETFs focus on narrower areas such as specific sectors, industries, investment themes, countries, commodities, or strategies. Their concentration can create both different return opportunities and greater portfolio risk.

ETFs and Index Funds in a Portfolio

ETFs and index funds can be used as building blocks for diversified portfolios. An investor can combine funds representing different asset classes and markets rather than attempting to construct each part of the portfolio from individual securities.

For example, a portfolio could use separate funds for domestic stocks, international stocks, and bonds. More specialized funds can then be added when additional exposure is consistent with the portfolio's objectives.

The number of funds held is less important than understanding the exposures they create. Owning several ETFs does not necessarily provide greater diversification if those funds hold many of the same securities.

What to Consider When Evaluating a Fund

A fund should be evaluated based on what it owns, how it is managed, what it costs, and how it contributes to the overall portfolio. Historical performance alone provides an incomplete picture.

  • Investment objective: understand what the fund is designed to accomplish.
  • Underlying holdings: examine which securities, sectors, countries, or asset classes the fund actually owns.
  • Index or strategy: understand how securities are selected and weighted within the portfolio.
  • Expense ratio: compare ongoing management costs with similar funds.
  • Diversification: consider whether the fund is broadly diversified or concentrated in a particular market segment.
  • Liquidity: consider trading activity, bid-ask spreads, and the liquidity of underlying investments.
  • Portfolio overlap: determine whether other funds already provide exposure to many of the same securities.

ETFs & Index Funds FAQ

An ETF is an investment fund whose shares trade on a stock exchange. The fund can hold stocks, bonds, commodities, or other assets, allowing investors to gain exposure to multiple investments through a single security.
Not exactly. ETF refers to a fund structure, while index fund refers to a strategy that seeks to track an index. Many ETFs are index funds, but index funds can also be structured as mutual funds, and some ETFs are actively managed.
Many ETFs provide diversification by holding numerous securities, but the degree of diversification varies. A broad-market ETF may hold hundreds or thousands of securities, while a specialized sector or thematic ETF may be highly concentrated.
Yes. ETF values fluctuate with their underlying investments and market conditions. Diversification can reduce certain concentration risks, but it does not prevent losses when markets or the assets held by the fund decline.
The expense ratio represents the fund's annual operating expenses as a percentage of its assets. These expenses reduce investment returns and should be considered when comparing funds with similar objectives.
ETFs can provide exposure to many different asset classes, markets, and investment strategies, so they can serve as building blocks for a diversified portfolio. Whether a particular combination is appropriate depends on the investor's objectives, time horizon, risk tolerance, and other circumstances.