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How to invest in index funds

The ins and outs of bundling stocks with this accessible investing option.

An index fund is typically a low-cost, low-risk investment portfolio of stocks and other assets that tracks a financial market index.

They’re popular because they’re generally easy to trade and many don’t require a big investment. But it’s not guaranteed that all the funds covering an index are safe — there’s still risk of volatility.

How to start investing in index funds

Once you’re ready to invest in index funds, use a financial adviser, robo-advisor, full-service broker or online stock trading platform. One of the most accessible ways to start investing in index funds is with exchange traded funds (ETFs) — but not all ETFs are index funds and some are riskier than others.

Mutual funds are another type of index fund and can be purchased directly through their associated fund providers, such as Fidelity, Vanguard and American Funds, as well as some other brokers.

To invest in ETFs or mutual funds:

1. Consider your strategy

Ask yourself what you want to achieve through this investment. Consider your timeframe and how much risk you’re willing to take on. Will you need to withdraw the funds in a year, or do you plan top sit on them for 10 years?

2. Assess your options

Compare funds online to find a product that matches your goals. Consider the risks, the fund’s performance, the brokerage fees and other costs.

Key things to take into account when deciding on an index fund:

  • Management
  • Brokerage fees
  • Transaction fees
  • Its performance over the last 3, 5 and 10 years
  • Volatility
  • Minimum investment amount
  • How often you plan to transact with the fund

3. Sign up through a fund manager or online account

Once you’ve found the right product, find out the best way to access funds.

Access index funds through their fund providers or possibly your brokerage. Not all offer access to all mutual funds, and some do not trade mutual funds at all.

  • When applying directly to a fund manager, fill out an application, provide proof of address, ID and Social Security number. Fund with a check or proof of transaction.
  • Financial planners can also apply for an index fund on your behalf.

Access ETFs on most online trading platforms and purchase just like any other stock. Sign up for an online stock trading platform:

  • Provide personal details and proof of ID
  • Transfer money into your trading account
  • Log in to your account
  • Search for the ETF you want and place a buy order

Compare online trading platforms to invest in index funds

Ready to invest? The following table shows some of the stock trading platforms you can use to access index funds.

Name Product Stock trade fee Asset types Option trade fee Annual fee Signup bonus
Sofi Invest
Stocks, ETFs, Cryptocurrency
Get one free stock worth up to $1,000
Open an account
A free way to invest in stocks, ETFs and crypto.
Stocks, Options, ETFs
Get one free stock valued between $3.00 and $300 when you open an account, one more with a deposit
Open an account
Margin financing rates start at 3.99%. No monthly subscription fees for margin.
Stocks, ETFs
$0 per month
Download and sign up with; approved accounts receive a free stock slice worth up to $70, selected from 9 popular stocks.
Open an account
Commission-free trading in stocks and ETFs with a social networking twist.
Stocks, Options, ETFs
Free stock (chosen randomly with a value anywhere between $2.50 and $200)
Sign up using the "go to site" link
Make unlimited commission-free trades in stocks, funds, and options with Robinhood Financial.
$0 for US stocks
Stocks, Options, ETFs
$0 per year
Trade stocks on the US, Hong Kong, Shanghai and Shenzhen markets.

Compare up to 4 providers

What are index funds?

Index funds pool money from multiple investors to diversify your portfolio. They generally take a hands-off approach to investing compared to managed funds.

Because index funds don’t require active management, they tend to cost less than managed funds, and don’t cost as much to invest in.

What is a stock market index?

To understand an index fund, it’s important to know what an index is. A market index helps you understand index funds. The most well-known index is the S&P 500, which is a collection of the top 500 companies in the stock market.

These indices are popular because investors use them to track the overall performance of a market. They rise and fall depending on a range of economic indicators and company news. For example, when an economy is healthy, its stock market indices tend to rise because investors feel more confident buying stocks. If trade tensions increase between countries, stock market indices usually fall as investors become nervous.

IndexWhat it tracksWhat country it’s based in
Nasdaq CompositeThe Nasdaq stock marketUS
Nikkei 225225 blue-chip stocks on the Tokyo Stock ExchangeJapan
S&P 500Leading 500 publicly traded companies in the USUS
S&P 400400 US mid-cap stocksUS
The Russell 20002,000 small-cap US stocksUS
The Russell 30003,000 of the largest US-traded stocksUS
The Wilshire 5000All US equitiesUS
NYSE CompositeEvery common stock on the NYSEUS
The Dow Jones30 blue-chip companiesUS
The FTSE 100The 100 largest companies on the London Stock ExchangeThe United Kingdom

How do index funds work?

Index funds hold the same selection of stocks that make up the index they follow. Here are a few examples of index funds and their underlying index:

  • SPY — S&P 500 index
  • QQQ — NASDAQ 100 index
  • AGG — Bloomberg Barclays U.S. Aggregate Index (bonds)
  • VEA — FTSE Developed All Cap ex US Index
  • IWM — Russell 2000 Index
  • DIA — Dow Jones Industrial Average

If a company leaves an index, the fund manager sells its shares and replaces it with new stocks. Because these kinds of funds require minimal management, it’s known as passive investing. Index funds can be either ETFs or mutual funds.

The difference between index ETFs and traditional index mutual funds

Most ETFs are similar to traditional index mutual funds in that they are low cost and track a major underlying index, though there are a few key differences:

Trade and listingPricingWhen to buy and sellMinimum investmentFees
ETFsTraded like shares on the stock exchangeMarket value, depends on stock market performanceAny time during the trading dayLower minimum — sometimes under $100
  • Commission on some brokerages
  • Lower taxation and management fees
Mutual fundsUnlisted and bought from issuerNet asset value of underlying securities.At the end of the trading dayCan require as much as $2,500
  • No transaction fees
  • Some charge load fees

What are the benefits of investing in an index fund?

A few bright spots for index funds:

  • Cost. Passive funds require less legwork, so they typically come with less fees than funds that an advisor manages. Fees can eat into any gains in returns.
  • Higher returns. Indices have frequently beat the average returns of managed funds.
  • Easy to trade. Access multiple options for index fund ETFs on brokerage platforms.
  • Diversifies your portfolio. Investing in an index fund offers access to a range of companies from various industries.
  • Less volatile. A safer alternative to individual direct stock market investing.

What are the risks of index funds?

No investment is ever 100% safe and you should always seek professional advice before making any investment decision. Here are some of the risks that investors need to be aware of:

  • Potential to lose money. Like any investment, you take the bad with the good. When an index does well, your investment delivers profitable returns. But when an index drops, so does your investment.
  • Not all assets are safe. Do your research and find out which index funds track volatile markets — like oil. Others bundle in leveraged and inverse ETFs. Although many index funds track relatively safe major indices, technically any pool of assets can be bundled into a fund. Some index funds track volatile global markets, such as the oil sector, while others bundle in riskier investment assets, especially leveraged and inverse ETFs.
  • Not all ETFs are index funds. ETFs come in all shapes and sizes, and not all are passively managed. Some are highly complex and risky.
Disclaimer: The value of any investment can go up or down depending on news, trends and market conditions. We are not investment advisers, so do your own due diligence to understand the risks before you invest.

Bottom line

Index funds are well-diversified, accessible investments, making them a popular choice for new investors. But there are also more complex and risky ETFs thrown into the mix of most mainstream brokerage accounts. It pays to familiarize yourself with their benefits and dangers, and to compare brokerage accounts before putting your money to work in the stock market.

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