An S&P 500 ETF lets you own a slice of 500 of the largest US companies with one purchase. You buy one share, and that share holds tiny pieces of Apple, Microsoft, Amazon, and hundreds of other names. Many new investors start here because the idea is simple and the fees are low.
This guide walks through how an S&P 500 ETF works, what to expect from fees and returns, and how to buy one through a brokerage like Robinhood. The goal is to give you a clear picture before you put any money in.
What an S&P 500 ETF Actually Holds
The S&P 500 is a list of 500 large US companies put together by S&P Dow Jones Indices. An S&P 500 ETF tries to match that list, share for share, by holding the same stocks in the same weights.
The fund is run by a manager like Vanguard, BlackRock, or State Street. The manager buys the underlying shares and then sells small pieces of the fund to investors on the stock exchange. When you buy one share of the ETF, you get a fractional claim on every stock the fund owns.
How the 500 Companies Are Chosen
A committee at S&P Dow Jones Indices picks the companies. To make the list, a company usually needs to be based in the US, have a large market value, trade often, and show positive earnings. The committee can swap companies in and out a few times a year.
The biggest companies in the index get the biggest weight. So Apple and Microsoft can each make up several percent of the fund, while smaller members might be a fraction of one percent.
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How an ETF Trades on the Market
An ETF, or exchange-traded fund, trades on a stock exchange like a regular stock. You can buy or sell shares any time the market is open. The price moves all day based on supply, demand, and the value of the stocks inside the fund.
This is different from a mutual fund, which only prices once a day after the market closes. With an ETF, you see the price live and you place an order the same way you would for any stock.
Popular S&P 500 ETFs to Know
A handful of S&P 500 ETFs hold most of the money in this category. Here are the names you will see most often.
SPY
SPY, run by State Street, was the first US ETF and tracks the S&P 500. It is the most heavily traded fund in the country and is often used by short-term traders.
IVV
IVV is the iShares Core S&P 500 ETF from BlackRock. It has a very low expense ratio and is built more for long-term holders.
VOO
VOO is the Vanguard S&P 500 ETF. It is one of the lowest-cost options and has pulled in huge amounts of money from long-term investors.
SPLG
SPLG is the SPDR Portfolio S&P 500 ETF, also from State Street. It is similar to SPY but with a lower share price and a lower expense ratio.
All four track the same index, so their returns tend to look almost identical year to year. The main differences are the fees and the share price.
What These Funds Cost
ETFs charge an expense ratio. That is an annual fee taken out of the fund's assets, not a bill you pay each month. For most S&P 500 ETFs, the expense ratio is very low, often below 0.10 percent per year. On a 10,000 dollar position, that is around 10 dollars per year or less.
If you buy through a broker like Robinhood, there is usually no trading commission for US-listed stocks and ETFs. You may still pay tiny fees set by the SEC, but they are very small.
How Returns Usually Behave
The S&P 500 has had long stretches of growth, but it has also had hard drops, including in 2008 and early 2020. The index can fall 20 percent or more in a bad year. Over many decades, the index has trended up, but past performance is not a promise of future results.
An S&P 500 ETF does not protect you from those drops. It is built to match the index, both up and down. The fund is lower risk than picking a single stock because you are spread across 500 names, but it is not low risk in absolute terms.
Dividends and Taxes
Many of the 500 companies pay dividends. Your ETF collects those dividends and passes them to you, usually four times a year. You can take the cash or set the fund to reinvest it.
In a regular taxable account, dividends and any gains you lock in when you sell are taxable. In a Roth IRA or traditional IRA, the rules are different and may delay or remove some of that tax. A tax professional can help you sort out what fits your situation.
How to Buy an S&P 500 ETF
The process is the same as buying any stock.
- Open a brokerage account and fund it.
- Search for the ETF ticker, such as VOO, IVV, SPY, or SPLG.
- Choose how many shares or how much money you want to invest. Some brokers let you buy fractional shares.
- Place a market or limit order during market hours.
Many brokers, including Robinhood, also offer recurring investments. You set a fixed dollar amount on a schedule, and the broker buys for you. That is one way to build a position over time without trying to time the market.
Who an S&P 500 ETF Suits
These funds tend to fit investors who want broad US stock exposure, low fees, and a hands-off approach. They are often used as a core holding inside a larger plan that also includes bonds, international funds, or cash.
They may not fit someone who needs the money in the next year or two. Short time frames and stock market drops do not mix well. Talk with a financial advisor if you are not sure how much of your savings should sit in stock ETFs.
Frequently Asked Questions
Is an S&P 500 ETF the same as the S&P 500 index?
No, but it tracks it closely. The index is a list of 500 companies and weights. An ETF is a real fund that holds those stocks and trades on an exchange. Small tracking differences and fees can cause tiny gaps in performance.
How much money do I need to start?
You can start with the price of one share, often a few hundred dollars. Many brokers also offer fractional shares, so you can begin with as little as a few dollars and add more over time.
Are S&P 500 ETFs safe?
They are lower risk than holding a single stock because you own 500 names at once. They are not risk free. The index can fall sharply during recessions or market panics, and past returns do not guarantee future results.
Can I hold an S&P 500 ETF in a retirement account?
Yes. Most brokers let you hold these ETFs in a traditional IRA, Roth IRA, or 401(k) where the plan offers a brokerage window. Tax treatment depends on the account type, so check with a tax professional for your situation.
