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SPY ETF explained: the S&P 500 you can trade like a stock

SPY lets you buy the whole S&P 500 with one ticker, in any brokerage account. It's one of the most traded securities in the world, and it's been around since 1993.

Market guide · 6-minute read · Updated 2026-10-21

At a glance

SPY is part of State Street's SPDR fund family. It launched in January 1993 and is widely known as the first US-listed ETF.

This page explains how SPY tends to move. It isn't a recommendation to buy or sell it.

How it works

An ETF is a fund that trades on an exchange like a single stock. SPY owns the stocks of the S&P 500. When the index rises 1%, SPY's price rises about 1%, minus a small yearly fee.

Its price is roughly one tenth of the S&P 500's level. That's a design choice from launch, not a rule you can rely on to the cent.

It also pays out the Dividends its stocks pay, every quarter.

What moves it

The same things that move the S&P 500:

• The Fed. FOMC statements at 2:00 pm ET, press conference at 2:30 pm.
• Inflation and jobs. CPI and the jobs report at 8:30 am ET, before the open. SPY reacts in pre-market at many brokers.
• Earnings. Reports from the biggest members, usually after 4:00 pm ET, show up in after-hours trading and in the next open.
• Bond yields. See how interest rates affect stocks.

When it's busiest

• 9:30 – 10:30 am ET: the open, with the most volume and the widest swings.
• Midday: often slower.
• 3:00 – 4:00 pm ET: heavy volume as funds trade into the close.
• Pre-market and after-hours: thin trading and wider spreads. See Pre-market and after-hours.

US hours in ET stay the same all year.

Its personality

• Extremely liquid. Huge daily volume keeps the Spread tiny during regular hours.
• Smooth, for a stock. It moves like the whole S&P 500, not like one company.
• A busy options market. SPY options trade with expiries on every weekday, which brings a lot of activity near the close.
• Gaps at the open. News that lands overnight shows up as a jump at 9:30 am.

SPY vs ES futures

Neither is "better". They suit different accounts and plans. See futures vs stocks.

Reading it with our method

Mark the last places price turned around on the daily chart and decide the direction. Then only take trades in that direction on your smaller chart.

A level only breaks when a candle body closes past it. A tail through yesterday's low at 9:31 am doesn't count.

Then size from the stop. Example: your account is 10,000 units and you risk 1%, so 100 units. Your stop is 2.00 below your entry. 100 ÷ 2 = 50 shares. A math example, not a promise. The position size calculator does it for you.

Common mistakes

• Buying a round number of shares. Size comes from the stop, not from "100 feels right".
• Trading thin extended hours like regular hours. Spreads widen and prices can jump.
• Forgetting the gap. A stop can't protect you from an overnight jump.
• Confusing the fund with the index. SPY's price isn't exactly a tenth of the S&P 500, and the gap shifts slowly.

Questions