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SPY vs QQQ: what each ETF holds, and how they differ

SPY and QQQ are two of the most traded funds in the world. One follows the broad US market. The other leans on big tech. Same idea, different basket.

Comparison · 6-minute read · Updated 2026-10-21

The short answer

SPY (the SPDR S&P 500 ETF Trust) is an ETF that tracks the S&P 500: about 500 large US companies across the whole economy. It launched in January 1993 and is run by State Street.

QQQ (the Invesco QQQ Trust) is an ETF that tracks the Nasdaq-100: the 100 largest non-financial companies on the Nasdaq exchange. It launched in March 1999. It leans heavily on technology.

Both trade like a stock. You can buy or sell them any time the market is open.

Side by side

Fees change. Check each fund's own page for the current yearly cost (the expense ratio).

What's actually different

Both are weighted by company size, so the biggest companies matter most. Many of the largest companies are in both funds.

The key differences:

• Breadth. SPY holds five times as many companies. That includes banks, energy, factories and health care.
• Tech share. QQQ's top holdings are mostly tech and tech-like companies, so they make up a bigger share of the fund.
• Movement. Because of that tilt, QQQ has tended to rise and fall more than SPY. That's a pattern from the past, not a promise.

See S&P 500 vs Nasdaq for how the two indexes are built.

SPY: strengths and limits

The good parts:

• Huge trading volume. Very tight spread between buy and sell prices during market hours.
• Broad. One fund covers most of the large-company US market.
• Very active options. Many expiry dates to choose from.

The limits:

• Not the cheapest way to hold the S&P 500. For long-term holders, sister funds like VOO or IVV often charge less. SPY's edge is its trading activity.
• Still top-heavy. The largest companies carry a big share.

QQQ: strengths and limits

The good parts:

• A direct tech read. It shows how big tech and growth companies are doing.
• Very liquid. Busy trading and tight spreads.

The limits:

• Less spread out. One theme can drive it.
• Bigger swings. Moves in tech can push it harder in both directions.
• Rate-sensitive. Growth companies often react more to interest-rate news. See how interest rates affect stocks.

A simple example

Say you risk 1% of a 10,000-unit account: 100 units.

• On SPY, your chart says the stop goes 2 dollars below entry. 100 ÷ 2 = 50 shares.
• On QQQ, the same kind of level puts the stop 4 dollars away. 100 ÷ 4 = 25 shares.

Same risk, different size. A math example, not a promise. Losses can still happen on either one.

Which fits you?

1. Want one fund that follows the broad US market? SPY (or a cheaper S&P 500 sibling) fits that job.
2. Want a tech-focused fund? QQQ fits that job, with bigger swings to plan for.
3. Day trading? Both are very liquid. Many traders pick one and learn its rhythm instead of switching. See day trading for beginners.
4. Long-term holding? Compare yearly fees and how much spread across sectors you want. See stocks vs ETFs.

Common mistakes

• Thinking QQQ tracks "the whole Nasdaq". It tracks the Nasdaq-100 only.
• Holding both and calling it spread out. They share many top companies, so they often move together.
• Same size on both. Plan the stop from the chart and size from it.
• Trading the first minutes after 9:30 am ET without a plan. Prices jump and spreads can widen at the open.

Questions