S&P 500 vs Nasdaq: what's inside each one, and how they move
People say "the market was up" and mean the S&P 500. Others mean the Nasdaq. They overlap a lot, but they're built differently, and that changes how each one moves.
The short answer
The S&P 500 is an Index of about 500 large US companies, picked by a committee at S&P Dow Jones Indices. It covers every major part of the economy: tech, health care, banks, energy, shops and more.
"The Nasdaq" can mean two things:
- The Nasdaq Composite: almost every stock listed on the Nasdaq exchange, a few thousand of them.
- The Nasdaq-100: the 100 largest companies on the Nasdaq exchange that aren't banks or other financial firms.
Both Nasdaq indexes lean heavily on technology. That's the big difference.
Side by side
| S&P 500 | Nasdaq-100 | Nasdaq Composite | |
|---|---|---|---|
| How many stocks | About 500 | About 100 | A few thousand |
| Who's in it | Large US companies, chosen by a committee | 100 largest non-financial Nasdaq listings | Nearly all Nasdaq listings |
| Exchanges | NYSE and Nasdaq | Nasdaq only | Nasdaq only |
| Includes banks? | Yes | No | Yes |
| Sector mix | Spread across the economy | Tech-heavy | Tech-heavy |
| Weighting | By company size (market cap) | By size, with caps on the biggest | By size |
| Common ETF | SPY, VOO, IVV | QQQ, QQQM | Fewer options |
| Futures | ES, MES | NQ, MNQ | Not the main contract |
Why the weighting matters
Both indexes are weighted by Market cap (company size). Bigger companies move the index more.
In plain words: a 1% move in one giant company can push the index more than a 10% move in a small one. When a handful of very large tech companies lead, the Nasdaq-100 feels it more, because they make up a bigger share of it.
That's why the two can drift apart on some days, even though many of the same companies are in both.
S&P 500: strengths and limits
The good parts:
- A wide view. It's the most common yardstick for "the US stock market".
- More balance. Banks, energy and health care can steady things when tech is weak.
- Lots of ways to follow it. ETFs, futures and options are all very active.
The limits:
- Still top-heavy. The largest companies carry a big share of the index.
- Committee picks. Membership follows rules, but people make the final call.
Nasdaq: strengths and limits
The good parts:
- A clear tech read. If you want to see how big tech and growth companies are doing, it shows that plainly.
- Active markets. The Nasdaq-100 has busy ETFs (QQQ) and futures (NQ).
The limits:
- Less spread out. Fewer sectors means one theme can swing it.
- Often moves more. Tech and growth stocks have tended to rise and fall harder than the broad market. That cuts both ways.
- Sensitive to rates. Growth companies are valued on future earnings, so interest-rate news tends to hit them more. See how interest rates affect stocks.
Neither index tells you what happens next. This page explains how each one is built and how it tends to move. It isn't a prediction or a recommendation to buy either one.
When they move differently
Some common patterns, described not predicted:
- Rate news days. A surprise on inflation or the Fed often moves the Nasdaq-100 further than the S&P 500. See CPI and FOMC days.
- Big tech earnings. A large tech company's results can shift the Nasdaq more.
- When banks or energy lead. The S&P 500 includes them, the Nasdaq-100 doesn't.
Which fits you?
- Want to follow the broad US market? The S&P 500 is the usual choice.
- Want a tech-focused view? The Nasdaq-100 shows that more directly.
- Planning to trade the futures? See ES vs NQ for how the contracts differ, and the futures tick value calculator for what each move is worth.
- Trading the ETFs? See SPY vs QQQ.
If one moves more, your stop needs more room and your size needs to be smaller to keep the same risk. The position size calculator does that math.
Common mistakes
- Mixing up the Composite and the Nasdaq-100. News often says "the Nasdaq" for the Composite. Futures and QQQ follow the Nasdaq-100.
- Thinking the S&P 500 has no tech. It has plenty. Many of the largest Nasdaq companies are in both.
- Using the same size on both. A more jumpy index needs a smaller size for the same risk.
- Reading one day as a trend. Check the bigger chart first. See how to identify a trend.
Questions
What is the difference between the S&P 500 and the Nasdaq?
The S&P 500 holds about 500 large US companies across all sectors. The Nasdaq Composite holds nearly every stock on the Nasdaq exchange, and the Nasdaq-100 holds its 100 largest non-financial companies. Both Nasdaq indexes lean on technology.
Is the Nasdaq more volatile than the S&P 500?
It has tended to be, because it leans on tech and growth companies, which often move more. That's a description of the past, not a promise about the future.
Are the same companies in the S&P 500 and the Nasdaq-100?
Many are. Large tech companies listed on Nasdaq often sit in both. The S&P 500 also includes companies from the NYSE and financial firms, which the Nasdaq-100 leaves out.
Which index does QQQ track?
QQQ tracks the Nasdaq-100, not the Nasdaq Composite. SPY tracks the S&P 500.
Want the next step? We'll walk you through it.
Four free lessons by email, one every few days — each with a 10-minute exercise on a real chart.
Send Me the Free Lessons 4 short emails · No spam · Unsubscribe anytimeOr see the whole method, step by step:
See What’s Inside the Course Try everything free first. Decide when you're ready. · Open the free chart tool (works in the TradingView phone app)One chart idea a day, in plain English. Follow along: