Semiconductor Stocks and the Nasdaq: Do Chips Lead NQ?

Why chips matter more than ever

On September 30, 2026, three chip companies were among the ten biggest members of the Nasdaq-100: Nvidia at 8.36%, Micron at 5.04% and AMD at 4.19%, for 17.59% combined, according to Nasdaq's official fact sheet for that date. Other chip makers and chip-equipment companies add to that further down the list. We cover the full top 10 in our article on Nasdaq-100 concentration.

A lot of NQ traders watch chip stocks as a "tell" for the index: if chips are strong, tech is strong. We tested how tight that relationship really is.

What we measured

We used the iShares Semiconductor ETF (SOXX), a liquid fund holding the biggest U.S.-listed chip companies, and QQQ for the Nasdaq-100. SOXX's history in our data starts in July 2001.

• Correlation: how closely weekly returns moved together.
• Beta of QQQ on SOXX: how much QQQ moved, on average, for each 1% move in SOXX.
• R²: the share of QQQ's weekly variation that SOXX's moves account for, statistically.
• Same direction: the share of weeks when both went up or both went down.
• Volatility ratio: SOXX's weekly volatility divided by QQQ's.

What we found

• 2001–20070.90
• 2008–20150.87
• 2016–20220.86
• 2023–20260.86
• Full period0.87

Exact values from table 2 in this article. Bar lengths share a zero baseline; no new calculation or simulated price path. Read the table and its stated sample and limits in this article.

A tight, stable link. Correlation stayed between 0.86 and 0.90 in every period. Week to week, SOXX's moves accounted for about three-quarters of the variation in QQQ.

But not one-for-one. For every 1% move in SOXX, QQQ moved about 0.6% on average. Chips were about one and a half times as volatile as the Nasdaq-100 over the full period.

Since 2023, chips got wilder. In 2023–2026, SOXX's volatility rose to 1.77 times QQQ's, the highest of any period, and QQQ's sensitivity dropped to 0.49. Correlation didn't change. The chip sector kept moving with the index, just with bigger swings around it. The AI cycle, with big moves in a few chip makers on every earnings report and product cycle, is one likely explanation, but our data can't isolate it.

Big chip weeks

We pulled out every week when SOXX rose or fell by 8% or more: 88 weeks since July 2001.

In every one of those weeks, the Nasdaq-100 moved the same way as chips. The median ratio of 0.61 means that in a week when SOXX fell 10%, a typical QQQ move was about −6%.

This describes the same week. It's not a forecast. It says big chip moves and big Nasdaq moves happen together. It doesn't say chips moved first.

Do chips lead the index?

That's the claim behind the "tell": that chips turn before the broader index. Our test doesn't answer it directly. It measures moves in the same week, and a lead of hours or days wouldn't show up in weekly data.

What it does show is narrower, but still useful:

1. Disagreement is common. In about one week in six, SOXX and QQQ went opposite ways. A strong chip week didn't guarantee a strong Nasdaq week unless the chip move was big.
2. Big moves are shared. Above 8%, there wasn't a single disagreement in 25 years.
3. The ratio is fairly stable. Around 0.6 in most periods, lower recently.

If you think chips lead NQ intraday, the right test uses intraday data with time stamps, and a fixed rule for what counts as a lead. Without that, a "tell" is a story told after the fact, a textbook case of hindsight bias.

Long-run returns

From July 27, 2001 to October 9, 2026, SOXX's price rose 2,186% and QQQ's 1,691%. Chips beat the index over the full period, with more volatility along the way. Both numbers leave out dividends, and the start date matters: QQQ's gain is way bigger here than from 1999 because this window starts after the 2000–2001 collapse was well underway.

A higher return with higher volatility isn't automatically a better trade. The real question for a trader is whether the extra volatility is a risk to manage or an opportunity to use.

What this means if you trade NQ

• Watch chips for size, not just direction. A big chip move has historically come with a same-direction Nasdaq move. A small one says a lot less.
• Scale your expectations. A rough rule from this data: the Nasdaq-100 moved about 0.5 to 0.6 times the chip move in the same week.
• Mark chip earnings on your calendar. With three chip makers in the top 10, their reports are events for NQ, not just for the sector.
• Don't assume a lead. Moving together in the same week isn't the same as chips moving first.

How to check it yourself

1. Plot SOXX and QQQ on the same weekly chart, or add the ratio SOXX/QQQ.
2. Mark every week SOXX moved 8% or more, and note QQQ's move that week.
3. Divide QQQ's move by SOXX's to get the ratio for each case.
4. For a lead test, do it again on intraday data with a rule locked in ahead of time.

Limits

• Weekly data. Moving together in the same week says nothing about intraday leads or lags.
• Overlap. Several chip companies are also Nasdaq-100 members, so part of the correlation is mechanical: the same stocks are in both.
• One ETF. SOXX's holdings and weighting rules differ from other chip indexes.
• Price only. Returns leave out dividends.

How we did it

• SOXX and QQQ weekly prices from Alpha Vantage (TIME_SERIES_WEEKLY). SOXX was adjusted by us for its three-for-one split in March 2024; QQQ data in this window all come after its 2000 split.
• Beta: slope of QQQ's weekly return on SOXX's. R²: square of the correlation.
• Big weeks: every week in which SOXX's price moved 8% or more in either direction.

Sources

• Nasdaq. (2026, September 30). Nasdaq-100 Index (NDX) fact sheet. indexes.nasdaqomx.com. Accessed October 12, 2026.
• Alpha Vantage. TIME_SERIES_WEEKLY (SOXX, QQQ). Data retrieved October 2026.

FAQ

What's the correlation between semiconductors and the Nasdaq-100? About 0.87 on weekly data from 2001 to 2026, using SOXX and QQQ.

Do chip stocks lead the Nasdaq? Our weekly data can't show a lead. In the same week, big chip moves always came with same-direction Nasdaq moves.

How much does the Nasdaq-100 move when semiconductors move? About 0.6% for each 1% move in SOXX on average, and about 0.5% since 2023.

Are semiconductors more volatile than the Nasdaq-100? Yes. About 1.5 times as volatile over 2001–2026, and 1.77 times since 2023.

How much of the Nasdaq-100 is semiconductors? Nvidia, Micron and AMD alone weighed 17.59% on September 30, 2026. Other chip companies add to that.

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Research and education only. Not financial advice. Past results do not predict future returns.

How this article was made: drafted with AI assistance from public data and the sources listed above; facts and figures checked by Gabriel Décarie and Karel Panneton.