Nasdaq 100: Not a Technology Index

Michael Whitman · Trading since 2017, full-time since 2020 · Reviewed 2026-09-06

How it works

The rule is exchange, size and one exclusion. The hundred largest companies listed on the Nasdaq exchange, excluding financial companies, weighted by market value.

It is not the Nasdaq Composite. That index holds every company on the exchange — thousands of them, including a long tail of very small ones — and the two are quoted interchangeably in headlines despite behaving differently.

Nothing in the rule mentions technology. It contains retailers, drink manufacturers, biotechnology firms and transport companies, because the criterion is where a company listed rather than what it does.

What the weighting does

Size weighting produces the technology character. The largest Nasdaq-listed companies happen to be technology companies, so weighting by market value concentrates the index there regardless of the rule.

A small number of companies account for most of the movement. Holding a hundred names is not holding a hundred equal positions, and the daily move is largely a weighted average of the largest few.

A capping rule exists precisely because of that. When the largest holdings exceed defined thresholds the index is rebalanced to reduce them, which is an admission that pure size weighting produces a concentration the index provider is uncomfortable with.

It is more volatile than a broad market index. Fewer companies, one exchange, no financials and a concentrated top end all push in the same direction. That extra movement is not extra return — it is extra variability, and it needs a correspondingly smaller position.

In practice

Trackers for it are cheap and widely available. The competition among providers has pushed fees on major index products into single-digit basis points, which is a genuine improvement for holders.

Its futures carry enormous volume. That means tight spreads and deep liquidity for traders, and it is why the index appears constantly in day-trading material.

Over a decade the concentration explains most of the record. A period in which the largest technology companies did exceptionally well is a period in which this index did exceptionally well, and the two facts are the same fact.

Earnings season is concentrated risk. A gap in the whole index can come from one company’s results, which is single-stock risk arriving through an index position.

A stop in the futures offers no gap protection. The contract trades nearly around the clock, and the largest moves still arrive as jumps rather than as a slide through your level.

Trading costs apply as they do anywhere. 2% of a median bar’s range per round trip on this history, and the index’s larger swings do not reduce that share.

One structural feature separates it from every broad index and it is easy to miss: the exclusion of financial companies. Banks, insurers and asset managers are absent by rule, which removes an entire sector that behaves differently from the rest of the market — it tends to do well when interest rates rise, which is often when technology does badly.

So the index has no internal counterweight to its largest exposure. A broad market index holds banks alongside technology and the two partially offset; this one holds the technology and not the offset. That is the substantive reason it moves further in both directions, and it is a construction decision rather than a market condition.

What the Nasdaq 100 is not

It is not the Nasdaq Composite. Different index, different construction.

It is not a technology index by rule. It is one by weighting.

It is not diversified by holding count. A few names dominate.

And it is not a US market index. One exchange, no financials.

When it fails as a proxy

Using it as “the market” produces a distorted reading. No financial companies, one exchange and a concentrated top end make it a specific slice, and days when it diverges sharply from a broad index are days when the difference is the story.

A second failure is treating its record as evidence about indices generally. Its history is a history of one group of companies during one favourable period.

A third is holding it alongside a broad fund without checking. The overlap is substantial and the largest positions are the same ones.

A fourth is sizing it like a broad index. More volatility for the same money is more risk.

And a fifth is ignoring what the capping rule implies. An index that has to be rebalanced to limit its largest holdings is telling you something about its own construction.

The original data

Of the 31,760 trading and investing videos in this site’s corpus, 62 have “nasdaq” in the title at a median of 4,718 views across 42 channels. “S&P 500” returns 42 at a median of 9,664 across 32 channels, “dow jones” returns 6 at a median of 6,250, and “index fund” returns 30 at a median of 74,230. The counts are in research/corpus-coverage.json, produced by site/measure_corpus.py.

Sixty-two videos at a median of 4,718 views against thirty index-fund videos at 74,230 is the pattern worth noting. Twice as much material about trading this index reaches a sixteenth of the audience per video — the demand is for the boring long-term holding and the supply is concentrated on the exciting short-term instrument. Before buying it, look up the current top-ten weight, because that single figure tells you more about what you are holding than the name does.

Related

Index funds explains weighting and what a holding count really means. Nasdaq trading covers trading the index and its futures. And Dow Jones is the other headline index and its very different construction.

This page is educational, not financial advice. Test every idea on your own charts before risking money.