The S&P 500 and Nasdaq-100 are both capitalization-weighted stock indexes, but they represent different slices of the market. The S&P 500 is a broad U.S. large-company benchmark spanning industries; the Nasdaq-100 selects large, eligible nonfinancial companies listed on the Nasdaq exchange. That exchange-listing rule and the exclusion of financial companies make the Nasdaq-100 narrower than the S&P 500, not simply a smaller list of the same stocks.
Their construction also differs: the S&P 500 uses float-adjusted market-cap weighting, while the Nasdaq-100 uses modified market-cap weighting with concentration controls. Those choices affect which companies can be included and how much influence their share-price movements have on the index.
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What the S&P 500 includes
The S&P 500 contains 500 leading companies and is designed as a broad gauge of large-cap U.S. equities. S&P Dow Jones Indices says it covers approximately 80% of available U.S. market capitalization. The index spans industries rather than limiting membership to companies listed on one exchange or to a single sector.
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Membership is selected, not just sorted
The S&P 500 is not simply the 500 largest stocks ranked by market value. The SEC describes it as a capitalization-weighted representative sample of leading companies in leading U.S. industries, with selection considering market size, liquidity, and industry-group representation. S&P’s published U.S. index methodology sets out eligibility and selection rules, with committee-based selection. As a result, passing one size test alone does not guarantee inclusion.
This distinction matters when interpreting the number 500. It is the index’s company count, not a promise that the 500 companies with the highest headline market capitalizations automatically qualify. The index provider’s selection process operates within published eligibility rules and considers how the index represents industries. A company’s size is relevant, but it is not the only consideration named in the SEC’s description.
Eligibility thresholds and membership can change. A company’s presence in the index today should not be treated as a permanent guarantee, and a threshold quoted for one point in time should not be assumed to remain in force. For an up-to-date constituent list or rule, consult the index provider’s current materials. The S&P overview and constituent information are time-sensitive, so a comparison should identify the date of any membership or weight figures it uses.
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What float-adjusted weighting means
The S&P 500 weights companies by market capitalization adjusted for the shares considered available to public investors, rather than by assigning every company an equal share of the index. In practical terms, a larger float-adjusted company has more influence on the benchmark’s value than a smaller one. The adjustment means the weighting is not based simply on every share a company has issued.
This is a market-cap-weighted benchmark, not an equal-weighted basket. The count of 500 constituents tells you how many companies are included; it does not mean each company contributes one five-hundredth of the index’s movement. When comparing index performance, a company’s presence and its weight are separate questions: membership tells you that it is included, while weighting affects how strongly its price movement can influence the aggregate.
What the Nasdaq-100 includes
The Nasdaq-100 measures the performance of 100 of the largest eligible nonfinancial companies listed on the Nasdaq exchange. Nasdaq’s methodology effective May 1, 2026 describes its weighting as modified market capitalization. The SEC likewise characterizes it as a modified-capitalization-weighted index of large, actively traded domestic and international nonfinancial securities listed on Nasdaq.
The SEC’s description includes domestic and international securities, so “Nasdaq-100” should not be read as a guarantee that every constituent is a U.S.-based company. The defining screen described here is that eligible companies are listed on Nasdaq and are nonfinancial. It is a large-company benchmark with a defined exchange universe, not a general index of all businesses that might be described as American or technology-focused.
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Exchange listing and financial exclusion shape the universe
For this index, “Nasdaq” identifies the exchange universe from which eligible companies are selected. It does not mean the index represents every U.S. technology company, every company in a particular sector, or the entire U.S. stock market. A company’s industry alone does not determine eligibility: it must satisfy the index’s rules, including the Nasdaq listing requirement and nonfinancial-company screen.
Financial companies are excluded by design. Nasdaq’s educational explanation also describes eligibility seasoning and trading-volume requirements, low-float adjustments, and concentration constraints. Those details matter because the index is not just a snapshot of the 100 biggest names by headline market value; its rules govern eligibility and the effect of company size on index weight.
“Seasoning” and trading volume are eligibility considerations, while low-float adjustments and concentration controls relate to how the index is constructed and weighted. These are not interchangeable with the S&P 500’s stated selection considerations. Nor should a reader assume that a concentration control makes the index equal-weighted: Nasdaq describes the method as modified market capitalization, and the index remains capitalization-based. The precise rules are set out in Nasdaq’s methodology, which is effective May 1, 2026; consult the current methodology for detailed thresholds or later changes.
Nasdaq-100 is not the Nasdaq Composite
The Nasdaq-100 and Nasdaq Composite are different benchmarks. The Nasdaq-100 is a 100-company large-company index with a nonfinancial screen. Nasdaq describes the Composite as covering a much wider set of securities listed on Nasdaq. A reference to “the Nasdaq” may therefore be ambiguous: check whether a comparison means the Nasdaq-100, the Nasdaq Composite, or the exchange itself.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThis naming distinction is a practical comparison pitfall. A statement about the Nasdaq-100 should not automatically be applied to the Composite, because they cover different sets of securities. If a fund, article, or performance chart uses a shortened label such as “Nasdaq,” verify the specific benchmark before comparing it with the S&P 500.
How the two indexes differ
| Feature | S&P 500 | Nasdaq-100 |
|---|---|---|
| Eligible universe | Leading large-cap U.S. companies across industries; selection considers factors including size, liquidity, and industry representation. | Largest eligible nonfinancial companies listed on Nasdaq. |
| Number of companies | 500 | 100 |
| Weighting | Float-adjusted market capitalization | Modified market capitalization, with concentration controls described in Nasdaq’s methodology and educational materials. |
| Financial companies | Can be included when eligible. | Excluded by design. |
| Market coverage | Broad large-cap U.S. equity benchmark, covering approximately 80% of available market capitalization according to S&P Dow Jones Indices. | Narrower exchange-defined large-company benchmark. |
| Useful shorthand | A broad gauge of large U.S. companies across industries. | A benchmark for large Nasdaq-listed nonfinancial companies. |
The figures and descriptions in this table reflect the index providers’ stated definitions and the SEC’s descriptions. They are not a list of current constituents or current constituent weights, which can change over time. The table also compares index design, not particular funds that track the indexes; products following the same benchmark can have different features.
Why the indexes can move differently
They do not start with the same pool of companies. The S&P 500’s cross-industry U.S. large-company remit and the Nasdaq-100’s Nasdaq-listing rule and financial exclusion produce different memberships. Their weighting methods also differ. Because both are capitalization-based, larger companies can exert more influence than smaller ones; the Nasdaq-100’s modified weighting and concentration controls adjust that influence under its rules.
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It follows that the indexes can react differently when the companies they include have different share-price performance. A difference between the indexes does not, by itself, identify a single cause: membership, weighting, and the period being measured all matter. Nor does the name of an index establish that it is a pure technology-sector measure; the Nasdaq-100 is defined by its eligibility rules, not by a technology-only label.
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These construction differences also explain why comparing only constituent counts can mislead. One index has 500 companies and the other 100, but the count alone does not say how broad the eligible universe is, what industries are excluded, or how much influence any individual company has. For a useful comparison, look at the eligible universe, the selection rules, the weighting approach, and the period measured together.
Historical returns and volatility: keep the dates attached
Nasdaq Global Indexes compared the indexes from December 31, 2007 through June 30, 2026, using Nasdaq Global Indexes and FactSet as data sources. The provider reported the following figures for that historical window:
| Measure | Nasdaq-100 | S&P 500 |
|---|---|---|
| Cumulative total return, Dec. 31, 2007–June 30, 2026 | 1,635% | 627% |
| Annualized return, same period | 16.7% | 11.3% |
| Annualized volatility, same period | 22.9% | 19.9% |
| Calendar years in which Nasdaq-100 exceeded S&P 500, 2008–June 2026 reporting period | 14 of 18 calendar years | |
| Daily-return correlation over the stated 18-year period | 93% | |
These are figures from Nasdaq Global Indexes’ comparison, not an independent evaluation. The cumulative and annualized returns describe index performance over the specified window; they are not a forecast or a promise that the same relative result will recur. Volatility is a measure of how much returns varied over that period, not a prediction of future losses or gains. The reported 93% correlation indicates that daily returns moved closely together over the stated period, but correlation does not mean the indexes are identical or that their returns will match.
The return measures answer different questions. Cumulative total return describes the combined change across the full stated period, while annualized return expresses the period’s result as an annual rate. Neither figure says that the indexes delivered the same return in every year. Nasdaq-100 exceeded the S&P 500 in 14 of the 18 calendar years in the report’s 2008–June 2026 period, meaning there were also calendar years in that reporting period when it did not. The annualized volatility figures describe historical variation, not a ranking of which index is safer in the future.
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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →The comparison is especially easy to misread if the dates are omitted. A return figure is meaningful only alongside its start and end dates and its measurement type. The Nasdaq Global Indexes comparison ends June 30, 2026; it should not be presented as a current-year figure or as evidence about performance after that date. Nasdaq Global Indexes identifies itself and FactSet as data sources for the stated comparison.
Index returns are not the same as an individual investor’s realized return. A person’s result can differ because of purchase and sale timing, taxes, fund expenses, fund tracking differences, and the particular investment product used. The comparison therefore answers what happened in that historical window; it does not establish which index will perform better next. It also does not establish that a fund tracking the index would have delivered the same result net of product costs or tracking effects.
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How to compare them for your decision
Start with what each benchmark represents, not with the winner in a past return table. The relevant question is whether you want a broad large-cap U.S. market reference or a more restricted benchmark tied to Nasdaq-listed nonfinancial companies. Then assess how the index’s construction affects the exposure you intend to measure.
- Check the universe. Determine whether the comparison is about leading U.S. large-cap companies across industries or eligible large companies listed on Nasdaq. Confirm that the Nasdaq-100’s financial-company exclusion fits the question you are asking.
- Check selection and count. The S&P 500 has 500 companies and committee-based selection under published rules; the Nasdaq-100 has 100 and includes Nasdaq eligibility requirements. Do not treat either as an unchanging roster based only on a past constituent list.
- Check the weighting method. The S&P 500 uses float-adjusted market-cap weighting. The Nasdaq-100 uses modified market-cap weighting with concentration controls. If you are comparing index movements, a company’s weight matters as well as whether it appears in the index.
- Compare the same dates and return measure. Historical performance comparisons should use the same start and end dates and should clarify whether the figures are cumulative or annualized. Keep volatility and correlation separate from return: each describes a different feature of the period.
- If buying exposure, evaluate the fund separately. An index is a benchmark, not a security that an investor buys directly. A fund or other financial product may seek to track it. Compare that product’s expenses, structure, tracking, tax considerations, and availability for your circumstances; the index’s past performance does not settle whether a particular fund is appropriate.
A practical checklist for a fund comparison is to first confirm the benchmark named in the product documents, then review the fund’s structure and expenses, and then consider tracking and tax implications in light of your own circumstances. The limits of the details presented here are that they do not establish current fees, product availability, or the suitability of a particular fund, so do not infer those details from the index name. Product-level details should be checked directly rather than assumed from the index provider’s historical return table.
Nasdaq says QQQ, QQQM, and most Nasdaq-branded investment products are linked to the Nasdaq-100. S&P Dow Jones Indices also lists index-linked products. These are examples of ways financial products may be associated with the benchmarks, not a recommendation to buy them and not a complete comparison of their costs or features. An investor purchases a product, not the index itself.
What the index comparison does—and does not—tell you
The index definitions can tell you which companies are eligible in broad terms, how many constituents each benchmark contains, and how the weighting approaches differ. They also help explain why two large-company indexes can show different results even though their daily returns were highly correlated over a particular historical window.
They do not determine whether either benchmark is suitable for a particular investor, predict returns, or provide a complete comparison of funds. Fund-level questions require the details of the actual product, including its costs and tracking behavior. Those details are distinct from index rules and were not established by the index comparison above.
The SEC’s investor education page cautions: “The SEC does not regulate the content of these indices and is not endorsing those described here.” The SEC’s descriptions help explain what the benchmarks are; they should not be read as a regulatory approval or investment recommendation.
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Frequently Asked Questions
Do the S&P 500 and Nasdaq-100 represent the same market?
No. The S&P 500 is a broad benchmark of leading U.S. large-cap companies across industries and covers approximately 80% of available market capitalization, according to S&P Dow Jones Indices. The Nasdaq-100 selects eligible nonfinancial companies listed on Nasdaq, so its universe is narrower and exchange-defined.
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Is the Nasdaq-100 a technology index?
Not by its formal definition. Nasdaq-100 eligibility is based on Nasdaq listing and nonfinancial status, along with index rules; it is not defined as a technology-only index. Its name should not be treated as a sector label.
What is the difference between Nasdaq-100 and Nasdaq Composite?
The Nasdaq-100 contains 100 of the largest eligible nonfinancial Nasdaq-listed companies. Nasdaq describes the Nasdaq Composite as covering a much wider set of securities listed on Nasdaq. Check the specific benchmark whenever a source uses the shortened word “Nasdaq.”
Which index performed better historically?
In Nasdaq Global Indexes’ comparison from December 31, 2007 through June 30, 2026, the Nasdaq-100 had a 1,635% cumulative total return and a 16.7% annualized return, compared with 627% and 11.3% for the S&P 500. The same comparison reported higher annualized volatility for the Nasdaq-100, 22.9% versus 19.9%. These are historical index figures, not forecasts or investor returns after costs and taxes.
Can I buy the S&P 500 or Nasdaq-100 directly?
An index is a benchmark, not a security purchased directly. Funds and other financial products may seek to track an index. Nasdaq says QQQ, QQQM, and most Nasdaq-branded investment products are linked to the Nasdaq-100, while S&P Dow Jones Indices lists S&P 500-linked products. Compare any specific product’s costs, structure, tracking, taxes, and availability separately.
Does the SEC endorse either index?
No. The SEC’s investor education page says it does not regulate the content of these indices and is not endorsing those described there. Its descriptions are informational, not an investment recommendation.
The Bottom Line
The S&P 500 is a broad, cross-industry U.S. large-cap benchmark of 500 selected companies; the Nasdaq-100 is a 100-company index limited to eligible nonfinancial Nasdaq-listed businesses. Their universes and weighting rules differ, so they can behave differently. Historical results through June 30, 2026 favor the Nasdaq-100 in Nasdaq Global Indexes’ comparison, but that dated record is not a forecast or a reason by itself to choose a fund.
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