The Nasdaq Composite tracks eligible domestic and international common-type stocks listed on Nasdaq using market-capitalization weights.
The Nasdaq Composite is a market-capitalization-weighted index of eligible domestic and international common-type stocks listed on the Nasdaq Stock Market. It is often associated with technology companies, but it is an exchange-based index with no technology-sector eligibility rule.
The index should not be confused with the Nasdaq Stock Market itself or with the Nasdaq-100, a narrower index of large non-financial Nasdaq-listed companies.
The Nasdaq Composite includes eligible common-type securities whose U.S. listing is exclusively on Nasdaq, subject to a limited grandfathering provision for certain continuously maintained dual listings that predate 2004.
Generally eligible security types include:
Generally ineligible types include closed-end funds, convertible debentures, exchange-traded funds, preferred stocks, rights, warrants, units, and other derivative securities. Multiple eligible share classes from one company can be included separately.
There is no industry or sector screen, no country screen, and no minimum market-capitalization or liquidity threshold stated in the current Composite methodology. A security generally must have traded for at least one day on Nasdaq and have a Nasdaq Official Closing Price.
The Nasdaq Composite uses security-level market-capitalization weights based on price and total shares outstanding. A simplified weight is:
where:
This is an important distinction from indexes that use float-adjusted market capitalization. Nasdaq’s methodology states that the Composite’s daily weights use total shares outstanding.
The published index level also uses an index divisor. The divisor scales aggregate constituent market value and is adjusted when membership, shares, or corporate actions would otherwise create a mechanical change unrelated to investment performance.
Assume a simplified three-security Composite:
| Security | Market capitalization used | Starting weight | Period return | Return contribution |
|---|---|---|---|---|
| A | $700 billion | 70% | 5.0% | 3.5 percentage points |
| B | $200 billion | 20% | -3.0% | -0.6 percentage point |
| C | $100 billion | 10% | 2.0% | 0.2 percentage point |
The simplified index return is approximately 3.1%:
Security A contributes more than the other two combined because of its much larger starting weight. A broad constituent count therefore does not imply balanced influence.
Nasdaq conducts the Composite’s reconstitution and rebalance daily using the previous trading day as the reference date, with changes effective at the next market open. Eligible securities are added, ineligible securities are removed, and total-share figures are updated through this process.
This daily schedule fits an all-eligible-listings index. A newly eligible company does not need to wait for an annual committee review, while a delisted or otherwise ineligible security does not remain merely to preserve a fixed count.
Daily maintenance does not mean that every constituent’s market price is reset. Market prices naturally change throughout the trading day; maintenance updates the index inputs and composition under the methodology.
The index has often carried a large technology weight because many highly valued technology companies list on Nasdaq. However:
Calling the Composite “the technology index” is useful shorthand only when accompanied by current sector-weight evidence. It is not an accurate methodology definition.
| Feature | Nasdaq Composite | Nasdaq-100 |
|---|---|---|
| Universe | All eligible common-type Nasdaq listings | Large eligible non-financial Nasdaq-listed companies |
| Constituent count | Variable | Fixed target associated with 100 companies, subject to methodology details |
| Company size | No minimum capitalization criterion in the Composite methodology | Large-company selection |
| Financial companies | Eligible if the security rules are met | Generally excluded |
| Main use | Broad measure of eligible Nasdaq listings | Large-company Nasdaq benchmark and product underlying |
An ETF described as “Nasdaq” may track the Nasdaq-100, not the Nasdaq Composite. The fund’s prospectus and factsheet should identify the exact index name and ticker.
| Index | Main universe | Weighting | Important boundary |
|---|---|---|---|
| Nasdaq Composite | Eligible domestic and international common-type Nasdaq listings | Market capitalization using total shares outstanding | Exchange-based; no sector requirement |
| S&P 500 | 500 selected U.S. large-cap companies | Float-adjusted market capitalization | Committee-selected and U.S.-domiciled |
| Dow Jones Industrial Average | 30 selected U.S. blue-chip companies | Share price | Narrow and price weighted |
| NYSE Composite | Eligible U.S. and non-U.S. NYSE-listed equities | Free-float-adjusted market capitalization | Defined by NYSE listing eligibility |
The S&P 500 and Nasdaq Composite can share large constituents, but weights and smaller-company coverage differ. A single company can influence each index differently because of the distinct universes and share-count conventions.
Nasdaq publishes multiple return versions of the Composite:
| Series | Dividend treatment | Interpretation |
|---|---|---|
| Price return | Excludes ordinary cash-dividend reinvestment | Produces the commonly quoted Composite level |
| Total return | Reinvests dividends under Nasdaq’s calculation rules | Combines price change and modeled income |
| Net total return | Applies methodology-based tax assumptions to reinvested dividends | A standardized after-withholding reference |
Always align return type, currency, and date when comparing an investment with the index. A fund’s reported return includes its own fees and implementation effects, while an index return does not represent an investor’s exact realized result.
The Nasdaq Composite can be used to:
It is not automatically the right benchmark for a technology fund, U.S.-only portfolio, large-cap mandate, or diversified total-market strategy. Benchmark choice should match the actual eligible universe and portfolio constraints.
Confusing the Composite with Nasdaq-100. They use different eligibility rules and represent different opportunity sets.
Calling every constituent a technology company. The index has no sector eligibility screen.
Assuming thousands of holdings guarantee diversification. Large-company and sector concentration can remain substantial.
Treating Nasdaq as a U.S.-domiciled-only benchmark. Eligible international common-type listings can be included.
Hard-coding the number of constituents. The index has a variable population maintained daily; current counts belong in dated factsheets, not permanent definitions.
This article provides general financial education. It is not personalized investment, trading, portfolio-construction, tax, or legal advice and does not recommend an index-linked product.